<Li> Sulfonylureas like glibenclamide, gliclazide and glimepiride, although glipizide is thought to be safe . </Li> <Li> Barbiturates including thiopental, phenobarbital, primidone, etc . </Li> <Li> Systemic treatment with antifungals including fluconazole, griseofulvin, ketoconazole and voriconazole . (Topical use of these agents is thought to be safe due to minimal systemic absorption .) </Li> <Li> Some anesthetics like ketamine and etomidate . </Li>

The most common cause of acquired porphyria is