[Drugs and porphyric crisis]

Life threatening crisis may accompany some varieties of porphyria like the acute intermittent form, coproporphyria, porphyria variegata and that associated to deficiency of porphobilinogen synthetase. Drugs are commonly involved as precipitating factors. A classification of drugs according to their proven or probable triggering effect is offered in this paper. Insufficient information precludes the classification of some drugs.