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ABSTRACT
The ability of certain drugs and chemicals to induce cutaneous phototoxicity and DNA damage has been attributed to free radical formation during photolysis. in this context we have observed that the synergistic action of commonly used antibiotics and ultraviolet radiation (UVR) exhibited strong superoxide radical (O2) generation potential in the following order: benzylpenicillin>amphotericin> ampicillin>nystatin>spectinomycin>gentamicin. Commercially available penicillin, nystatin, ampicillin and gentamicin also generated O2 under similar conditions. the results suggest that due precaution are necessary to avoid UVR after the intake of photoreactive drugs.