No clinically meaningful pharmacokinetic interaction between the hepatitis C virus inhibitors elbasvir and grazoprevir and the oral contraceptives ethinyl estradiol and levonorgestrel.

William L Marshall, Hwa-Ping Feng, Luzelena Caro, Jennifer Talaty, Zifang Guo, Xiaobi Huang, Deborah Panebianco, Joanne Ma, Eric Mangin, Terry E O'Reilly, Joan R Butterton, Wendy W Yeh

European journal of clinical pharmacology 2017 May

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Oral contraceptive pills (OCPs) are an important element of hepatitis C virus (HCV) treatment in women of childbearing potential. These studies evaluated the safety and pharmacokinetic interactions between elbasvir (EBR) and grazoprevir (GZR) and ethinyl estradiol/levonorgestrel (EE/LNG). Both studies were open-label, single-site, two-period, fixed-sequence, one-way interaction studies. In period 1, subjects received one tablet of EE/LNG (0.03 mg/0.15 mg). In period 2, subjects received EBR (50 mg once daily) for 13 days or GZR (200 mg once daily) for 10 days, with one tablet of EE/LNG on day 7 (GZR group) or 10 (EBR group). Each study enrolled 20 healthy, nonsmoking adult females. There was no clinically meaningful effect of multiple doses of EBR or GZR on the pharmacokinetics of EE or LNG. Geometric mean ratios (GMRs) for AUC0-∞ and Cmax in the presence and absence of EBR were 1.01 and 1.10 for EE and 1.14 and 1.02 for LNG, with 90% confidence intervals (CIs) that were contained in the interval [0.80, 1.25]. Similarly, the AUC0-∞ and Cmax GMRs in the presence and absence of GZR were 1.10 and 1.05 for EE and 1.23 and 0.93 for LNG, respectively. The 90% CIs for EE AUC0-∞ and for EE and LNG Cmax were contained in the interval [0.80, 1.25]; however, the 90% CI for the LNG AUC0-∞ [1.15, 1.32] slightly exceeded the upper bound. These results suggest that EBR/GZR can be co-administered to female patients with HCV of childbearing potential who are on OCPs to prevent pregnancy.

Citation

William L Marshall, Hwa-Ping Feng, Luzelena Caro, Jennifer Talaty, Zifang Guo, Xiaobi Huang, Deborah Panebianco, Joanne Ma, Eric Mangin, Terry E O'Reilly, Joan R Butterton, Wendy W Yeh. No clinically meaningful pharmacokinetic interaction between the hepatitis C virus inhibitors elbasvir and grazoprevir and the oral contraceptives ethinyl estradiol and levonorgestrel. European journal of clinical pharmacology. 2017 May;73(5):593-600