In this randomized, two phase crossover study, 30 healthy Caucasian subjects were
enrolled based on CYP2C8 *3 genotype (n = 15, CYP2C8 *1/*1; n = 15, CYP2C8 *3
carriers). Subjects received a single 15 mg dose of pioglitazone or gemfibrozil 600 mg
every 12 h for 4 days with a single 15 mg dose of pioglitazone administered on the
morning of day 3. A 48 h pharmacokinetic study followed each pioglitazone dose and
the study phases were separated by a 14 day washout period.