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March 1976, Vol 112, No. 3 >

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Article | March 1976

Factors Influencing Methoxsalen Phototoxicity in Vitiliginous Skin

Surinder K. Arora, MD; Isaac Willis, MD
Arch Dermatol. 1976;112(3):327-332. doi:10.1001/archderm.1976.01630270007002.
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• A series of experiments were conducted to determine the optimum conditions required to induce methoxsalen phototoxicity in vitiliginous skin. The results revealed that optimum phototoxicity could be obtained only when a lapse of at least 15 minutes was allowed between the application of the drug and exposure to long-wave ultraviolet light (UVA). The duration of methoxsalen's phototoxic potentiality, after its application to skin, varied in direct proportion to chemical concentration. Although a high chemical concentration and low dosage of UVA was a less time-consuming method of inducing phototoxicity, our results indicate that lower concentration and longer UVA exposure were less likely to induce undesirable blistering reactions.

(Arch Dermatol 112:327-332, 1976)

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