A carotenoid that is a precursor of vitamin a. It is administered to reduce the severity of photosensitivity reactions in patients with erythropoietic protoporphyria (porphyria, erythropoietic). (From Reynolds JEF(Ed): Martindale: The Extra Pharmacopoeia (electronic version). Micromedex, Inc, Engewood, CO, 1995.)


Symptoms and diagnosis

Symptoms:

    


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