(for example, phenobarbital), carbamazepine (Tegretole is one brand of this drug), and phenytoin (Dilantine is one brand of this drug), primidone (Mysolines), topiramate (Topamaks), phenylbutazone (Butazolidine is one brand), some drugs used for HIV such as ritonavir (Norvire), modafinil (Provigin and p