A study to assess possible drug-drug interactions between MDV3100 and gemfibrozil and MDV3100 and Itraconazole.

Inclusion Criteria:

• Body weight of at least 65.0 kg and no greater than 85.0 kg.
• Body Mass Index (BMI) of at least 18.5 and no greater than 30.0 kg/m2.

Exclusion Criteria:

• Known or suspected hypersensitivity to MDV3100, itraconazole, gemfibrozil, any components of the formulations used, or any history of liver toxicity with other drugs.
• Confirmed CYP2C8 PM status based on genotyping analysis.
• Any of the liver function tests above the upper limit of normal. A retest to confirm the result may be performed once.
• History of seizure, including any febrile seizure, loss of consciousness, or transient ischemia attack within 12 months prior to enrollment (Day 1 visit), or any condition that may pre-dispose to seizure (e.g., prior stroke, brain arteriovenous malformation, head trauma with loss of consciousness requiring hospitalization).
• Any clinically significant history of asthma, eczema, any other allergic condition or previous severe hypersensitivity to any drug (excluding non-active hay fever).
• Abnormal pulse and/or blood pressure (BP) measurements at the pre-study visit as follows: Pulse <40 or >90 bpm; mean systolic BP >140 mmHg ; mean diastolic BP >90 mmHg (BP measurements taken in triplicate after subject has been resting in supine position for 5 min; pulse will be measured automatically).
• A QTc interval of >430 ms after repeated measurements (consistently after duplicate measurements), a history of unexplained syncope, cardiac arrest, unexplained cardiac arrhythmias or torsades de pointes, structural heart disease, or a family history of Long QT Syndrome (LQTS).
• Regular use of any inducer of metabolism (e.g. barbiturates, rifampin) in the 3 months prior to admission to the Clinical Unit.
• Positive serology test for HBsAg, anti HAV (IgM), anti-HCV or anti-HIV 1+2.