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Aim: Nitric oxide (NO) plays an important role in the pathogenesis of endotoxic shock.The present work tested the hypothesis that ketanserin could attenuate endotoxic shock by inhibiting the expression of iNOS.Methods and Results: The results demonstrated that ketanserin could inhibit iNOS expression in the heart,lungs, liver and kidneys and nitrate production in the serum upon endotoxic shock in mice.