Porphyrias are a group of inherited or acquired enzyme disorders of the heme biosynthetic pathway that result in overproduction of porphyrins or porphyrin precursor compounds. These are rare disorders. All forms of porphyria together afflict fewer than 200,000 people in the U.S. Porphyrias are split into two categories – acute (eg, acute intermittent porphyria) or cutaneous (porphyria cutanea tarda).

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Last Update: January 2019