title: Quinidine photosensitivity.
abstract: Photodermatitis occurring in three patients taking oral quinidine sulfate cleared when the drug was discontinued and recurred when it was readministered. The dermatitis was experimentally reproduced with long-wave ultraviolet light (UV-A, 320-400 nm) in these three patients, who also exhibited a decreased minimal erythema dose (MED) to hot quartz irradiation. Patients taking quinidine who had no dermatitis exhibited normal MEDs and normal response to UV-A. Normal subjects injected intradermally with quinidine and irradiated with UV-A showed no reaction. These observations indicate that the photosensitive dermatitis to quinidine that occurred in the three patients is idiosyncratic and that the UV-A is at least partially responsible for the development of the dermatitis that correlates with the absorption of quinidine in the UV-A range. Quinidine must be considered among the drugs that can produce photosensitive dermatitis.
mesh_terms: D000368:Aged; D003875:Drug Eruptions / Q000209:etiology*; D004342:Drug Hypersensitivity / Q000209:etiology; D006801:Humans; D008297:Male; D010787:Photosensitivity Disorders / Q000139:chemically induced*; D011802:Quinidine / Q000009:adverse effects*; D014466:Ultraviolet Rays
chemical_list: D011802:Quinidine