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Abraham Satanove, MD; John S. McIntosh, BSc

JAMA. 1967;200(3):209-212.

Abstract
Phototoxic reactions to thioridazine hydrochloride appear to be induced by visible light above 4,100 Angstroms as well as by ultraviolet light. Special sunscreen preparations are required to protect against these higher wavelengths of light. The critical dosage level of chlorpromazine hydrochloride required to produce a phototoxic reaction appears to be approximately 600 mg per day, while that of thioridazine hydrochloride is between 400 and 600 mg per day. It is postulated that deposition of pigment in the retina observed in patients receiving high doses of thioridazine hydrochloride (1,800 mg or higher) was due to a phototoxic reaction induced by visible light.

Author Affiliations
From the Provincial Mental Health Services of British Columbia, Canada (Dr. Satanove) and the Department of (Physical) Chemistry, University of British Columbia, Vancouver (Mr. McIntosh).

Footnotes
Read before a meeting of the Canadian Dermatological Association at Jasper, Alberta, Canada, June 30, 1966.

Reprint requests to Suite 201, 625 Fifth Ave, New Westminister, British Columbia, Canada (Dr. Satanove).

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