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  • Title: Persistent light reactivity from systemic quinine.
    Author: Guzzo C, Kaidbey K.
    Journal: Photodermatol Photoimmunol Photomed; 1990 Aug; 7(4):166-8. PubMed ID: 2076372.
    Abstract:
    A 41-year-old black female with psoriasis developed photosensitivity and a Koebner reaction while receiving phototherapy. She had been receiving oral quinine intermittently for muscle cramps. Photobiological evaluation revealed a strongly positive photopatch test to quinine sulfate and a marked persistent reduction in the minimal erythema dose to solar-simulated radiation in the uninvolved skin. There were no abnormal reactions to UVA. The photosensitivity is still present 3 years after the withdrawal of quinine. These features are similar to those observed previously in persistent light reactors to topical photosensitizers.
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