Pharmacokinetics of the Soluble Guanylate Cyclase Stimulator Riociguat in Healthy Young Chinese Male Non-Smokers and Smokers: Results of a Randomized, Double-Blind, Placebo-Controlled Study.

Abstract:

BACKGROUND AND OBJECTIVES:The aim of this study was to investigate the pharmacokinetics, safety, and tolerability of riociguat after single and multiple oral doses of 1 or 2 mg three times daily (tid), and to determine the effect of smoking on riociguat pharmacokinetics in Chinese men. METHODS:In a randomized, double-blind, placebo-controlled, single-center study stratified for smokers and non-smokers, healthy Chinese men aged 18-45 years received two riociguat doses: Dose Step 1 (1 mg) then Dose Step 2 (2 mg) conducted after the safety and tolerability at Dose Step 1 was confirmed. For each step, 12 subjects received riociguat and six received placebo. A single dose was given on Day 1, followed by a 48-h pharmacokinetic profile. Multiple-dose treatment tid was then given for 6 days (Days 3-8), with a last single dose on Day 9, followed by a 72-h pharmacokinetic profile. Primary outcomes were pharmacokinetic parameters for riociguat after single and multiple dosing. RESULTS:Thirty-six subjects (18 smokers; 18 non-smokers) were randomized and provided valid pharmacokinetic data. Riociguat and its pharmacologically active metabolite M1 (BAY 60-4552) showed nearly dose-proportional pharmacokinetics. Accumulation was minimal in smokers and approximately two-fold in non-smokers. Exposure for riociguat was decreased by ≥60% in smokers. No serious or significant adverse events occurred during the study. CONCLUSIONS:Riociguat pharmacokinetics showed dose proportionality in healthy Chinese men, as previously demonstrated in healthy white male individuals. Exposure to riociguat was substantially decreased in smokers compared with non-smokers. Riociguat was well tolerated in Chinese men.

journal_name

Clin Pharmacokinet

authors

Zhao X,Wang Z,Wang Y,Zhang H,Blode H,Yoshikawa K,Becker C,Unger S,Frey R,Cui Y

doi

10.1007/s40262-015-0337-4

subject

Has Abstract

pub_date

2016-05-01 00:00:00

pages

615-24

issue

5

eissn

0312-5963

issn

1179-1926

pii

10.1007/s40262-015-0337-4

journal_volume

55

pub_type

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