• Sauzanne G Khalilieh, Ka Lai Yee, Li Fan, Rachael Liu, Walter Heber, Elise Dunzo, Ilias Triantafyllou, Azra Hussaini, and Marian Iwamoto.
• Merck & Co., Inc., RY34-A500, 126 E Lincoln Avenue, Rahway, NJ, 07065, USA. sauzanne.khalilieh@merck.com.
• Clin Drug Investig. 2017 Oct 1; 37 (10): 975-984.

IntroductionDoravirine is a novel HIV-1 non-nucleoside reverse transcriptase inhibitor exhibiting a robust safety and efficacy profile in combination with other antiretrovirals. While existing data do not suggest that doravirine delays cardiac repolarization, the aim of this trial was to evaluate the effects of a supratherapeutic dose of doravirine on the heart-rate corrected QT (QTc) interval in healthy adults.MethodsA randomized, three-period, crossover, placebo-controlled trial was conducted in healthy adults, 18-55 years of age. Three treatments were administered: single-dose doravirine 1200 mg, placebo, and positive control (single-dose moxifloxacin 400 mg). QT interval measurements were collected at serial time points following treatment administration. Clinically significant placebo-corrected, baseline-adjusted QTc interval prolongation was defined when the upper bound of the two-sided 90% confidence interval (CI) for the mean effect on double delta QTc exceeded 10 ms. Doravirine tolerability and pharmacokinetics were also evaluated.ResultsForty-five subjects were enrolled and 39 completed the study per protocol. Fridericia's QT correction for heart rate was demonstrated to be inadequate; therefore, a population-specific correction was applied (QTcP). Assay sensitivity was confirmed with moxifloxacin. Following doravirine administration, QTc intervals did not exceed the pre-specified significance threshold - upper 90% CIs were ≤5.42 ms across all time points. Categorical analyses identified no outliers or clinically meaningful deviations. Doravirine geometric mean area under the time-concentration curve from dosing until 24 h post-dose (AUC0-24) and maximum plasma concentration (C max) were 119 µM·h and 9240 nM, respectively, which exceeded values expected following therapeutic dose administration of doravirine 100 mg, even in the setting of intrinsic and extrinsic factors that may cause increases in doravirine concentrations. All treatments were generally well tolerated.ConclusionA single oral supratherapeutic dose of doravirine 1200 mg does not cause clinically meaningful QTc interval prolongation in healthy adults.

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