- Receiving any medications or substances that are inducers of CYP3A4; use of the following inducers are prohibited =< 7 days prior to randomization: efavirenz (Sustiva), nevirapine (Viramune), carbamazepine (Carbatrol, Epitol, Equetro, Tegretol, Tegretol-XR), modafinil (Provigil), phenobarbital (Luminal), phenytoin (Dilantin, Phenytek), pioglitazone (Actos), rifabutin (Mycobutin), rifampin (Rifadin), St. John?s wort