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Bioequivalence Studies of a Reformulated Dutasteride and Tamsulosin Hydrochloride Combination Capsule and a Commercially Available Formulation
Journal article   Peer reviewed

Bioequivalence Studies of a Reformulated Dutasteride and Tamsulosin Hydrochloride Combination Capsule and a Commercially Available Formulation

Renee Kurczewski, Chet Bowen, David Collins, John Zhu, Gulyeter Serbest and Michael Manyak
Clinical pharmacology in drug development, v 6(5), pp 508-516
Sep 2017
PMID: 28127948

Abstract

Adult Capsules Cross-Over Studies Drug Combinations Drug Compounding - methods Dutasteride - pharmacokinetics Healthy Volunteers Humans Male Random Allocation Sulfonamides - pharmacokinetics Therapeutic Equivalency
A dutasteride 0.5 mg and tamsulosin hydrochloride 0.4 mg combination (DTC) capsule (Duodart ) was reformulated to reduce the capsule size and enhance product stability. Bioequivalence of the reformulated DTC capsule with the commercial formulation was evaluated in 2 single-dose, open-label, randomized, 2-way crossover studies in healthy adult male volunteers. Subjects in a fasted or fed state received a single oral dose of either the reformulated DTC or the commercial formulation followed by a 28-day washout period between treatments. Blood samples were taken predose and up to 72 hours postdose for pharmacokinetic (PK) analysis of dutasteride and tamsulosin serum concentrations. From the serum concentration-vs-time data, a noncompartmental method was used to calculate the maximum observed serum concentration (C ) and area under the serum concentration-time curve (AUC ) for dutasteride and tamsulosin, and AUC for tamsulosin. The 90% confidence intervals for the ratios of the C and AUC (for dutasteride and tamsulosin) and for AUC (for tamsulosin) were all completely contained within the range of 80% to 125%; therefore, the reformulated DTC capsule is bioequivalent to the commercial formulation under both fed and fasted states.

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