A Study to Evaluate the Effect of Rifampicin on the Pharmacokinetics of Abiraterone in Healthy Male Participants

This is an open-label (all people know the identity of the intervention), single-center (study conducted at one site), 2-period, sequential-design (studies that combine both longitudinal and cross sectional methods), to evaluate the effects of rifampicin on the pharmacokinetics of abiraterone acetate in healthy male participants. The study consists of a screening phase, an open-label treatment phase, and a follow up phase. The screening phase will be within 14 days before the first study medication administration. The treatment phase will consist of 2 treatment periods, Period 1: a single oral dose of abiraterone acetate tablets, and Period 2: a daily oral dose of rifampicin capsules alongwith a single oral dose of abiraterone acetate tablets. The 2 periods will be separated by a washout period of at least 7 days. Blood sample collection for pharmacokinetic assessments will be done for determination of abiraterone and rifampicin concentrations. The follow up phase will be of 14 days. Safety evaluations for adverse events, clinical laboratory tests, electrocardiogram, vital signs, and physical examinations will be monitored throughout the study. The total study duration will be approximately 31 days.

Inclusion criteria

• Must have blood pressure between 90 and 140 mmHg systolic, inclusive, and no higher than 90 mmHg diastolic
• Must have a 12-lead electrocardiogram consistent with normal cardiac conduction and function
• Must sign an informed consent document indicating they understand the purpose of and procedures required for the study and are willing to participate in the study
• Must agree to use an adequate contraception method and to not donate sperm during the study and for 3 months after receiving the last dose of study medication
• Have willingness to participate in the optional pharmacogenomic component of this study, participants (or their legally acceptable representative) must have signed the informed consent form

Exclusion criteria

• History of or current clinically significant medical illness including cardiac arrhythmias or other cardiac disease, hematologic disease, coagulation disorders, lipid abnormalities, and others
• Clinically significant abnormal values for hematology or clinical chemistry at screening or at admission to the study center
• Serum testosterone level of < 200 ng/dL (at screening)
• Clinically significant renal laboratory findings including specifically, creatinine, and creatinine clearance
• Clinically significant hepatic laboratory findings or signs