Abstract: AimTo study the excretion of (-)-clausenamide in rats. MethodsThe urine, feces and bile were collected at predetermined time points after (-)-clausenamide was orally administrated to 6 rats (30 mg·kg^-1). The concentrations of (-)-clausenamide and its metabolite 6-OH-(-)-clausnamide were determined by HPLC-MS/MS method using glipzide as the internal reference, and the accumulative excretion amount of (-)-clausenamide and 6-OH-(-)-clausenamide was calculated in the urine, feces and bile, separately. Results(-)-Clausenamide was recovered mostly (44%) from feces in 112 hours, 7.1% was found from urine in 120 hours and 0.013% was detected from bile in 24 hours. The accumulative excretions of 6-OH-(-)-clausenamide were 0.92%, 0.46% and 0.0003% of the administered dose from feces, urine and bile, respectively. ConclusionThe major amount of (-)-clausenamide was recovered from feces after (-)-clausenamide was orally administrated to rats (30 mg·kg^-1).