Porphyria, Acute Hepatic, also known as porphobilinogen synthase deficiency, is related to variegate porphyria and harderoporphyria, and has symptoms including vomiting and muscle weakness. An important gene associated with Porphyria, Acute Hepatic is ALAD (Aminolevulinate Dehydratase). The drugs Ethanol and Pharmaceutical Solutions have been mentioned in the context of this disorder. Affiliated tissues include liver and skin, and related phenotypes are abnormal circulating enzyme concentration or activity and constipation