The following is from Wikipedia. They are triggers for porphyria.
Sulfonamides, including sulfadiazine, sulfasalazine and trimethoprim/sulfamethoxazole.
Sulfonylureas like glibenclamide, gliclazide and glimepiride, although glipizide is thought to be safe.
Barbiturates including thiopental, phenobarbital, primidone, etc.
Systemic treatment with antifungals including fluconazole, griseofulvin, ketoconazole and voriconazole. Although topical use of these agents is thought to be safe due to minimal systemic absorption.
Some anaesthetics like ketamine and etomidate.
Certain Antibiotics like rifapentine, rifampicin, rifabutine, nitrofurantoin and possibly, metronidazole.
Ergot derivatives including dihydroergotamine, ergometrine, ergotamine, methysergide, etc.
Certain antiretroviral medications (e.g. indinavir, nevirapine, ritonavir, saquinavir, etc.), progestogens,
Some anticonvulsants including: carbamazepine, phenytoin and perhaps, valproate.
Miscellaneous others including: oxycodone, pentazocine, cocaine, gold antirheumatic agents like sodium aurothiomalate, methyldopa, fenfluramine, ethosuximide, flupentixol, flutamide, disulfiram, lidocaine, etc.
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