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The photochemical reactions in vitro of sulfamethoxazole alone and in combination with trimethoprim were studied to obtain information on the photosensitization mechanism. Sulfamethoxazole in aqueous solution, on exposure to UVB radiation, generates free radicals and singlet oxygen, with the neutral molecule being at least twice as active as the sulfamethoxazole anion. Photoexcited sulfamethoxazole...
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