Rifamycin antibakterielle midler (rifampicin, rifabutin), visse antiepileptika (phenytoin, carbamazepin, phenobarbital, primidon), efavirenz og cimetidin:
Rifamycin-Antibiotika (Rifampicin, Rifabutin), bestimmte Antiepileptika (Phenytoin, Carbamazepin, Phenobarbital, Primidon), Efavirenz und Cimetidin: