Efficacy and safety of a transdermal contraceptive system

Randomized, double-blind, two-way crossover bioequivalence and adhesion study, in healthy women, of a transdermal contraceptive patch with a newly sourced adhesive component at the end of shelf life vs. the EVRA patch at the beginning of shelf life

OBJECTIVE

Evaluate bioequivalence, based on norelgestromin (NGMN) and ethinyl estradiol (EE) plasma concentrations, and adhesion of a transdermal contraceptive patch containing a newly sourced adhesive component (test) at end of shelf life (EOSL) vs. the marketed EVRA patch (reference) at beginning of shelf life (BOSL).

MATERIALS AND METHODS

In this randomized, double-blind, two-way crossover study, healthy women received a single, 7-day application of test and reference patches in 4 sequences: two 11-day treatment periods separated by a 21-day washout. Assessments included NGMN and EE pharmacokinetics (PK), adhesion (per European Medicines Agency (EMA) 5-point scale), irritation potential and application-site reactions, and tolerability. Patches were bioequivalent if 90% CIs of geometric mean ratios (GMRs) of test/reference for Cmax, AUC168h, AUC0-tlast, and AUC∞ were 80 - 125%. Patch adhesion was comparable if ratios of geometric mean cumulative adhesion percentages were ≥ 90%.

RESULTS

68 women were randomized, and 62 completed both treatments. 55 and 59 participants in the reference and test group, respectively, had patch adhesion ≥ 80% (EMA score 0 - 1) at end of treatment. Bioequivalence was demonstrated: GMRs for pharmacokinetic (PK) parameters ranged from 102.76 - 105.57% for NGMN and 93.78 - 94.80% for EE, and associated 90% CIs were fully within the bioequivalence acceptance range (80 - 125%) for both. The patches had comparable adhesion properties (GMR, 101.4% (90% CI: 99.2 - 103.6)) and incidences of treatment-emergent adverse events.

CONCLUSION

NGMN-EE transdermal test patch at EOSL was bioequivalent to the marketed patch at BOSL, supporting widening the product's shelf-life specification. Adhesive properties and safety profiles were comparable between patches.

Transdermal delivery of combined hormonal contraception: a review of the current literature

The transdermal patch provides an effective and convenient option for hormonal contraception. The patch currently on the US market contains 150 µg norelgestromin and 35 µg ethinylestradiol (EE). The 20 cm² patch is applied once weekly for 3 weeks, followed by a patch-free week, for a 21–7 cycle. Typical failure rates are similar to that of combined oral contraceptives (COCs). Transdermal delivery results in less peaks and troughs of estrogen, but a higher total estrogen exposure compared with COCs. Though studies show mixed results, the risk of developing venous thromboembolism (VTE) is about twice as high with the patch as with COCs; however, the absolute risk of VTE remains low. The side effect profile is similar to that of COCs, with slightly higher rates of breast tenderness plus a unique adverse effect of application site reactions. Two new patches have been developed, one containing gestodene and EE in Europe and another containing levonorgestrel and EE. Overall, the patch provides an alternative to COCs for women who want autonomy and the benefit of not needing to take a pill daily, with similar efficacy and tolerability.

Impact of body mass index on suppression of follicular development and ovulation using a transdermal patch containing 0.55-mg ethinyl estradiol/2.1-mg gestodene: a multicenter, open-label, uncontrolled study over three treatment cycles

BACKGROUND

Body mass index (BMI) may influence ovulation inhibition resulting from transdermal hormone delivery. Investigation of this effect is important given the high prevalence of obesity in the US.

STUDY DESIGN

This open-label, uncontrolled, Phase 2b trial stratified 173 women (18-35 years) according to three BMI groups (Group 1, n = 56, ≤ 30 kg/m²; Group 2, n = 55, > 30 kg/m² and ≤ 35 kg/m²; and Group 3, n = 47, > 35 kg/m²). Women used a contraceptive patch containing 0.55-mg ethinyl estradiol (EE) and 2.1-mg gestodene (GSD). The EE/GSD patch was used weekly for three 28-day cycles (one patch per week for 3 consecutive weeks followed by a 7-day, patch-free interval), and its effect on ovulation was assessed by the Hoogland score, a composite score that comprises transvaginal ultrasound and estradiol (E₂) and progesterone levels every 3 days in Cycles 2 and 3. Evaluation of pharmacokinetic parameters was a secondary aim of the study, and blood samples for analytic determination of EE, GSD and sex hormone-binding globulin were taken during the pretreatment cycle, Cycle 2 and Cycle 3. Compliance was assessed using diary information and serum drug levels.

RESULTS

In the per-protocol set, there were only six ovulations during the study, and no participant ovulated in both study cycles. One ovulation occurred in Group 1, three in Group 2 and two in Group 3. Ovulation inhibition was unaffected by BMI; in all groups, most participants had Hoogland scores of 1 or 2 (i.e., follicle-like structures < 13 mm: Group 1, ≤ 30 kg/m², 80.0% in Cycle 2, 85.7% in Cycle 3; Group 2, > 30 kg/m² and ≤ 35 kg/m², 61.4% in Cycle 2, 75.0% in Cycle 3; Group 3, > 35 kg/m², 78.0% in Cycle 2, 72.5% in Cycle 3). Serum levels of follicle-stimulating hormone, luteinizing hormone, E2 and progesterone were similar between groups. Body weight had a limited effect on EE clearance that was unlikely to be clinically relevant.

CONCLUSION

The EE/GSD patch provided effective ovulation inhibition, even in women with higher BMI.

IMPLICATIONS

This is the largest-to-date study of physiologic endpoints and found no clinically important differences in ovarian suppression among obese and normal-weight users of the EE/GSD contraceptive patch, thus providing reassurance that obese women can achieve the same high level of contraceptive protection as normal-weight users.

Metabolic effects of the contraceptive skin patch and subdermal contraceptive implant in Mexican women: a prospective study

Background

The contraceptive skin patch (CSP) accepted by the U.S. FDA in 2001 includes ethinylestradiol and norelgestromine, whereas the subdermal contraceptive implant (SCI) has etonogestrel and is also approved by the FDA. In Mexico, both are now widely used for contraception but their effects on Mexican population are unknown. The objective of the study was to evaluate if these treatments induce metabolic changes in a sample of indigenous and mestizo Mexican women.

Methods

An observational, prospective, longitudinal, non-randomized study of women between 18 and 35 years of age assigned to CSP or SCI. We performed several laboratory tests: clinical chemistry, lipid profile, and liver and thyroid function tests. Also, serum levels of insulin, C-peptide, IGF-1, leptin, adiponectin, and C reactive protein were assayed.

Results

Sixty-two women were enrolled, 25 used CSP (0 indigenous; 25 mestizos) and 37 used SCI (18 indigenous; 19 mestizos). Clinical symptoms were relatively more frequent in the SCI group. Thirty-four contraceptive users gained weight without other clinical significant changes. After 4 months of treatment, significant changes were found in some biochemical parameters in both treatment groups. Most were clinically irrelevant. Interestingly, the percentage of users with an abnormal atherogenic index diminished from 75% to 41.6% after follow-up.

Conclusions

The CSP slightly modified the metabolic variables. Most changes were nonsignificant, whereas for SCI users changes were more evident and perhaps beneficial. Results of this attempt to evaluate the effects of contraceptives in mestizo and native-American populations show that clinical symptoms are frequent in Mexican users of CSP and SCI. Although these medications may affect some metabolic variables, these changes seem clinically irrelevant. Induction of abnormalities in other physiological pathways cannot be ruled out.

[The postnatal contraception: upon 600 patients of whom 129 were postnatal controlled]

OBJECTIVE

To draw a parallel between the contraceptive methods prescribed in the post-natal ward and the contraceptive methods taken by patients during their postnatal visit.

PATIENTS AND METHODS

This piece of work draws information from a prospective 10 weeks study at a University Teaching Hospital post-natal ward on the contraception that is prescribed upon leaving the maternity ward and also at the time of the post-natal visit.

RESULTS

From the 600 cases studied, the analysis is about 129 patients reviewed in the post-natal visit. The percentage of loss was 78.5%. A hormonal contraceptive pill was prescribed to 73.5% of women (441 patients) after birth in which 63.5% had microprogestative pills. At the earliest, the IUD was given at about 5.4 weeks postpartum. At the time of the postnatal visit, compliance was bad for one third of women with either estrogen plus progestin methods, microprogestative or natural methods. Women who chose a barrier method were only 45.5% to follow this choice, the others left without contraception.

DISCUSSION AND CONCLUSION

The prescription of postpartum contraception was followed by only 66.6% of women. In order to prescribe a more effective contraceptive method, we must improve the prescriber's timing in sharing contraceptive information and completeness of the contraceptive methods offered.

Skin patch and vaginal ring versus combined oral contraceptives for contraception

BACKGROUND

The delivery of combination contraceptive steroids from a transdermal contraceptive patch or a contraceptive vaginal ring offers potential advantages over the traditional oral route. The transdermal patch and vaginal ring could require a lower dose due to increased bioavailability and improved user compliance.

OBJECTIVES

To compare the contraceptive effectiveness, cycle control, compliance (adherence), and safety of the contraceptive patch or the vaginal ring versus combination oral contraceptives (COCs).

SEARCH METHODS

Through February 2013, we searched MEDLINE, POPLINE, CENTRAL, LILACS, ClinicalTrials.gov, and ICTRP for trials of the contraceptive patch or the vaginal ring. Earlier searches also included EMBASE. For the initial review, we contacted known researchers and manufacturers to identify other trials.

SELECTION CRITERIA

We considered randomized controlled trials comparing a transdermal contraceptive patch or a contraceptive vaginal ring with a COC.

DATA COLLECTION AND ANALYSIS

Data were abstracted by two authors and entered into RevMan. For dichotomous variables, the Peto odds ratio (OR) with 95% confidence intervals (CI) was calculated. For continuous variables, the mean difference was computed. We also assessed the quality of evidence for this review.

MAIN RESULTS

We found 18 trials that met our inclusion criteria. Of six patch studies, five examined the marketed patch containing norelgestromin plus ethinyl estradiol (EE); one studied a patch in development that contains levonorgestrel (LNG) plus EE. Of 12 vaginal ring trials, 11 examined the same marketing ring containing etonogestrel plus EE; one studied a ring being developed that contains nesterone plus EE.Contraceptive effectiveness was not significantly different for the patch or ring versus the comparison COC. Compliance data were limited. Patch users showed better compliance than COC users in three trials. For the norelgestromin plus EE patch, ORs were 2.05 (95% CI 1.83 to 2.29) and 2.76 (95% CI 2.35 to 3.24). In the levonorgestrel plus EE patch report, patch users were less likely to have missed days of therapy (OR 0.36; 95% CI 0.25 to 0.51). Of four vaginal ring trials, one found ring users had more noncompliance (OR 3.99; 95% CI 1.87 to 8.52), while another showed more compliance with the regimen (OR 1.67; 95% CI 1.04 to 2.68).More patch users discontinued early than COC users. ORs from two meta-analyses were 1.59 (95% CI 1.26 to 2.00) and 1.56 (95% CI 1.18 to 2.06) and another trial showed OR 2.57 (95% CI 0.99 to 6.64). Patch users also had more discontinuation due to adverse events than COC users. Users of the norelgestromin-containing patch reported more breast discomfort, dysmenorrhea, nausea, and vomiting. In the levonorgestrel-containing patch trial, patch users reported less vomiting, headaches, and fatigue.Of 11 ring trials with discontinuation data, two showed the ring group discontinued less than the COC group: OR 0.32 (95% CI 0.16 to 0.66) and OR 0.52 (95% CI 0.31 to 0.88). Ring users were less likely to discontinue due to adverse events in one study (OR 0.32; 95% CI 0.15 to 0.70). Compared to the COC users, ring users had more vaginitis and leukorrhea but less vaginal dryness. Ring users also reported less nausea, acne, irritability, depression, and emotional lability than COC users.For cycle control, only one trial study showed a significant difference. Women in the patch group were less likely to have breakthrough bleeding and spotting. Seven ring studies had bleeding data; four trials showed the ring group generally had better cycle control than the COC group.

AUTHORS' CONCLUSIONS

Effectiveness was not significantly different for the methods compared. Pregnancy data were available from half of the patch trials but two-thirds of ring trials. The patch could lead to more discontinuation than the COC. The patch group had better compliance than the COC group. Compliance data came from half of the patch studies and one-third of the ring trials. Patch users had more side effects than the COC group. Ring users generally had fewer adverse events than COC users but more vaginal irritation and discharge.The quality of the evidence for this review was considered low for the patch and moderate for the ring. The main reasons for downgrading were lack of information on the randomization sequence generation or allocation concealment, the outcome assessment methods, high losses to follow up, and exclusions after randomization.

Continuation rate of combined hormonal contraception: a prospective multicenter study

BACKGROUND

Data from clinical trials regarding continuation of use and contraceptive efficacy do not always apply to the general public. Therefore, a study among typical users was conducted to assess the continuation rate at the end of 12 cycles of combined hormonal contraceptive methods, reasons for discontinuation, and the Pearl index.

METHODS

Prospective, observational, and multicenter study of 3443 women aged 18 to 49 years starting one of the three combined hormonal contraception methods available in Spain (the vaginal ring, the contraceptive pill, and the transdermal skin patch).

RESULTS

The study population (intention-to-treat analysis) included 3443 women, of whom 45.4% were included in the vaginal ring group, 42.6% the pill group, and 12.1% the skin patch group. The continuation rate at 12 cycles was 45.9% for the pill, 42.3% for the vaginal ring, and 26.0% for the skin patch. The Pearl index was 0.61 (95% confidence interval [CI] 0-1.2) for the pill, 0.61 (95% CI 0-1.1) for the vaginal ring, and 2.34 (95% CI 0.3-9) for the skin patch (p<0.001).

CONCLUSION

At 12 cycles, the vaginal ring and the pill showed similar continuation rates and effectiveness, which were significantly higher than the skin patch.

High levels of women's satisfaction and compliance with transdermal contraception: results from a European multinational, 6-month study

OBJECTIVE

To investigate compliance, satisfaction, and preference in women using a transdermal contraceptive patch.

METHODS

Women (18-46 years) from eight European countries used contraceptive patches (norelgestromin 6 mg, ethinylestradiol 600 μg) for six, 4-week treatment cycles. Compliance, satisfaction, and preference were assessed after 3 and 6 cycles and study completion using self-report methods.

RESULTS

Of the 778 participants, 36.8% (n = 287) used no contraception at baseline. The most common methods were oral contraceptives (67.9%, n = 334) and barrier methods (21.5%, n = 106). Of oral contraception users, 63.5% (n = 212) were satisfied or very satisfied with their previous method, but compliance was poor with 77.8% (n = 260) reporting missed doses. After 3 and 6 cycles, >80% of all included women were satisfied or very satisfied with the patch. At study completion, most participants (73.7%) reported a preference for the patch compared to their previous method. Of 4107 cycles, 3718 (90.5%) were completed with perfect compliance. Two pregnancies occurred during this study, representing a Pearl Index of 0.63. No new safety issues were identified and the patch was well tolerated.

CONCLUSION

Women were highly satisfied with transdermal contraception and preferred this form of family planning over their previous method. Transdermal contraception represents a valuable addition to contraceptive options with potential to offer high compliance and efficacy.

Hormonal contraceptives for contraception in overweight or obese women

BACKGROUND

Obesity has reached epidemic proportions around the world. Metabolic changes in obesity and greater body mass may lead to reduced effectiveness of hormonal contraceptives, such as the skin patch, vaginal ring, implants, and injectables. We systematically reviewed the evidence on the effectiveness of hormonal contraceptives among overweight and obese women.

OBJECTIVES

To examine the effectiveness of hormonal contraceptives in preventing unplanned pregnancies among women who are overweight or obese versus women of lower weight or body mass index (BMI).

SEARCH STRATEGY

We searched MEDLINE, CENTRAL, POPLINE, EMBASE, ClinicalTrials.gov, and ICTRP. We also contacted investigators to identify other trials.

SELECTION CRITERIA

All study designs were eligible. Any type of hormonal contraceptive could have been examined. The primary outcome was pregnancy. Overweight or obese women must have been identified by an analysis cutoff for weight or BMI (kg/m(2)).

DATA COLLECTION AND ANALYSIS

Data were abstracted by two authors; life-table rates were included where available. For dichotomous variables, we computed an odds ratio with 95% confidence interval. The main comparisons were between overweight or obese women and women of lower weight or BMI.

MAIN RESULTS

We found 7 reports with data from 11 trials that included 39,531 women. One of three studies using BMI found a higher pregnancy risk for overweight or obese women. In the trial of two combination oral contraceptives, women with BMI >= 25 had greater pregnancy risk compared to those with BMI < 25 (OR 1.91; 95% CI 1.01 to 3.61). Among skin patch users, body weight was associated with pregnancy (reported P < 0.001) but BMI was not. Studies of a vaginal ring (never marketed) and a six-rod implant showed higher pregnancy rates for women weighing >= 70 kg versus those weighing < 70 kg (reported P values: 0.0013 and < 0.05, respectively). However, two implant studies showed no trend by body weight, and trials of an injectable had no pregnancies.

AUTHORS' CONCLUSIONS

Body weight addresses overall body size, while BMI generally reflects the amount of fat. Only one of three studies using BMI found a higher pregnancy risk for overweight women. The efficacy of implants and injectable contraceptives may be unaffected by body mass. The field could use trials of contraceptive methods with groups stratified by BMI. The current evidence on effectiveness by BMI is limited. However, the contraceptive methods examined here are still among the most effective when the recommended regimen is followed.

The effects of transdermal contraception on lipid profiles, carbohydrate metabolism and coagulogram in Thai women

OBJECTIVE

To evaluate the effects of the contraceptive patch on lipid profiles, carbohydrate metabolism and coagulogram in Thai women.

METHODS

Fifty healthy Thai women were assigned to use contraceptive patches. Blood chemistries test including liver function test, lipid profiles and coagulogram were evaluated at baseline, cycles 3 and 6.

RESULTS

Total cholesterol, triglyceride and HDL were significantly increased, whereas LDL was slightly decreased. The ratio of total cholesterol/HDL and LDL/HDL significantly decreased when applying the patch. After discontinued use of contraceptive patch, the women whose blood tests present hypercholesterol during patch use showed a continuous decrease in blood results of total cholesterol level over 3 months. Moreover, mean fasting glucose, SGOT, SGPT and alkaline phosphate were decreased. No woman suffering from VTE in this study.

CONCLUSIONS

The use of contraceptive patch does not exert a negative effect on carbohydrate metabolism, lipid profile, liver function test and blood coagulogram. However, further studies are required to elucidate the effect of the contraceptive on the patch user in long term.

[General practitioners' (GPs) practice regarding the line to take in case of missed pill]

OBJECTIVE

To explore general practitioners' (GPs) practice face of missed pill and prevention of such missings.

MATERIAL AND METHOD

Twenty-five GPs from Sarthe Department (Western France) took part in semistructured interview during which they expressed themselves on the prevention of missed pill and its consequences.

RESULTS

Twelve out of 20 physicians stated positively that their female patients often forget their pill. However, they noted that missed pill was seldom a reason for phone call or consultation. During the initial pill prescription, GPs insisted on how to take the pill (14/25) as well as advice in case of a missed pill (22/25), their availability (12/25) and the instruction leaflet (16/25). But only five quoted the importance of involving women in the choice of contraception. On prescription renewal, only nine out of 25 ask their patients about observance defect and eight out of 25 repeated the information. If patients asked for further explanation, only two doctors out of 25 had practices in line with the French National Authority for Health's (HAS) recommandation guidelines.

CONCLUSION

GPs' attitudes are partly due to a lack of practice's knowledge in primary and emergency contraception methods. It seems essential to promote GPs' training and to take into account their expectations and needs. Furthermore, female patient must be actor of the choice of her contraceptive method in order to improve compliance and, therefore, effectiveness.

Skin patch and vaginal ring versus combined oral contraceptives for contraception

BACKGROUND

The delivery of combination contraceptive steroids from a skin patch or vaginal ring offers potential advantages over the traditional oral route. The skin patch and vaginal ring could require a lower dose due to increased bioavailability and improved user compliance.

OBJECTIVES

To compare the contraceptive effectiveness, cycle control, adherence (compliance), and safety of the skin patch or the vaginal ring versus combination oral contraceptives (COCs).

SEARCH STRATEGY

For trials of the contraceptive patch or the vaginal ring, we searched MEDLINE, POPLINE, CENTRAL, EMBASE, LILACS, ClinicalTrials.gov, and ICTRP. We contacted manufacturers and researchers to identify other trials.

SELECTION CRITERIA

All randomized controlled trials comparing the skin patch or vaginal ring with a COC.

DATA COLLECTION AND ANALYSIS

Data were abstracted by two authors and entered into RevMan. For dichotomous variables, the Peto odds ratio (OR) with 95% confidence intervals (CI) was calculated. For continuous variables, the mean difference was computed.

MAIN RESULTS

We found 5 trials of the skin patch and 10 of the vaginal ring. Contraceptive effectiveness was similar for the patch or ring versus the comparison COC. More patch users discontinued early than COC users: ORs were 1.59 (95% CI 1.26 to 2.00), 1.56 (95% CI 1.18 to 2.06), and 2.57 (95% CI 0.99 to 6.64). Patch users also had more discontinuation due to adverse events. Compared to COC users, patch users reported more breast discomfort, dysmenorrhea, nausea, and vomiting. Patch users reported more compliant cycles than the COC users in two trials: ORs were 2.05 (95% CI 1.83 to 2.29) and 2.76 (95% CI 2.35 to 3.24). The ring trials generally showed similar discontinuation for ring and COC users. Ring users reported less nausea, acne, irritability, and depression than COC users. Ring users had more vaginitis and leukorrhea but less vaginal dryness. Ring users had similar adherence to COC users in two trials but less adherence in one. Cycle control was generally similar for the patch and COC, and was similar or better for the ring versus COC.

AUTHORS' CONCLUSIONS

Effectiveness was similar for the methods compared. The patch could lead to more discontinuation while the vaginal ring showed little difference. The patch group had better compliance than the COC group but more side effects. Ring users generally had fewer adverse events than COC users but more vaginal irritation and discharge. High losses to follow up can affect the validity of the results.

Bone accretion in adolescents using the combined estrogen and progestin transdermal contraceptive method Ortho Evra: a pilot study

OBJECTIVE

To date, there are no data regarding the effect of the transdermal combined estrogen and progestin contraceptive Ortho Evra on bone mineral content (BMC) and bone mineral density (BMD). We examined the effects of transdermally delivered ethinyl estradiol and norelgestromin on whole body (WB) BMC and BMD of the hip and lumbar spine (LS) of adolescent girls.

METHODS

In a matched case-control study, girls (n = 5) who applied Ortho Evra for days 1-21 followed by days 22-28 free of medication for 13 cycles (about 12 months) were compared with 5 age- and ethnicity-matched control girls. Evaluations of calcium intake; bone-protective physical activity; bone densitometry (DXA, QDR 4500A, Hologic); bone formation markers serum osteocalcin (OC) and bone-specific alkaline phosphatase (BAP); bone resorption marker urinary N-telopeptide (uNTX); insulin growth factor-1 (IGF-1); and sex hormone binding globulin (SHBG) were carried out at initiation, 6 months, and 12 months. Changes from baseline were compared using mixed models, adjusting for follow-up comparisons using the Holm Test (sequential Bonferroni).

RESULTS

There were no significant differences (SD) between groups at baseline in age, gynecologic age, WBBMC, hip BMD, and LSBMD. Girls on Ortho Evra did not change significantly in WBBMC (12-month mean increase 0.2% +/- 0.8%), whereas controls did (3.9% +/- 1.8%, P < or = .001, adjusted P = .002), with SD between the 2 groups (P = .007, adjusted P = .036). Adolescents on Ortho Evra did not change significantly in hip BMD (12-month mean increase 0.5% +/- 0.6%), whereas controls did (2.7% +/- 0.6%, P < or = .001, adjusted P = .004), with SD between the 2 groups (P = .024) prior to adjustment for multiple comparisons, but no SD after adjustment (P = .096). Similarly, although the increase in LSBMD within the control group after 12 months (mean increase 2.8% +/- 1.0%) was statistically significant (P = .009, adjusted P = .044), the change within the treatment group (12-month mean increase 0.8% +/- 0.8%) was not. However, percent LSBMD changes after 12 months did not significantly differ between the 2 groups before or after adjustment for multiple comparisons. Calcium intake and bone-protective physical activity did not significantly predict BMC and BMD changes of study participants. There was a significantly greater increase in SHBG levels in the treatment group after 6 months (P = .003, adjusted P = .013) and 12 months (P < or = .001, adjusted P < or = .001) than in controls. Changes in levels of OC, BAP, uNTX, and IGF-1 were not significantly different between the 2 groups.

CONCLUSIONS

Ortho Evra use attenuates bone mass acquisition in young women who are still undergoing skeletal maturation. This attenuation may be attributed in part to increased SHBG levels, which reduce the concentrations of free estradiol and free testosterone that are available to interact with receptors on the bone. Clinical implications remain to be determined in studies with a larger number of adolescents.

Combined hormonal contraception and venous thromboembolism

This review provides an update of knowledge regarding venous thromboembolism (VTE) and combined hormonal contraceptives (CHCs) in the light of new progestins and new administration routes for CHCs. Practical recommendations are also offered. The association between the use of combined oral contraceptives (COCs) and an increased risk of VTE has been known about for many years, it being related mainly to the dose of oestrogen; however, recent research has also shown the influence of the type of progestin. When compared to COCs containing levonorgestrel or norethisterone, those containing desogestrel or gestodene present a two-fold greater risk of VTE; for COCs containing cyproterone acetate, the risk is four-fold greater, while there are no or insufficient data for those containing norgestimate, chlormadinone acetate or drospirenone. With regard to the contraceptive patch, the available data suggest that the risk of VTE is similar to that observed with COCs. There are no data concerning vaginal rings. The greatest risk of COC-associated VTE occurs during the first year of use, thus suggesting the existence of a predisposing condition, such as being a carrier of a thrombogenic mutation with which the COCs would exert a synergistic effect. Routine screening for such conditions is not justified. Changes in haemostatic variables produced by COCs, for example, acquired resistance to protein C, could be linked to VTE, although it has yet to be demonstrated that such alterations are related to a clinical risk of VTE among COC users. At present there are no laboratory tests able to detect an increased risk of VTE in asymptomatic women. The key procedures in terms of ensuring the safe use of this contraceptive method are a full clinical, personal and family history, in order to evaluate risk factors for VTE and cardiovascular disease, along with the recording of blood pressure and body mass index prior to the prescription of COCs.

Satisfaction and compliance in hormonal contraception: the result of a multicentre clinical study on women's experience with the ethinylestradiol/norelgestromin contraceptive patch in Italy

Background

For many women finding the right contraceptive method can be challenging and consistent and correct use over a lifetime is difficult. Even remembering to take a birth control pill every day can be a challenge. The primary objective of this study was to evaluate women's experience with a weekly ethinylestradiol/norelgestromin contraceptive patch (EE/NGMN patch), given new technologies recently developed in hormonal contraception to increase women's options in avoiding daily dosing.

Methods

In 24 Italian sites, 207 women received the EE/NGMN patch for up to 6 cycles. At study end, overall satisfaction and preference, as well as compliance, efficacy and safety, were evaluated.

Results

175 women (84.5%) completed the study. The overall satisfaction rate was 88%; convenience and once-a-week frequency of the patch were especially appreciated. At baseline, 82 women (39.4%) were using a contraceptive method, mainly oral contraceptives and barrier methods, but only 45.1% were very satisfied/satisfied; after 6 months with the patch, 86.3% of this subset was very satisfied/satisfied. Considering the method used in the 3 months before the study entry, 78.1% strongly preferred/preferred the patch, for convenience (53.9%), ease of use/simplicity (28.9%), fewer (9.2%) and less severe (2.6%) side effects. Compliance was very high: 1034/1110 cycles (93.2%) were completed with perfect compliance and the mean subject's compliance score was 90%. One on-therapy pregnancy occurred. The patch was safe and well tolerated: adverse events frequency was low, with predominantly single reports of each event. Most of them started and subsided during cycle 1.

Conclusion

This study demonstrated that the EE/NGMN patch is associated with high satisfaction levels and excellent compliance. At study end, the majority of women indicated that they would continue using the patch.

Safety, efficacy and patient acceptability of the combined estrogen and progestin transdermal contraceptive patch: a review

The worldwide introduction of the first, unique patch for hormonal contraception (ethinyl estradiol/norelgestromin, EE/NGMN patch) was widely recognized as a significant event in the development of drug delivery systems. This innovation offers a number of advantages over the oral route, and extensive clinical trials have proved its safety, efficacy, effectiveness, and tolerability. The weekly administration and ease of use/simplicity of the EE/NGMN patch contribute to its acceptability, and help to resolve the two main problems of non-adherence, namely early discontinuation and inconsistent use. The patch offers additional benefits to adolescents (improvement of dysmenorrhea and acne), adults (improvement in emotional and physical well-being, premenstrual syndrome, and menstrual irregularities), and perimenopausal women (correction of hormonal imbalance, modulation of premenopausal symptoms), thus providing high satisfaction rates (in nearly 90% of users). Since its introduction, the transdermal contraceptive patch has proved to be a useful choice for women who seek a convenient formulation which is easy to use, with additional, non-contraceptive tailored benefits for all the ages.

La contraception des adolescentes en France en 2007

The two main objectives of adolescence contraception are the eviction of involuntary pregnancies and the prevention of sexually transmitted infections. In France, in spite of our rich contraceptive arsenal and a widely spread information, the rate of voluntary termination of pregnancy keeps growing among the teenagers population--and this, probably because the gap between theoretical effectiveness and practice of contraception is particularly wide among the young people. Every contraceptive means can be used by teenagers; the best option being, it seems, the "double DUTCH", which consists of concomitant use of condoms and hormonal contraception. Most often, the consultation for contraception is the first gynaecological consultation. That is the reason why it is usually stressful for teenagers who dread undergoing a gynaecological examination. If this examination is not necessary for most of young patients, it is essential to create a trustful relationship and to make explicit the several contraceptive methods. During this consultation it is interesting to look for common teenage troubles like addiction to smoking and eating disorders. For any prescription of hormonal contraception, it is important to explain the benefits and the possible side effects, to stress the observance and to tell the teenager about the recommendations in case of forgetting. Concerning condom - the only efficient way of preventing sexually transmitted infections--, it is useful to talk about it in concrete and straightforward terms, to show its handling and to inform about risks of tearing. With this state of mind, an emergency contraception can be prescribed straightaway in order to make its use easier. Also, without any moralizing speech, the need for maturity must be emphasized as well as taking care of one's body with the aim of avoiding a premature pregnancy or any sexually transmitted infection. This consultation must be coupled with a close follow-up, availability and mutual confidence which are the main elements vouching for a good observance and consequently an efficient contraception.

Contraception today

Modern contraceptive methods represent more than a technical advance: they are the instrument of a true social revolution-the "first reproductive revolution" in the history of humanity, an achievement of the second part of the 20th century, when modern, effective methods became available. Today a great diversity of techniques have been made available and-thanks to them, fertility rates have decreased from 5.1 in 1950 to 3.7 in 1990. As a consequence, the growth of human population that had more than tripled, from 1.8 to more than 6 billion in just one century, is today being brought under control. At the turn of the millennium, all over the world, more than 600 million married women are using contraception, with nearly 500 million in developing countries. Among married women, contraceptive use rose in all but two developing countries surveyed more than once since 1990. Among unmarried, sexually active women, it grew in 21 of 25 countries recently surveyed. Hormonal contraception, the best known method, first made available as a daily pill, can today be administered through seven different routes: intramuscularly, intranasally, intrauterus, intravaginally, orally, subcutaneously, and transdermally. In the field of oral contraception, new strategies include further dose reduction, the synthesis of new active molecules, and new administration schedules. A new minipill (progestin-only preparation) containing desogestrel has been recently marketed in a number of countries and is capable of consistently inhibiting ovulation in most women. New contraceptive rings to be inserted in the vagina offer a novel approach by providing a sustained release of steroids and low failure rates. The transdermal route for delivering contraceptive steroids is now established via a contraceptive patch, a spray, or a gel. The intramuscular route has also seen new products with the marketing of improved monthly injectable preparations containing an estrogen and a progestin. After the first device capable of delivering progesterone directly into the uterus was withdrawn, a new system releasing locally 20 microg evonorgestrel is today marketed in a majority of countries with excellent contraceptive and therapeutic performance. Finally, several subcutaneously implanted systems have been developed: contraceptive "rods," where the polymeric matrix is mixed with the steroid and "capsules" made of a hollow polymer tube filled with free steroid crystals. New advances have also been made in nonhormonal intrauterine contraception with the development of "frameless" devices. The HIV/AIDS pandemic forced policy makers to look for ways to protect young people from sexually transmitted diseases as well as from untimely pregnancies. This led to the development of the so-called dual protection method, involving the use of a physical barrier (condom) as well as that of a second, highly effective contraceptive method. More complex is the situation with antifertility vaccines, still at a preliminary stage of development and unlikely to be in widespread use for years to come. Last, but not least, work is in progress to provide effective emergency contraception after an unprotected intercourse. Very promising in this area is the use of selective progesterone receptor modulators (antiprogestins).

Venous Thromboembolism, Myocardial Infarction, and Stroke Among Transdermal Contraceptive System Users

OBJECTIVE

To estimate the incidence of venous thromboembolism, acute myocardial infarction, and ischemic stroke among transdermal contraceptive system users compared with users of norgestimate-containing oral contraceptives with 35 mcg ethinyl estradiol.

METHODS

We began with insurance claims data from UnitedHealthcare. We identified women exposed to the transdermal contraceptive system or norgestimate-containing oral contraceptives from April 2002 through December 2004. Outcomes were confirmed from medical records. We calculated incidence rates and age-adjusted incidence rate ratios. In a nested case-control analysis, we investigated and controlled for confounding.

RESULTS

There were 49,048 woman-years of transdermal contraceptive system exposure and 202,344 woman-years of norgestimate-containing oral contraceptives exposure. There was a more than two-fold increase in the venous thromboembolism rate (incidence rate ratio 2.2, 95% confidence interval [CI] 1.3-3.8) among transdermal contraceptive system users (20 cases, 40.8 per 100,000 woman-years) compared with norgestimate-containing oral contraceptives users (37 cases, 18.3 per 100,000 woman-years). Acute myocardial infarction occurred in three transdermal contraceptive system users compared with seven among norgestimate-containing oral contraceptives users (incidence rate ratio 1.8, 95% CI 0.5-6.8). No strokes occurred among transdermal contraceptive system users, whereas 10 occurred among norgestimate-containing oral contraceptives users. In the nested case-control analysis, after exclusions for high-risk factors, the odds ratio for venous thromboembolism was 2.4 (95% CI 1.1-5.5).

CONCLUSION

There was a more than two-fold increase in the risk of venous thromboembolism associated with use of the transdermal contraceptive system. Acute myocardial infarction and stroke occurred too rarely to ascertain precise risk estimates.

LEVEL OF EVIDENCE

II.

Practical considerations for the treatment of elderly patients with migraine

Treatment of migraine presents special problems in the elderly. Co-morbid diseases may prohibit the use of some medications. Moreover, even when these contraindications do not exist, older patients are more likely than younger ones to develop adverse events. Managing older migraine patients, therefore, necessitates particular caution, including taking into account possible pharmacological interactions associated with the greater use of drugs for concomitant diseases in the elderly. Paracetamol (acetaminophen) is the safest drug for symptomatic treatment of migraine in the elderly. Use of selective serotonin 5-HT(1B/1D) receptor agonists ('triptans') is not recommended, even in the absence of cardiovascular or cerebrovascular risk, and NSAID use should be limited because of potential gastrointestinal adverse effects. Prophylactic treatments include antidepressants, beta-adrenoceptor antagonists, calcium channel antagonists and antiepileptics. Selection of a drug from one of these classes should be dictated by the patient's co-morbidities. Beta-adrenoceptor antagonists are appropriate in patients with hypertension but are contraindicated in those with chronic obstructive pulmonary disease, diabetes mellitus, heart failure and peripheral vascular disease. Use of antidepressants in low doses is, in general, well tolerated by elderly people and as effective, overall, as in young adults. This approach is preferred in patients with concomitant mood disorders. However, prostatism, glaucoma and heart disease make the use of tricyclic antidepressants more difficult. Fewer efficacy data in the elderly are available for selective serotonin reuptake inhibitors, which can be tried in particular cases because of their good tolerability profile. Calcium channel antagonists are contraindicated in patients with hypotension, heart failure, atrioventricular block, Parkinson's disease or depression (flunarizine), and in those taking beta-adrenoceptor antagonists and monoamine oxidase inhibitors (verapamil). Antiepileptic drug use should be limited to migraine with high frequency of attacks and refractoriness to other treatments. Promising additional strategies include ACE inhibitors and angiotensin II type 1 receptor antagonists because of their effectiveness and good tolerability in patients with migraine, particularly in those with hypertension. Because of its favourable compliance and safety profile, botulinum toxin type A can be considered an alternative treatment in elderly migraine patients who have not responded to other currently available migraine prophylactic agents. Pharmacological treatment of migraine poses special problems in regard to both symptomatic and prophylactic treatment. Contraindications to triptan use, adverse effects of NSAIDs, and unwanted reactions to some antiemetics reduce the list of drugs available for the treatment of migraine attacks in elderly patients. The choice of prophylactic treatment (beta-adrenoceptor antagonists, calcium channel antagonists, antiepileptics, and more recently, some antihypertensive drugs) is influenced by co-morbidities and should be directed at those drugs that are believed to have fewer adverse effects and a better safety profile. Unfortunately, for most of these drugs, efficacy studies are lacking in the elderly.

Hormonal contraception in adolescents: special considerations

With the rates of unintended pregnancies in teenagers remaining high, it is crucial to present adolescents with all of the contraceptive options available to them. While barrier methods, for example, male condoms, are easily accessible and do not have adverse effects, their use must be consistent and correct with each act of intercourse. Hormonal contraception affords much better efficacy in preventing pregnancy when used with full compliance. Oral contraceptives are a popular method of contraception among adolescents and offer many non-contraceptive benefits along with the prevention of pregnancy. They have very few significant adverse effects, which are outweighed by the significant morbidity associated with teenage pregnancies, and can be used by most adolescent females. However, their minor bothersome effects do contribute to the high discontinuation rates seen. In addition, many girls find it difficult to remember to take a pill every day, leading to higher failure rates in teenagers than in adult women. The advent of long-acting, progestogen (progestin)-only methods, such as injectables and implantables, has been generally accepted by adolescents and these methods have proven to be more efficacious by avoiding the need for daily compliance. However, progestogen-only methods cause irregular bleeding and amenorrhea, which is not acceptable to many teenagers. In addition, the most widely used implant was taken off the market a few years ago and newer forms are not yet widely accessible. Other novel methods are currently available, including the transdermal patch and the vaginal ring. Both are combinations of estrogen and progestogen and have similar efficacy and adverse effect profiles to oral contraceptives. Their use may be associated with greater compliance by adolescents because they also do not require adherence to a daily regimen. However, there may be some drawbacks with these newer methods, for example, visibility of the patch and difficulty with insertion of the vaginal ring. When regular contraceptive modalities fail, emergency contraception is available. Choices include combination oral contraceptives, progestogen-only pills, mifepristone, or placement of a copper-releasing intrauterine device. These methods can be very useful for preventing pregnancy in adolescents as long as adolescents are aware of their existence and have easy access to them.

Medical eligibility criteria for new contraceptive methods: combined hormonal patch, combined hormonal vaginal ring and the etonogestrel implant

To review evidence on the combined hormonal patch, combined hormonal vaginal ring and the etonogestrel implant, with a focus on safety and effectiveness of use among women with special health conditions, we searched MEDLINE, Pre-MEDLINE and the Cochrane Library for reports published from 1980 through March 2005. Articles eligible for review included 11 on the hormonal patch, nine on the hormonal ring, and 11 on the etonogestrel implant. Limited evidence suggests patch efficacy is lower among women>90 kg. No evidence was identified for vaginal ring use among women with medical conditions. A single small study found that etonogestrel implants had no adverse effects on bone mineral density among women 18-40 years old. Limited evidence also suggests no adverse effects of the etonogestrel implant on lactation parameters or infant development among users enrolled 28 to 56 days postpartum and followed for 4 months.

Contraception: an international perspective

Although it is estimated that the population growth rate will decline to a replacement level by 2050, it is also now predicted that the total world population will reach 8.9 billion in that year -- far higher than the 2004 estimate of 6.4 billion. More than 26 billion new couples will need contraceptives in the next half century. Although a steady increase in contraceptive use has been observed in both developed and developing countries, the contraceptive needs of a high percentage of couples have not yet been met and the number of unplanned pregnancies continues to increase. The actual use of contraception differs from region to region. Although no new method has been registered for many years, several new products have been marketed during the last 5. Among these are new implants, medicated intrauterine systems, contraceptive vaginal rings, transdermal patches and several new combined oral contraceptive formulations. New contraceptive methods have been developed to meet the objectives of expanding contraceptive choices for both women and men and answering an unmet need for contraceptives with a long-term action that meet the expectations of consumers. Simplicity, reversibility and effectiveness are the desired features of a male contraceptive, but no new male contraceptive method is yet available. New areas of basic research include studies on genes, proteins and enzymes involved in the reproductive system. The new methods will be targeted to specific interactions within the reproductive system at the level of ovaries and testes, as well as between spermatozoa and ova. This futuristic approach still keeps in mind the need for better access to existing contraceptive methods, as well as the discovery of new contraceptives that are simple to use, safe, reversible and inexpensive. In the future, contraceptives may be combined with other medicinal agents to provide dual protection against both pregnancy and other preventable conditions, such as sexually transmitted infections.

[Update on contraception]

Since the introduction of hormonal contraceptives in the 1960s, great advances have been achieved in contraception. Biological effects of sexual steroids as well as risks and benefits of oral contraception are better estimated. After the development of a new hormone-containing intra-uterine system, new hormone delivery systems offer women safe and effective contraceptive options. These new options that combine high efficacy and ease of use should allow better acceptance and compliance than daily pill ingestion and should then reduce the high rate of unintended pregnancies terminated by elective abortion. Transdermal contraceptive system and vaginal ring offer a promising innovative approach in pregnancy prevention. Subdermal implants give women the choice of a highly effective contraceptive system in spite of significant side effects. New hormonal delivery systems such as injectables are under development. Hysteroscopic tubal sterilization is now also available and is a very effective procedure. This wide variety of new contraceptive methods offers a marked improvement from previous medications for users by providing better efficacy and tolerability.

Contraception during perimenopause

Perimenopause marks the transition from normal ovulation to anovulation and ultimately to permanent loss of ovarian function. Fecundity, the average monthly probability of conception, declines by half as early as the mid-forties, however women during the perimenopause still need effective contraception. Issues arising at this period such as menstrual cycle abnormalities, vasomotor instability, the need for osteoporosis and cardiovascular disease prevention, as well as the increased risk of gynecological cancer, should be taken into consideration before the initiation of a specific method of contraception. Various contraceptive options may be offered to perimenopausal women, including oral contraceptives, tubal ligation, intrauterine devices, barrier methods, hormonal injectables and implants. Recently, new methods of contraception have been introduced presenting high efficacy rates and minor side-effects, such as the monthly injectable system, the contraceptive vaginal ring and the transdermal contraceptive system. However, these new methods have to be further tested in perimenopausal women, and more definite data are required to confirm their advantages as effective contraceptive alternatives in this specific age group. The use of the various contraceptive methods during perimenopause holds special benefits and risks that should be carefully balanced, after a thorough consultation and according to each woman's contraceptive needs.

Delivery options for contraceptives

Although a steady increase in contraceptive use has been observed in developed and less-developed countries, the contraceptive needs of a significant proportion of couples have not yet been met, resulting in an increase in unplanned pregnancies. Several new contraceptive products have reached the market during the past few years. Among these are new implants, a medicated intrauterine device, contraceptive vaginal rings, transdermal patches and several new regimen of combined oral contraceptives. These new or improved methods have been developed to expand the contraceptive choices available to women and men as well as to respond to the unmet need for contraceptives with long-term activity. New targets are being identified both in the ovary and the testes for a more specific non-hormonal contraception. This futuristic approach still keeps in mind the need for better access to existing contraceptive methods, as well as the discovery of new contraceptives that are simple to use, safe, reversible and inexpensive. In recent years, there has been great interest in agents that provide dual protection against pregnancy and sexually transmitted infections (STI), especially human immunodeficiency virus (HIV). A contraceptive method providing dual medical benefits might increase motivation for consistent use, thus reducing contraceptive failures and unwanted pregnancies.

Extended Use of Transdermal Norelgestromin/Ethinyl Estradiol: A Randomized Trial

OBJECTIVE

To compare bleeding profiles and satisfaction among women using a norelgestromin/ethinyl estradiol (E2) transdermal contraceptive patch in an extended regimen to those among women using a traditional 28-day patch regimen.

METHODS

Healthy, regularly menstruating women (N = 239) were randomly assigned (2:1 ratio) to receive the norelgestromin/ethinyl E2 transdermal patch in an extended regimen (weekly application for 12 consecutive weeks, 1 patch-free week, and 3 more consecutive weekly applications, n = 158) or a cyclic regimen (4 consecutive cycles of 3 weekly applications and 1 patch-free week, n = 81). Subjects recorded bleeding data daily and completed satisfaction questionnaires. Subjects and investigators provided overall assessments of the regimens.

RESULTS

Extended use of the norelgestromin/ethinyl E2 transdermal patch resulted in fewer median bleeding days (6 compared with 14, P < .001), bleeding episodes (1 compared with 3, P < .001), and bleeding or spotting episodes (2 compared with 3, P < .001) compared with cyclic use during days 1-84; median numbers of bleeding or spotting days were similar between regimens (14 compared with 16, P = .407) during this time. Extended use delayed median time to first bleeding to 54 days compared with 25 days with cyclic (P < .001). Subjects were highly satisfied with both regimens. Although not statistically significant, slightly more adverse events were reported with the extended than with the 28-day regimen.

CONCLUSION

Compared with cyclic use, extended use of the norelgestromin/ethinyl E2 transdermal patch delayed menses and resulted in fewer bleeding days. This regimen may represent a useful alternative for women who prefer fewer episodes of withdrawal bleeding.

Adolescents' experience with the combined estrogen and progestin transdermal contraceptive method Ortho Evra

BACKGROUND

The new combined estrogen & progestin contraceptive patch Ortho Evra was approved by the FDA in December 2001. To date, there is a paucity of data regarding its use in the adolescent age group. We examined adolescents' experience with this new contraceptive method.

METHODS

Using a questionnaire designed by the authors, care providers in a hospital based adolescent clinic interviewed and reviewed the charts of adolescent girls who had initiated Ortho Evra in 2002-2003.

RESULTS

Twenty-eight adolescent girls (age 18 +/- 1 years, gyn age 6 +/- 1 years, onset of sexual intercourse at 14 +/- 1 years, body mass index (BMI) 27.6 +/- 1.2, 57% Hispanic, 21% Caucasian, 11% African American, 7% biracial, 4% Indian American) who had used Ortho Evra for 7 +/- 1 months were enrolled. Half (50%) were adolescent mothers, and 57% had a history of irregular menstrual periods. All (100%) girls reported regular menstrual periods while using Ortho Evra, with only 14% experiencing occasional breakthrough bleeding. Half reported a shorter duration and 36% reported a lighter flow of their periods. About a third (39%) reported a decrease and 11% reported an increase in dysmenorrhea symptoms. About a third (29%) of those with a history of recurrent headaches at initiation reported decrease in headaches, and about a third (33%) of those with acne at initiation reported decrease in facial acne while on Ortho Evra. There were no significant BMI changes during Ortho Evra use. Although condom use while on Ortho Evra was poor (only 15% reporting consistent condom use), there were no pregnancies reported. A majority (93%) reported that they remembered to apply the patches on time, and 40% stated that Ortho Evra was easier than previous contraceptive methods. Two thirds (68%) were very satisfied and 29% were somewhat satisfied with the method, and 93% stated that they would recommend the method to a friend/relative. The preferred application site was the buttock (40%) followed by the lower abdomen (32%). About a fifth (21%) experienced at least one episode of complete patch detachment and 32% reported partial peeling of the patch corners. About a third (32%) would prefer another patch color, and 25% would like a fourth week placebo patch. The most common side effects were mild temporary application site reactions (64%), some discomfort on patch removal (32%), nausea (18%), and breast tenderness (18%). Eleven girls (39%) discontinued Ortho Evra (three lost health insurance, three because of application site reactions, two found patch application schedule difficult to remember, two desired pregnancy, two because of nausea, one because of perceived weight gain).

CONCLUSIONS

Ortho Evra provides excellent cycle control in adolescents. Most adolescents are satisfied with this method. Intensive efforts should be made to increase condom use by adolescents on Ortho Evra.

Contraception for college students

An important issue for human beings is the acquisition of normal sexual health, including the understanding and application of reproductive health when needed. Comprehensive sexuality education is not a topic provided to many children, adolescents, or college students in the United States, however. Students who were sexually active in high school may continue to be at risk for unwanted pregnancies and sexually transmitted diseases in their college life; those who chose abstinence in high school may abandon this concept in college, choosing coital behavior at all levels of university life-freshman through graduate levels. Most American college students are sexually active and many have multiple partners. This article reviews current contraceptive methods available to college students. College health providers and pediatricians are urged to be vigilant about the reproductive health needs of the college students they serve.

Drug delivery systems for oestrogenic hormones and antagonists: the need for selective targeting in estradiol-dependent cancers

The pleiotropic activity of oestrogens and their mechanism of action via their binding to the two oestrogen receptors alpha (ER alpha) and beta (ER beta) subtypes in the different tissues where oestrogens exert their action have been briefly described. The fate of these compounds trapped into different galenic forms is discussed with regard to their therapeutic applications. Firstly, the advantages and disadvantages of the different forms (pills, i.v. forms and transdermal patches) used in contraception are compared. Secondly, the therapeutic use of formulated oestrogens for the post-menopausal hormone replacement therapy (HRT) is analysed through the various results obtained in different trials. The link between HRT and the risks of breast cancer and cardiovascular disease is underlined. Finally, comparing the activity of selective oestrogen receptor modulators such as tamoxifen and pure anti-oestrogens such as RU58668 and ICI182780, we analysed the reasons leading to the need for a tumor targeting of the latters, but not of the former for the treatment of oestrogen-dependent breast cancer. Different injectable and biodegradable formulations, that lead to a remarkable anti-tumor efficiency in xenografts, have been recently developed and we believe that they may represent promising new administration ways of added therapeutic values for anti-oestrogens. Such devices could be extended to the delivery of other anti-cancer drugs with more aggressive activities than anti-oestrogens.

The transdermal contraceptive system

The transdermal contraceptive system or contraceptive patch (Ortho EVRA, Ortho-McNeil Pharmaceuticals, Raritan, NJ), approved by the Food and Drug Administration in November 2001, is a novel combination hormonal contraceptive that contains the hormones norelgestromin and ethinyl estradiol. In clinical trials, the contraceptive patch was shown to have comparable safety and efficacy with that of oral contraceptives (OCs), and results indicated that the women who used the patch did so more correctly and consistently than those who used OCs. The enhanced patient compliance may be due to the once-a-week dosing and relative ease of use of this system. The transdermal delivery approach minimizes the "peaks and troughs" of hormone concentrations associated with daily oral administration and avoids hepatic first-pass metabolism. Side effects are similar to those seen with OCs with the exception of application site reactions that are obviously unique to transdermal delivery.

The impact of improved compliance with a weekly contraceptive transdermal system (Ortho Evra®) on contraceptive efficacy

OBJECTIVE

The contraceptive efficacy of perfect dosing cycles and imperfect dosing cycles has not been described previously. Method compliance determines the proportion of perfect and imperfect dosing cycles, and together can form the basis for evaluating differences in efficacy based on differences in compliance.

MATERIALS AND METHODS

The transdermal contraceptive delivery system (Ortho Evra) has been studied in a North American randomized trial vs. an oral contraceptive (OC) and in total has been evaluated in 3319 women in contraceptive clinical trials. This article explores the impact of perfect vs. imperfect compliance with the contraceptive method on contraceptive efficacy. Previously published data for a transdermal system (Patch, n = 812) and OC (Triphasil, n = 605) users from the North American comparative study were reanalyzed to determine the effect of imperfect use on the contraceptive efficacy of the different methods.

RESULTS

Contraceptive efficacy was significantly better (p = 0.007) in cycles with perfect dosing (Pearl Index = 0.83) compared to those with imperfect dosing (Pearl Index = 6.32) for both methods. This difference is homogeneous (p = 0.62) across the Patch and OC groups. Pooled data for all Patch users confirm that perfect dosing cycles are associated with significantly better efficacy than imperfect dosing cycles (p = 0.047). In addition, compliance did not vary by age in the pooled Patch data, which are in agreement with the previously published Patch data from the comparative study. In the comparative study, the percentage of cycles with perfect dosing was significantly higher with the Patch than with the OC (88.7% vs. 79.2%, p < 0.001), and was consistently high in all age groups (range, 89.6-91.8%). By contrast, among OC users, the percentage of cycles with perfect dosing increased with increasing age (p < 0.001) from 67.7% in users aged 18-20 years to more than 80% in those aged 30 years and older.

CONCLUSION

In conclusion, deviations from perfect use (whether corrected or not) of a transdermal contraceptive system and of an OC increase contraceptive failures by approximately 5-10-fold when compared to perfect use. The weekly change schedule of the transdermal contraceptive delivery system is associated with a significantly greater proportion of cycles in which there is perfect dosing compared to an OC.

New Hormonal Contraceptives: A Comprehensive Review of the Literature

Over 16 million women in the United States take oral hormonal contraceptives, yet approximately 5% experience an unintended pregnancy during the first year of use. Compliance with the regimen is important in maintaining cycle control and preventing pregnancy. New hormonal contraceptive agents, norelgestromin-ethinyl estradiol patch, etonogestrel-ethinyl estradiol vaginal ring, and medroxyprogesterone-estradiol cypionate injection, were designed to increase compliance and decrease adverse effects while maintaining efficacy. Each one has potential advantages for women seeking alternatives to traditional oral contraceptives or for those who have trouble remembering to take a daily pill. Each agent also may have its own disadvantages, including application site reactions, need for monthly injections, and device-related events; however, all have similar efficacy and adverse-effect profiles compared with current oral hormonal contraceptives.

Ortho Evra, a new contraceptive patch

Ortho Evra is the first transdermal patch approved for the prevention of pregnancy. Comparative trials have shown that Ortho Evra has efficacy similar to the oral contraceptives Mercilon (not available in the United States) and Triphasil for the prevention of pregnancy when used as directed. Adverse effects with Ortho Evra are similar to those reported with combined oral contraceptives, with the exceptions of mild-to-moderate application-site reactions and an increased frequency of breast symptoms. The most commonly reported adverse reactions were breast symptoms, headache, application-site reactions, nausea and vomiting, dysmenorrhea, and abdominal pain. Approximately 5% of study subjects had at least one patch that did not stay attached to their skin, and about 2% of women withdrew from clinical trials due to irritation from the patch. In clinical studies, the patch appeared to be less effective in women weighing more than 90 kg than in women with lower body weights. More research is needed on the relationship between body weight and contraceptive patch efficacy. In two clinical trials, compliance was greater with the patch than with oral contraceptives. Whether this will result in reduced pregnancy rates in general use is unknown. Additional studies are warranted to determine if the patch offers any significant efficacy or safety advantages over current methods of hormonal contraception.

New methods of hormonal contraception

Several new hormonal contraceptive methods have recently been approved by the Food and Drug Administration. most new methods combine the high efficacy of oral contraceptives with the longer-term delivery methods that eliminate the need to take a pill each day. New methods also offer reversibility and resumption of fertility if desired. This article discusses these new methods and reviews the literature on efficacy and side effects.

Contraceptive needs of the perimenopausal woman

Although there are many definitions of the perimenopause, all include the concept of transition from physiologic ovulatory menstrual cycles to hyperestrogenic anovulation and ultimately to hypoestrogenic ovarian shutdown. With this comes a transition from childbearing, and its requirement for contraception, to the infertility of menopause. There is no contraceptive method that is contraindicated merely by age. The contraceptive needs of the perimenopausal woman, however, may be better suited to some methods over others. This article explores various methods of contraception for the perimenopausal woman, including female sterilization, barrier methods, intrauterine devices, injectables, implants, and oral contraceptives.

Contraceptive applications of estrogen

Estrogens are a primary component of several contraceptive methods: combined oral contraceptive pills, a combined injectable contraceptive, the combined contraceptive vaginal ring, the combination transdermal contraceptive patch, and combined emergency contraceptive pills. Contraceptive formulations that contain estrogen are referred to as combined contraceptives because they also contain some form of progestin. This article reviews the contraceptive methods containing estrogen, beginning with a discussion of combined oral contraceptive pills. Formulations and clinical management, mechanisms of action, noncontraceptive benefits of use, therapeutic uses in addition to contraception, side effects, contraindications to use, and drug-drug interactions are described. Information follows about the newer combined contraceptive products including the injection, vaginal ring, and patch. Finally, combined emergency contraceptive pills are reviewed. Thorough knowledge of the contraceptive methods containing estrogen enables clinicians to provide expert care for women using these products.

Pharmacokinetics of a contraceptive patch (Evra/Ortho Evra) containing norelgestromin and ethinyloestradiol at four application sites

AIMS

To determine the pharmacokinetic profile of norelgestromin (NGMN) and ethinyloestradiol (EE) following application of the contraceptive patch, Evra/Ortho Evra, at each of four anatomic sites (abdomen, buttock, arm, and torso).

METHODS

Thirty-seven healthy, nonpregnant women aged 20-45 years participated in this open-label, four-period crossover study. Subjects were randomized to one of four treatment (site of application) sequences. Each patch was worn for 7 days, with a 1 month washout between treatments. Blood samples were collected before and at various times up to 240 h after application of each patch. Serum samples were assayed for NGMN and EE by validated methods.

RESULTS

The serum concentration reference ranges for NGMN and EE are 0.6-1.2 ng ml-1 and 25-75 pg ml-1, respectively, based on studies of the mean Cave of oral norgestimate 250 microg and EE 35 microg. For all application sites, mean concentrations of NGMN and EE remained within these ranges during the 7 day wear period. Absorption of NGMN and EE during patch application on the buttock, arm, and torso was equivalent. Absorption of NGMN and EE during patch application on the abdomen was approximately 20% less than observed for the other three sites, although mean serum concentrations were still within reference ranges. A previous study demonstrated therapeutic equivalence of patches worn on the abdomen vs other sites.

CONCLUSIONS

Serum concentrations of NGMN and EE from the contraceptive patch remain within the reference ranges throughout the 7 day wear period, regardless of the site of application (abdomen, buttock, arm, or torso).

Integrated summary of Ortho Evra/Evra contraceptive patch adhesion in varied climates and conditions

OBJECTIVE

To assess the adhesive reliability of the contraceptive patch (Ortho Evra/Evra).

DESIGN

Pooled data of 3,319 women from three contraceptive studies of up to 13 treatment cycles; a subset of 325 women of the pooled data from warm and humid climates; and 30 women from a three-period, crossover exercise study.

SETTING

184 centers.

PATIENT(S)

3,349 healthy women.

INTERVENTION(S)

In the contraceptive studies, each treatment cycle consisted of three consecutive 7-day patches (21 days) followed by one patch-free week. During each treatment period in the exercise study, women wore the patch for 7 days and participated in one of six activities (normal activity, excluding bathing; sauna; whirlpool; treadmill; cool-water immersion; or a combination of activities) each day at a supervised health center.

MAIN OUTCOME MEASURE(S)

Patch adhesion.

RESULT(S)

In the contraceptive studies, 4.7% of patches were replaced because they fell off (1.8% [1,297 of 70,552 patches]) or became partly detached (2.9% [2,050 of 70,552 patches]); patch replacement rates in centers from a warm, humid climate were 1.7% (85 of 4,877 patches) and 2.6% (128 of 4,877 patches), respectively. Only one of 87 patches (1.1%) completely detached in the exercise study.

CONCLUSION(S)

The reliability of adhesion of the contraceptive patch is excellent and consistent across all studies; only 1.8% and 2.9% of patches required replacement due to complete or partial detachment, respectively. Heat, humidity, and exercise do not affect adhesion.