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Effects of age and gender on the pharmacokinetics of the soluble guanylate cyclase stimulator riociguat
© Frey et al; licensee BioMed Central Ltd. 2013
Published: 29 August 2013
Pulmonary hypertension is a disabling disease associated with high mortality [1, 2]. Riociguat (under review for the treatment of pulmonary hypertension) stimulates soluble guanylate cyclase, which plays an important role in the regulation of cardiovascular tone and remodelling [3–9]. We investigated the potential effects of age and gender on the pharmacokinetics of riociguat and its primary metabolite M1 (BAY 60-4552). Safety and tolerability of riociguat were also assessed.
This placebo-controlled, double-blind, single-centre study followed good clinical practice guidelines. Healthy volunteers were randomized into four groups according to age (young, 18–45 years; elderly, 64.5–80 years) and gender: young male (YM), elderly male (EM), young female (YF), elderly female (EF). All participants received a single oral tablet of riociguat 2.5 mg or placebo. Dense sampling was performed for pharmacokinetics.
Forty-seven participants provided data for pharmacokinetic and safety analyses. Nine participants in each group received riociguat; three participants in each of the YM, EM and EF groups and two participants in the YF group received placebo.
Selected pharmacokinetic parameters of riociguat and metabolite M1 (BAY 60-4552) by age and gender following a single oral dose of riociguat 2.5 mg
Young female (n = 9)
Elderly female (n = 9)
Young male (n = 9)
Elderly male (n = 9)
Comparison of selected riociguat and M1 pharmacokinetic parameters between different participant groups (ratios and 90% confidence limits)
Elderly vs young (n = 18 per group)
Female vs male (n = 18 per group)
Across age groups, pharmacokinetics of M1 followed similar trends to those of riociguat, although differences were less pronounced (Tables 1 & 2). Compared with the combined placebo subgroups, the combined riociguat subgroups demonstrated an expected reduction in mean blood pressure and corresponding elevation of mean heart rate, waning approximately 16 hours post-dose. Three participants in the riociguat subgroups reported drug-related adverse events, one of which (hypotension) was classified as severe. All adverse events had resolved by completion of the study.
Age and gender had modest effects on riociguat and M1 pharmacokinetics, and the safety profile of riociguat was similar across all groups. Thus, no dose adjustment for age or gender is merited.
We thank Miguel Zinny, Maryellen Fitzgerald, Arthur LaFluer and Carolyn Maloney of ProMedica Clinical Research Center, Inc., and Christa Rotolo, Pavur Sundaresan and Arthur Mazzu of Bayer HealthCare Pharmaceutical Division for their contributions to the conduct of the study. Writing support was provided by Esther Illman of Oxford PharmaGenesis™ Ltd, and was funded by a research grant from Bayer Pharma AG.
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