10.22376/ijpbs.2019.10.1.p1-12 Volume 4 Issue 1 2013 (January - March) Irradiation of sulfonamide derived oral antidiabetic drug, tolazamide (N-[(azepan-1-ylamino) carbonyl]-4-methylbenzenesulfonamide, 1) in a phosphate buffered solution under aerobic atmosphere afforded two photoproducts by cleavage of S-N and C (O)-N bonds of urea units. When irradiated with linoleic acid it photoinduced lipid peroxidation. The insignificant decrease in lipid peroxidation test under argon atmosphere indicates that tolazamide is capable of photosensitizing lipids through a process where oxygen does not play a principal role. Also the efficient inhibition of lipid peroxidation by well established radical scavenger reduced glutathione (GSH) confirmed the involvement of a type I mechanism. ANAMIKA GUPTA, WASEEM AHMAD, MOHD. REHAN ZAHEER, AND JAWAID IQBAL Tolazamide, Benzene sulfonamide, Photodegradation, Phototoxicity. 840-846