title: Inhibition of photosensitivity in erythropoietic protoporphyria with terfenadine.
abstract: The effect of terfenadine on the response to irradiation with blue light was measured in seven patients with erythropoietic protoporphyria. Terfenadine caused significant inhibition of the immediate flare reaction, but did not alter the erythemal response localized to the irradiation sites. Treatment with beta-carotene had no effect on the flare and erythemal responses. However, the flare reaction was still inhibited by terfenadine during treatment with beta-carotene. These results show that histamine release is involved in the mechanism of porphyrin photosensitivity. H1 receptor antagonists may be of use in the treatment of patients with erythropoietic protoporphyria.
authors.affiliation: Department of Dermatology, Royal Victoria Infirmary, Newcastle upon Tyne, U.K.
authors.forename: P M
authors.initials: PM
authors.lastname: Farr
authors.forename: B L
authors.initials: BL
authors.lastname: Diffey
authors.forename: J N
authors.initials: JN
authors.lastname: Matthews
mesh_terms: D000293:Adolescent; D000328:Adult; D001559:Benzhydryl Compounds / Q000627:therapeutic use*; D002338:Carotenoids / Q000627:therapeutic use; D002648:Child; D004359:Drug Therapy, Combination; D004920:Erythropoiesis / Q000502:physiology*; D006634:Histamine H1 Antagonists / Q000627:therapeutic use*; D006801:Humans; D008297:Male; D010787:Photosensitivity Disorders / Q000097:blood / Q000188:drug therapy*; D011164:Porphyrias / Q000097:blood / Q000188:drug therapy*; D011524:Protoporphyrins / Q000097:blood; D016593:Terfenadine; D019207:beta Carotene
chemical_list: D001559:Benzhydryl Compounds; D006634:Histamine H1 Antagonists; D011524:Protoporphyrins; D019207:beta Carotene; D002338:Carotenoids; D016593:Terfenadine