Influence of drug-drug interactions on effectiveness and safety of direct-acting antivirals against hepatitis C virus

Impact of potential multiple drug-drug interactions on the adverse event profile of patients with hepatitis C treated with pangenotypic direct-acting antivirals in Spain

OBJECTIVES

Direct-acting antivirals (DAAs) share pharmacokinetic pathways with many comedications commonly administered to patients living with chronic hepatitis C virus (HCV) infection (PLWHCV). International guidelines recommend a thorough drug-drug interaction (DDI) risk assessment prior to starting DAA therapy and before starting comedications. This study aims to evaluate the impact of potential multiple DDIs in the real-life adverse event (AE) profile of PLWHCV treated with DAAs.

MATERIAL AND METHOD

This is a retrospective, observational study using electronic medical records. Patients included were PLWHCV and were treated with either the protease inhibitor (PI) free DAA sofosbuvir/velpatasvir (SOF/VEL) or glecaprevir/pibrentasvir (GLE/PIB) between 2017 and 2020. Potential (single and multiple) DDIs were identified using the Liverpool HEP Interaction Checker. AEs potentially associated to DDIs were identified during DAA treatment period.

RESULTS

1620 patients with DAA prescriptions (SOF/VEL or GLE/PIB) were included. Of these, 123 were predicted to have multiple DDIs (multi-DDI). About 10% (123/1256) of the patients receiving ≥2 comedications were at risk of multi-DDI with DAA. Most comedication-associated AEs were recorded in this multi-DDI population (88.9%, 16/18), meaning that 13% (16/123) of the multi-DDI population suffered AEs. According to DAA regimen, more comedication-associated AEs were reported in GLE/PIB-treated as compared with SOF/VEL-treated patients (18.3% [13/71] vs 5.8% [3/52] p<0.05). These AEs were mainly reported by primary care physicians (62.5%).

DISCUSSION

PLWHCV predicted to have multiple DDIs are at high risk of AEs. Moreover, fewer comedication-associated AEs were identified with the PI-free DAA SOF/VEL as compared with GLE/PIB.

Italian Real-World Analysis of the Impact of Polypharmacy and Aging on the Risk of Multiple Drug-Drug Interactions (DDIs) in HCV Patients Treated with Pangenotypic Direct-Acting Antivirals (pDAA)

Purpose

The study aims at investigating the impact of polymedication and aging in the prevalence of multiple drug-drug interactions (DDIs) on HCV patients treated with sofosbuvir/velpatasvir (SOF/VEL) or glecaprevir/pibrentasvir (GLE/PIB).

Patients and Methods

This is a retrospective analysis based on administrative data covering around 6.9 million individuals. Patients treated with SOF/VEL or GLE/PIB over November 2017-March 2020 were included. Index date corresponded to SOF/VEL or GLE/PIB first prescription during such period; patients were followed up for treatment duration. Analyses were then focused on patients with ≥2 comedications at risk of multiple DDIs. The severity and the effect of multiple DDI were identified using the Liverpool University tool.

Results

A total of 2057 patients with SOF/VEL and 2128 with GLE/PIB were selected. Mean age of SOF/VEL patients was 58.5 years, higher than GLE/PIB ones (52.5 years) (p < 0.001), and patients >50 years were more present in SOF/VEL vs GLE/PIB cohorts: 72% vs 58%, (p < 0.001). Most prescribed co-medications were cardiovascular, alimentary and nervous system drugs. Proportion of patients with ≥2 comedications was higher in SOF/VEL compared to GLE/PIB cohort (56.5% vs 32.3%, p < 0.001). Those at high-risk of multiple DDIs accounted for 11.6% (N = 135) of SOF/VEL and 19.6% (N = 135) of GLE/PIB (p < 0.001) patients with ≥2 comedications. Among them, the potential effect of DDI was a decrease of DAA serum levels (11% of SOF/VEL and GLE/PIB patients) and an increased concentration of comedication serum levels (14% of SOF/VEL and 42% of GLE/PIB patients).

Conclusion

This real-world analysis provided a thorough characterization on the burden of polymedication regimens in HCV patients treated with SOF/VEL or GLE/PIB that expose such patients to an increased risk of DDIs. In our sample population, SOF/VEL regimen was more frequently detected on elderly patients and on those with ≥2 comedications at risk of multi-DDI, ie, among patients characterized by higher rates of comorbidities and polypharmacy.

Efficacy and safety of ledipasvir/sofosbuvir for hepatitis C among drug users: a systematic review and meta-analysis

BACKGROUND AND AIMS

Limited data is available on the efficacy of direct acting anti-viral drugs on hepatitis C in drug users. The aim of this meta-analysis was to comprehensively analyze the efficacy and safety of LDV/SOF in drug users infected with the hepatitis C virus (HCV).

METHODS

The PubMed, Cochrane library, Embase and Web of Science databases were searched for articles published till April 2021 on HCV-positive drug users who were treated with ledipasvir/sofosbuvir (LDV/SOF). The primary endpoint was pooled sustained virological response at 12 weeks (SVR12) with 95% confidence interval (95% CI). Funnel plots and Egger's test were used to assess the publication bias.

RESULTS

A total of 12 studies and 711 subjects treated with LDV/SOF-based regimen for HCV were included, and the pooled SVR12 rate was 89.8% (95% CI 85.9-92.7). The pooled SVR12 rate of genotype 1 drug users was 92.4% (95% CI 88.6-95.0). Subgroup analysis showed that pooled SVR12 rates of patients treated with LDV/SOF and LDV/SOF ± RBV were 89.2% (95% CI 83.4-93.1), 90.4% (95% CI 83.6-94.5) respectively. In addition, the SVR12 rates were 88% (95% CI 70.7-95.7) for 8 weeks, 89.9% (95% CI 81.0-94.9) for 12 weeks and 82.2% (95% CI 24.9-98.5) for 24 weeks of treatment.

CONCLUSION

LDV/SOF is a safe and relatively effective treatment for hepatitis C in drug users.