“…A large number of drugs have been reported to elicit FDEs such as trimethoprim-sulfamethoxazole, tetracyclines, penicillin, erythromycin, nonsteroidal antiinflammatory drugs, barbiturates, valproate, phenytoin, phenolphthalein, and nitroimidazoles. [ 3 ] Even though, the pathogenesis of FDE is not known, certain serum factors, antibodies, and cell mediated immunity have been attributed as causative factors. FDE is a delayed type hypersensitivity reaction mediated by CD 8+ T-cells.…”