What other drugs will affect efavirenz?
There are many other medicines that can interact with efavirenz, or make it less effective. Before taking efavirenz, tell your doctor if you are using any of the following drugs: • St. John’s wort; • a blood thinner such as warfarin (Coumadin); • a cholesterol medication such as Lipitor or Zocor; • an antibiotic such as clarithromycin (Biaxin), itraconazole (Sporanox), rifabutin (Mycobutin), or rifampin (Rifadin, Rifater, Rifamate, Rimactane); • heart or blood pressure medications such as amlodipine (Norvasc), diltiazem (Tiazac, Cartia, Cardizem), felodipine (Plendil), nicardipine (Cardene), nifedipine (Procardia, Adalat), or verapamil (Calan, Covera, Isoptin, Verelan); • other HIV medicines such as amprenavir (Agenerase), indinavir (Crixivan), lopinavir/ritonavir (Kaletra), nevirapine (Viramune), ritonavir (Norvir), or saquinavir (Invirase); or • seizure medications such as phenytoin (Dilantin) or carbamazepine (Tegretol). This list is not complete and there are other drugs that can i
