Influence of multiple initiatives in Sweden to enhance ARB prescribing efficiency following generic losartan; findings and implications for other countries

Trends in Antihypertensive Medicine Utilization in the Republic of Srpska, Bosnia and Herzegovina: An Eleven-Year Follow-Up

Background: In last 2 decades, there have been substantial changes in the utilization patterns of antihypertensive medicines following new clinical trials and the introduction of new treatment guidelines. The aim of this study was to analyze utilization and prescribing patterns regarding antihypertensive medicines in the Republic of Srpska, Bosnia and Herzegovina during an 11-years follow-up according to national and European treatment guidelines.

Methods: In this retrospective, observational study, medicine utilization data were analyzed between 2009–2019 period using the ATC/DDD methodology and expressed as the number of DDD/1,000 inhabitants/day (DID/TID). The medicine utilization 90% (DU90%) method was used for determine the quality of prescribing.

Results: During the observed period, the use of antihypertensive medicines increased more than 3-times (125.97 DDD/TID in 2009 vs 414.95 DDD/TID in 2019), corresponding to a rise in the prevalence of hypertensive patients from 91.7/1,000 to 186.3/1,000 in the same period. This was mainly driven by increased use of angiotensin converting enzyme inhibitors with 241.69%, beta blockers with 146.87%, calcium channel blockers with 251.55%, and diuretics with 178.95%. Angiotensin receptor blockers were the fastest growing group of antihypertensive medicines in this period and their utilization increased nearly 40 times.

Conclusions: The overall antihypertensive medicines utilization was largely influenced by national and ESH/ESC guidelines and strongly corresponded to the positive medicine list of the national health insurance fund. Antihypertensive medicines utilization is comparable with medicine utilization trends in other countries.

Utilisation Trend of Long-Acting Insulin Analogues including Biosimilars across Europe: Findings and Implications

BACKGROUND

Diabetes mellitus rates and associated costs continue to rise across Europe enhancing health authority focus on its management. The risk of complications is enhanced by poor glycaemic control, with long-acting insulin analogues developed to reduce hypoglycaemia and improve patient convenience. There are concerns though with their considerably higher costs, but moderated by reductions in complications and associated costs. Biosimilars can help further reduce costs. However, to date, price reductions for biosimilar insulin glargine appear limited. In addition, the originator company has switched promotional efforts to more concentrated patented formulations to reduce the impact of biosimilars. There are also concerns with different devices between the manufacturers. As a result, there is a need to assess current utilisation rates for insulins, especially long-acting insulin analogues and biosimilars, and the rationale for patterns seen, among multiple European countries to provide future direction. Methodology. Health authority databases are examined to assess utilisation and expenditure patterns for insulins, including biosimilar insulin glargine. Explanations for patterns seen were provided by senior-level personnel.

RESULTS

Typically increasing use of long-acting insulin analogues across Europe including both Western and Central and Eastern European countries reflects perceived patient benefits despite higher prices. However, activities by the originator company to switch patients to more concentrated insulin glargine coupled with lowering prices towards biosimilars have limited biosimilar uptake, with biosimilars not currently launched in a minority of European countries. A number of activities were identified to address this. Enhancing the attractiveness of the biosimilar insulin market is essential to encourage other biosimilar manufacturers to enter the market as more long-acting insulin analogues lose their patents to benefit all key stakeholder groups.

CONCLUSIONS

There are concerns with the availability and use of insulin glargine biosimilars among European countries despite lower costs. This can be addressed.

Evidence-based public policy making for medicines across countries: findings and implications for the future

Aim: Global expenditure on medicines is rising up to 6% per year driven by increasing prevalence of non-communicable diseases (NCDs) and new premium priced medicines for cancer, orphan diseases and other complex areas. This is difficult to sustain without reforms. Methods: Extensive narrative review of published papers and contextualizing the findings to provide future guidance. Results: New models are being introduced to improve the managed entry of new medicines including managed entry agreements, fair pricing approaches and monitoring prescribing against agreed guidance. Multiple measures have also successfully been introduced to improve the prescribing of established medicines. This includes encouraging greater prescribing of generics and biosimilars versus originators and patented medicines in a class to conserve resources without compromising care. In addition, reducing inappropriate antibiotic utilization. Typically, multiple measures are the most effective. Conclusion: Multiple measures will be needed to attain and retain universal healthcare.

Key Issues Surrounding Appropriate Antibiotic Use for Prevention of Surgical Site Infections in Low- and Middle-Income Countries: A Narrative Review and the Implications

BACKGROUND

There is a concern with the growing use of antimicrobials across countries increasing antimicrobial resistance (AMR) rates. A key area within hospitals is their use for the prevention of surgical site infections (SSI) with concerns with timing of the first dose, which can appreciably impact on effectiveness, as well as duration with extended prophylaxis common among low- and middle-income countries (LMICs). This is a concern as extended duration increases utilization rates and AMR as well as adverse events. Consequently, there is a need to document issues of timing and duration of surgical antibiotic prophylaxis (SAP) among LMICs together with potential ways forward to address current concerns.

METHODS

Narrative review of timings and duration of SAP among LMICs combined with publications documenting successful approaches to improve SAP to provide future direction to all key stakeholder groups.

RESULTS

There were documented concerns with the timing of the first dose of antibiotics, with appropriate timing as low as 6.7% in Egypt, although as high as 81.9% in Turkey. There was also an extensive duration of SAP, ranging from long duration times in all patients in a study in Nigeria with a mean of 8.7 days and 97% of patients in Egypt to 42.9% of patients in Pakistan and 35% in Turkey. Successful interventions to improve SAP typically involved multiple approaches including education of all key stakeholder groups, monitoring of usage against agreed guidelines,as well as quality targets. Multiple approaches typically improved timing and duration as well as reduced costs. For instance, in one study appropriateness increased from 30.1% to 91.4%, prolonged duration reduced to 5.7% of patients, and mean costs of antibiotics decreased 11-fold.

CONCLUSION

There are considerable concerns with the timing and duration of SAP among LMICs. Multiple interventions among LMICs can address this providing future directions.

Effects of pay-for-performance on prescription of hypertension drugs among public and private primary care providers in Sweden

This study exploits policy reforms in Swedish primary care to examine the effect of pay-for-performance (P4P) on compliance with hypertension drug guidelines among public and private health care providers. Using provider-level outcome data for 2005-2013 from the Swedish Prescription Register, providers in regions using P4P were compared to providers in other regions in a difference-in-differences analysis. The results indicate that P4P improved guideline compliance regarding prescription of angiotensin converting enzyme inhibitors and angiotensin receptor blockers. The effect was mainly driven by private providers, suggesting that policy makers should take ownership into account when designing incentives for health care providers.

Ongoing initiatives within the Scottish National Health Service to affect the prescribing of selective serotonin reuptake inhibitors and their influence

Aim: Increasing use of selective serotonin-reuptake inhibitors (SSRIs) in Scotland, coupled with safety concerns with some SSRIs, and the increasing availability of generic SSRIs, have resulted in multiple initiatives to improve the quality and efficiency of their prescribing in Scotland. Our aim is to assess their influence to provide future direction. Materials & methods: The prescription costs analysis database was used to document utilization and expenditure on SSRIs between 2001 and 2017 alongside documenting the initiatives. Results: Multiple interventions over the years increased international nonproprietary name prescribing up to 99.9% lowering overall costs. This, coupled with initiatives to limit escitalopram prescribing due to concerns with its value, resulted in a 73.7% reduction in SSRI expenditure between 2001 and 2017 despite a 2.34-fold increase in utilization. Safety warnings resulted in a significant reduction in the prescribing of paroxetine, citalopram and escitalopram alongside a significant increase in sertraline Conclusion: Multiple initiatives have increased the quality and efficiency of SSRI prescribing in Scotland providing direction to others.

An evaluation of prescribing trends and patterns of claims within the Preferred Drugs Initiative in Ireland (20112016): an interrupted time-series study

OBJECTIVE

To examine the impact of the Preferred Drugs Initiative (PDI), an Irish health policy aimed at enhancing evidence-based cost-effective prescribing, on prescribing trends and the cost of prescription medicines across seven medication classes.

DESIGN

Retrospective repeated cross-sectional study spanning the years 2011-2016.

SETTING

Health Service Executive Primary Care Reimbursement Service pharmacy claims data for General Medical Services (GMS) patients, approximately 40% of the Irish population.

PARTICIPANTS

Adults aged ≥18 years between 2011 and 2016 are eligible for the GMS scheme.

PRIMARY AND SECONDARY OUTCOMES

The percentage of PDI medications within each drug class per calendar quarter. Linear regression was used to model prescribing of the preferred drug within each medication group and to assess the impact of PDI guidelines and other relevant changes in prescribing practice. Savings in drug expenditure were estimated.

RESULTS

Between 2011 and 2016, around a quarter (23.59%) of all medications were for single-agent drugs licensed in the seven drug classes. There was a small increase in the percentage of PDI drugs, increasing from 4.64% of all medications in 2011 to 4.76% in 2016 (P<0.001). The percentage of preferred drugs within each drug class was significantly higher immediately following publication of the guidelines for all classes except urology, with the largest increases noted for lansoprazole (1.21%, 95% CI: 0.84% to 1.57%, P<0.001) and venlafaxine (0.71%, 95% CI: 0.15% to 1.27%, P=0.02). Trends in prescribing of the preferred drugs between PDI guidelines and the end of 2016 varied between drug classes. Total cost savings between 2013 and 2016 were estimated to be €2.7 million.

CONCLUSION

There has been a small increase in prescribing of PDI drugs in response to prescribing guidelines, with inconsistent changes observed across therapeutic classes. These findings are relevant where health services are seeking to develop more active prescribing interventions aimed at changing prescribing practice.

Effect of audit and feedback with peer review on general practitioners' prescribing and test ordering performance: a cluster-randomized controlled trial

BACKGROUND

Much research worldwide is focussed on cost containment and better adherence to guidelines in healthcare. The research focussing on professional behaviour is often performed in a well-controlled research setting. In this study a large-scale implementation of a peer review strategy was tested on both test ordering and prescribing behaviour in primary care in the normal quality improvement setting.

METHODS

We planned a cluster-RCT in existing local quality improvement collaboratives (LQICs) in primary care. The study ran from January 2008 to January 2011. LQICs were randomly assigned to one of two trial arms, with each arm receiving the same intervention of audit and feedback combined with peer review. Both arms were offered five different clinical topics and acted as blind controls for the other arm. The differences in test ordering rates and prescribing rates between both arms were analysed in an intention-to-treat pre-post analysis and a per-protocol analysis.

RESULTS

Twenty-one LQIC groups, including 197 GPs working in 88 practices, entered the trial. The intention-to-treat analysis did not show a difference in the changes in test ordering or prescribing performance between intervention and control groups. The per-protocol analysis showed positive results for half of the clinical topics. The increase in total tests ordered was 3% in the intervention arm and 15% in the control arm. For prescribing the increase in prescriptions was 20% in the intervention arm and 66% in the control group. It was observed that the groups with the highest baseline test ordering and prescription volumes showed the largest improvements.

CONCLUSIONS

Our study shows that the results from earlier work could not be confirmed by our attempt to implement the strategy in the field. We did not see a decrease in the volumes of tests ordered or of the drugs prescribed but were able to show a lesser increase instead. Implementing the peer review with audit and feedback proved to be not feasible in primary care in the Netherlands.

TRIAL REGISTRATION

This trial was registered at the Dutch trial register under number ISRCTN40008171 on August 7^th 2007.

Influence of initial angiotensin receptor blockers on treatment persistence in uncomplicated hypertension: A nation-wide population-based study

We identified 55 504 uncomplicated, treatment-naïve hypertensive patients who started angiotensin II receptor blockers (ARBs) in 2012 from national claims data. The proportion of patients remaining on any hypertension treatment at 12 months and the adherence rate were similar between the losartan cohort (66.82% and 68.25%) and the nonlosartan ARB cohort (67.48% and 69.01%). After adjusting for confounding factors, there was no difference in persistence (aHR 0.98, 95% confidence interval (CI) 0.95-1.01) on hypertension treatment between losartan and nonlosartan ARB cohort. Post hoc analysis showed that patients initially prescribed eprosartan, irbesartan (both, aHR 1.33), and telmisartan (aHR 1.11) were more likely to discontinue the initial drug, whereas valsartan initiators (aHR 0.96) were less likely compared with losartan initiators.

Analysis of the influence of recent reforms in China: cardiovascular and cerebrovascular medicines as a case history to provide future direction

BACKGROUND

Pharmaceutical expenditure has grown by 16% per annum in China, enhanced by incentives for physicians and hospitals. Hospital pharmacies dispense 80% of medicines in China, accounting for 46% of total hospital expenditure. Principal measures to moderate drug expenditure growth include pricing initiatives as limited demand-side measures.

OBJECTIVE

Assess current utilization and expenditure including traditional Chinese medicines (TCMs) between 2006 and 2012.

METHODS

Uncontrolled retrospective study of medicines to treat cardiovascular and cerebrovascular diseases in one of the largest hospitals in southwest China.

RESULTS

Utilization increased 3.3-fold for cerebrovascular medicines, greatest for TCMs, with expenditure increasing 4.85-fold. Low prices for generics were seen, similar to Europe. However, there was variable utilization of generics at 29-31% of total product volumes in recent years. There continued to be irrationality in prescribing with high use of TCMs, and the utilization of different medicines dropping significantly once they achieved low prices.

CONCLUSION

Prices still have an appreciable impact on utilization in China. Potential measures similar to those implemented among western European countries could improve prescribing rationality and conserve resources.

Effects of drug price reduction and prescribing restrictions on expenditures and utilisation of antihypertensive drugs in Korea

OBJECTIVES

To evaluate the quantitative effects of the drug price reduction on pharmaceutical expenditures and the new guidelines to restrict prescribing on drug utilisation for antihypertensive drugs.

DESIGN

We used an interrupted time series design with the National patient sample data of Health Insurance Review and Assessment Service in South Korea.

METHODS

54,295 participants who were with primary hypertension from the National patient sample data of Health Insurance Review and Assessment Service were included. The study period was from March 2011 to December 2013. The dependent variables were antihypertensive drug costs, antihypertensive drug cost per prescribing day, daily drug utilisation, average number of drugs per month, percentage of original drugs per prescription, drug overutilisation and prohibited combinations. Segmented regression analysis was used.

RESULTS

The drug price reduction reduced expenditure (US$-1.51, -10.2%), and the new guidelines reduced expenditures even more (US$-2.13; -16.2%). These policies saved US$4.22 (28%) of antihypertensive drug costs per patient in December 2013 compared to March 2012. Drug price reduction policy was introduced in April 2012. We established the policy effect by comparing it before (March 2012) with after(21 months later-December 2012). The effects of the guidelines decreased expenditures, daily drug utilisation and the average number of drugs per month more than did the drug price reduction.

CONCLUSIONS

Both policies saved money. The guidelines were more effective over time and had fewer side effects such as increasing daily drug utilisation and number of drugs than the effects of drug price reduction.

Switching among Equivalents in Chronic Cardiovascular Therapies: 'Real World' Data from Italy

Since August 2012, Italian general practitioners are required to prescribe the generic name of medicines, except for refill of chronic therapy. We evaluated the extent of switching among equivalents in chronic cardiovascular therapies, the influence of the 2012 regulatory intervention and of patient-related or drug-related factors. Prescriptions of off-patent anti-arrhythmics, oral antidiabetics and ACE inhibitors dispensed from August 2011 to August 2013 within the Bologna Local Health Authority (870,000 inhabitants) was collected. The rate of actual switching among equivalents was evaluated monthly. The effect of the regulatory intervention was estimated by interrupted-time-series analysis. Adjusted odds ratios (aORs) of switching were calculated for the following: age, gender, number of different equivalents available for each drug and change in dispensing pharmacy between subsequent refills. The average monthly rates of switches were 9.6%, 16.3% and 16.3% for anti-arrhythmics, antidiabetics and ACE inhibitors, respectively. Values significantly increased soon after the regulatory intervention for ACE inhibitors (+1.81%, p < 0.01), anti-arrhythmics (+1.46%, p = 0.01) and antidiabetics (+1.09%, p = 0.01), and no significant decreasing trends were observed in the following 12 months. For all drug classes, odd of switching was higher in case of change in dispensing pharmacy (up to aOR = 4.31, 95 CI = 4.26-4.35 for ACE inhibitors) and availability of ≥5 different equivalents (up to aOR = 7.82, 95 CI = 7.39-8.28 for antidiabetics). Switching was lower for age ≥65 for antidiabetics and ACE inhibitors (aOR = 0.92, 95 CI = 0.90-0.93; 0.87, 0.86-0.88, respectively). The Italian regulatory intervention generated an immediate increase, not sustained in time, in switching among equivalents of cardiovascular therapies. Young age, high number of available equivalents and changes in dispensing pharmacy between subsequent refills were associated with switching.

Key Components of Increased Drug Expenditure in South Korea: Implications for the Future

BACKGROUND

The cost of pharmaceuticals has increased rapidly in Korea in recent years. Expenditure is likely to grow further with the policy of expanding National Health Insurance coverage for the following four disease areas: cerebrovascular and cardiovascular disease, rare diseases, and cancer. Consequently, there is a need to analyze the different components leading to this increased expenditure as a basis for suggesting future reforms in Korea.

OBJECTIVE

To quantify the impact of new and established drugs on the growth of total drug spending in South Korea in recent years, specially focusing on the differentiated components of drug spending. These include treatment expansion and drug-mix effects (switching from cheaper drugs to expensive ones and vice versa).

METHODS

A model was proposed and used to assess the impact of both new and existing drugs on changes in price, quantity, and drug mix over the 5-year period in Korea from 2006 to 2010. The database used was the National Health Insurance claims data, which covers about 97% of the total population of Korea.

RESULTS

Overall drug spending increased 1.43-fold from 2006 to 2010. Drug-mix effect (ε_t = 1.32) was the main factor contributing to increased drug spending, followed by increased drug utilization (Q_t = 1.26). For existing drugs, treatment expansion (Q_I) and drug-mix effect (ε_I) were measured at 1.28 and 1.24, respectively, while those of new drugs were 1.02 (Q_N) and 1.03 (ε_N). Therefore, existing drugs have a much greater effect on drug spending than do new drugs. According to the Anatomical Therapeutic Classification, drug spending rose most significantly for the "sensory organs" class of drugs (E_t = 1.78) followed by the "various" class (E_t = 1.68). For existing drugs in the sensory organs class (S), drug-mix effect (ε_I) was measured at 0.96. This implies that expensive drugs among existing drugs were replaced by cheaper ones. However, the quantity prescribed (Q_I) substantially increased by 1.88-fold. New drugs within this class that were more expensive than existing ones were also prescribed (ε_N = 1.09), further increasing drug expenditure in Korea.

CONCLUSIONS

We found contrasting results from previous studies. The drug-mix effect and existing drugs made the largest contribution to drug spending growth rather than new drugs. Policies targeting drug mix, such as promoting cost-effective prescription and rational use of drugs, including the use of cheaper cost generics without compromising care, should be primarily considered to help contain future drug expenditure.

Review of ongoing initiatives to improve prescribing efficiency in China; angiotensin receptor blockers as a case history

INTRODUCTION

Pharmaceutical expenditure is rising by 16% per annum in China and is now 46% of total expenditure. Initiatives to moderate growth include drug pricing regulations and encouraging international non-proprietary name prescribing. However, there is no monitoring of physician prescribing quality and perverse incentives.

OBJECTIVES

Assess changes in angiotensin receptor blocker (ARB) utilization and expenditure as more generics become available; compare findings to Europe.

METHODOLOGY

Observational retrospective study of ARB utilization and expenditure between 2006 and 2012 in the largest hospital in Chongqing district.

RESULTS

Variable and low use of generics versus originators with a maximum of 31% among single ARBs. Similar for fixed dose combinations. Prices typically reduced over time, greatest for generic telmisartan (-54%), mirroring price reductions in some European countries. However, no preferential increase in prescribing of lower cost generics. Accumulated savings of 33 million CNY for this large provider if they adopted European practices.

CONCLUSION

Considerable opportunities to improve prescribing efficiency in China.

Different initiatives across Europe to enhance losartan utilization post generics: impact and implications

Introduction: There is an urgent need for health authorities across Europe to fully realize potential savings from increased use of generics to sustain their healthcare systems. A variety of strategies were used across Europe following the availability of generic losartan, the first angiotensin receptor blocker (ARB) to be approved and marketed, to enhance its prescribing vs. single-sourced drugs in the class. Demand-side strategies ranged from 100% co-payment for single-sourced ARBs in Denmark to no specific measures. We hypothesized this heterogeneity of approaches would provide opportunities to explore prescribing in a class following patent expiry.

Objective: Contrast the impact of the different approaches among European countries and regions to the availability of generic losartan to provide future guidance.

Methodology: Retrospective segmented regression analyses applying linear random coefficient models with country specific intercepts and slopes were used to assess the impact of the various initiatives across Europe following the availability of generic losartan. Utilization measured in defined daily doses (DDDs). Price reductions for generic losartan were also measured.

Results: Utilization of losartan was over 90% of all ARBs in Denmark by the study end. Multiple measures in Sweden and one English primary care group also appreciably enhanced losartan utilization. Losartan utilization actually fell in some countries with no specific demand-side measures. Considerable differences were seen in the prices of generic losartan.

Conclusion: Delisting single-sourced ARBs produced the greatest increase in losartan utilization. Overall, multiple demand-side measures are needed to change physician prescribing habits to fully realize savings from generics. There is no apparent “spill over” effect from one class to another to influence future prescribing patterns even if these are closely related.

Measures to improve angiotensin receptor blocker prescribing efficiency in the UK: findings and implications

BACKGROUND

Generic losartan provides an opportunity to enhance angiotensin receptor blocker (ARB) prescribing efficiency, with all ARBs essentially being similar. Initially, there was limited activity in NHS Bury (UK). This changed in March 2011 with therapeutic switching and other measures encouraging the prescribing of losartan following generics to enhance its utilization versus patented ARBs.

AIM

This study aims to assess the impact of multiple measures on losartan utilization, its price and total ARB expenditure.

METHODS

An interrupted time series analysis was performed. Utilization was measured as prescription items dispensed, typically 28 days.

RESULTS

No immediate change in losartan utilization was observed following generics. This changed after the multiple initiatives with losartan accounting for 65% of all single ARB items dispensed by the study end. ARB expenditure was 59% below prestudy levels by the study end, which was helped by a 92% reduction in expenditure per item for losartan. Annual net savings from the program were estimated at just under GB£290,000, which is over eight-times the cost of implementation.

CONCLUSION

Multiple measures can enhance prescribing efficiency. Health authorities cannot rely on a 'spillover' effect from other classes in order to affect changes in physician prescribing habits.

Multiple policies to enhance prescribing efficiency for established medicines in Europe with a particular focus on demand-side measures: findings and future implications

INTRODUCTION

The appreciable growth in pharmaceutical expenditure has resulted in multiple initiatives across Europe to lower generic prices and enhance their utilization. However, considerable variation in their use and prices.

OBJECTIVE

Assess the influence of multiple supply and demand-side initiatives across Europe for established medicines to enhance prescribing efficiency before a decision to prescribe a particular medicine. Subsequently utilize the findings to suggest potential future initiatives that countries could consider.

METHOD

An analysis of different methodologies involving cross national and single country retrospective observational studies on reimbursed use and expenditure of PPIs, statins, and renin-angiotensin inhibitor drugs among European countries.

RESULTS

Nature and intensity of the various initiatives appreciably influenced prescribing behavior and expenditure, e.g., multiple measures resulted in reimbursed expenditure for PPIs in Scotland in 2010 56% below 2001 levels despite a 3-fold increase in utilization and in the Netherlands, PPI expenditure fell by 58% in 2010 vs. 2000 despite a 3-fold increase in utilization. A similar picture was seen with prescribing restrictions, i.e., (i) more aggressive follow-up of prescribing restrictions for patented statins and ARBs resulted in a greater reduction in the utilization of patented statins in Austria vs. Norway and lower utilization of patented ARBs vs. generic ACEIs in Croatia than Austria. However, limited impact of restrictions on esomeprazole in Norway with the first prescription or recommendation in hospital where restrictions do not apply. Similar findings when generic losartan became available in Western Europe.

CONCLUSIONS

Multiple demand-side measures are needed to influence prescribing patterns. When combined with supply-side measures, activities can realize appreciable savings. Health authorities cannot rely on a "spill over" effect between classes to affect changes in prescribing.

Can authorities appreciably enhance the prescribing of oral generic risperidone to conserve resources? Findings from across Europe and their implications

BACKGROUND

Generic atypical antipsychotic drugs offer health authorities opportunities for considerable savings. However, schizophrenia and bipolar disorders are complex diseases that require tailored treatments. Consequently, generally there have been limited demand-side measures by health authorities to encourage the preferential prescribing of generics. This is unlike the situation with hypertension, hypercholaesterolaemia or acid-related stomach disorders.The objectives of this study were to compare the effect of the limited demand-side measures in Western European countries and regions on the subsequent prescribing of risperidone following generics; to utilise the findings to provide future guidance to health authorities; and where possible, to investigate the utilisation of generic versus originator risperidone and the prices for generic risperidone.

METHODS

Principally, this was a segmented regression analysis of retrospective time-series data of the effect of the various initiatives in Belgium, Ireland, Scotland and Sweden following the introduction of generic risperidone. The study included patients prescribed at least one atypical antipsychotic drug up to 20 months before and up to 20 months after generic risperidone. In addition, retrospective observational studies were carried out in Austria and Spain (Catalonia) from 2005 to 2011 as well as one English primary care organisation (Bury Primary Care Trust (PCT)).

RESULTS

There was a consistent steady reduction in risperidone as a percentage of total selected atypical antipsychotic utilisation following generics. A similar pattern was seen in Austria and Spain, with stable utilisation in one English PCT. However, there was considerable variation in the utilisation of generic risperidone, ranging from 98% of total risperidone in Scotland to only 14% in Ireland. Similarly, the price of generic risperidone varied considerably. In Scotland, generic risperidone was only 16% of pre-patent loss prices versus 72% in Ireland.

CONCLUSION

Consistent findings of no increased prescribing of risperidone post generics with limited specific demand-side measures suggests no 'spillover' effect from one class to another encouraging the preferential prescribing of generic atypical antipsychotic drugs. This is exacerbated by the complexity of the disease area and differences in the side-effects between treatments. There appeared to be no clinical issues with generic risperidone, and prices inversely reflected measures to enhance their utilisation.

Impact of delisting ARBs, apart from losartan, on ARB utilisation patterns in Denmark: implications for other countries

INTRODUCTION

Renin-angiotensin inhibitor drugs have been a target for health authority initiatives across Europe with the potential for substantial savings once generic angiotensin-converting enzyme inhibitors (ACEIs) became available without compromising care. Recently, losartan was the first angiotensin receptor blocker (ARB) to lose its patent. In Denmark, the authorities removed all other ARBs from the reimbursement list, apart from losartan, as they were all seen as essentially similar for the management of hypertension or congestive heart failure at appropriate doses, but more expensive. Similarly, all other ARB fixed-dose combinations (FDCs), apart from losartan, were removed from the reimbursement list.

OBJECTIVE

The aims of the study were to (i) assess the impact of these reimbursement changes on the subsequent utilisation of losartan and other ARBs alone or as FDCs; (ii) assess changes in the prices of losartan and other ARBs post-generic losartan to calculate potential savings; and (iii) compare the impact of the policies in Denmark with other European countries to provide guidance.

METHODOLOGY

This was a retrospective segmented regression analysis of an interrupted time-series design comparing utilisation patterns before and after the changes in ARB reimbursement status. Utilisation was measured in defined daily doses (DDDs). Changes in total expenditure and expenditure/DDD were also assessed over time.

RESULTS

Losartan utilisation grew from 31 to 33 % of total single ARB utilisation before generic losartan, to 93 % by October 2011. There was a corresponding decrease in the utilisation of all other ARBs. Both changes were significant (p < 0.001). Total expenditure on single ARBs in 2011 was 77 % below 2009 levels despite a 16 % increase in utilisation. Estimated savings were 290.5 million Danish Kroner (DKK). A similar trend was seen for losartan FDCs, which was also significant (p < 0.001).

DISCUSSION

Losartan utilisation grew appreciable following the changes. The change was much greater than seen in countries that had eased prescribing restrictions for losartan but not the other ARBs. Active therapeutic switching programmes plus education and financial incentives also significantly enhanced losartan utilisation following generics in two countries and regions; however, the increase in losartan utilisation was less than that seen in Denmark.

Generic atypical antipsychotic drugs in Belgium: their influence and implications

Introduction: Generic atypical antipsychotic drugs should be a focus of attention given their expenditure. However, there is a recognized need to tailor treatments. There were no specific measures in Belgium to enhance the prescribing of oral risperidone following generics in January 2008. Prescribing restrictions have remained for long-acting risperidone injections throughout. Objective: Assess changes in risperidone utilization before and after oral generics were reimbursed, as well as the utilization and expenditure of the various risperidone preparations. Method: Principally a retrospective observational study and interrupted time series design. Results: As expected, no increased utilization of oral risperidone after generics. Both originator and generic oral risperidone prescribed, with the originator reducing its price. Generic risperidone was 59% below prepatent loss prices by September 2012. Conclusion: Authorities cannot rely on a ‘spill over’ of learning from other disease areas to affect changes in physician prescribing habits. Specific measures are needed to encourage generic risperidone where appropriate. However, their influence will be limited by the complexity of the disease area.

Changes in the utilization of venlafaxine after the introduction of generics in Sweden

BACKGROUND

There has been an appreciable increase in the prescribing efficiency of proton pump inhibitors, statins, and renin-angiotensin inhibitor drugs in Sweden in recent years. This has been achieved through multiple reforms encouraging the prescription of generics at low prices versus patented drugs in the same class. Generic venlafaxine also presents an opportunity to save costs given the prevalence of depression. However, depression is more complex to treat, with physicians reluctant to change prescriptions if patients are responding to a particular antidepressant.

OBJECTIVES

We assessed (a) changes in the utilization pattern of venlafaxine versus other newer antidepressants before and after the availability of generic venlafaxine and before and after the initiation of prescription restrictions for duloxetine limiting its prescription to refractory patients, (b) utilization of generic versus original venlafaxine after its availability, and (c) price reductions for generic venlafaxine and the subsequent influence on total expenditure on newer antidepressants over time.

METHODOLOGY

We performed interrupted time series analysis of changes in monthly reimbursed prescriptions using defined daily doses (DDDs) of patients dispensed at least one newer antidepressant from January 2007 to August 2011. DDDs was defined as the average maintenance dose of a drug when used in its major indication in adults. This included 19 months after the availability of generic venlafaxine and before initiation of prescription restrictions for duloxetine to 13 months after prescription restrictions. Total expenditure and expenditure/DDD for venlafaxine were measured over time.

RESULTS

No appreciable change in the utilization pattern for venlafaxine was observed after generic availability when no appreciable demand-side activities by the regions (counties) were implemented to encourage its use. The utilization of venlafaxine significantly increased after prescription restrictions for duloxetine. Generic venlafaxine was dispensed once available, reaching 99.6 % of total venlafaxine (DDD basis) by August 2011. There was an appreciable fall in expenditure for newer antidepressants in Sweden after generic venlafaxine despite increased utilization, helped by a 90 % reduction in expenditure/DDD for venlafaxine by the end of the study versus prepatent loss prices.

CONCLUSION

Multiple demand-side measures are needed to change physician prescribing habits. Authorities should not rely on a spillover effect between drug classes to effect change. Limited influence of prescription restrictions on the subsequent utilization of duloxetine reflects the complexity of this disease area. This is exacerbated by heterogeneous indications for duloxetine.