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Objective: To examine the effects of modified Shenmai Yin on invigorating vital energy,promoting blood flow,and protection against neural impairment in an endotoxin-induced shock rat model.Methods:Ninety-six SD rats were randomly divided into four groups:sham operation (saline 20 ml/kg),shock model (lipopolysaccharide,LPS,8 mg/kg),Reformed Shengmai Yin (加味生脉饮 Pulse-activating Decoction) (LPS 8 mg/kg+reformed Shengmai Yin Injection 10 ml/kg),and dexamethasone (LPS 8 mg/kg+dexamethasone 5 mg/kg) groups.Each group was subdivided into 1 h,2 h,3 h,and 6 h time points for observation.The carotid artery was separated and connected with a biological functional system to monitor mean arterial pressure (MAP).Brain water levels,malonaldehyde (MDA) content,and superoxide dismutase (SOD) activity were also determined.Results:In the shock model group,MAP was progressively decreased after injection of LPS,brain water and MDA contents were increased,brain SOD activity was decreased,and capillary vessel edema in brain tissue was also observed.All these parameters were improved significantly in both treatment groups,although the effects were more marked with Shengmai Yin than with dexamethasone.Conclusion:Modified Shengmai Yin exhibits strong anti-shock and neuroprotective effects against Endotoxininduced shock.