coproporphyria /kop′rōpôrfir″ē·ə/ [Gk, kopros + porphyros, purple] , a rare autosomal-dominant metabolic disorder in which large quantities of nitrogenous substances, called porphyrins, are excreted in the feces. Attacks, with varying GI and neurological symptoms, may be precipitated by certain drugs, including barbiturates, sulfonamides, and steroids. Patients are often helped by a high-carbohydrate diet. Also called hereditary coproporphyria. See also acute intermittent porphyria, coproporphyrin, porphyria.
