OBJECTIVE To establish a LC/MS test method for determining the concentration of thiorphan(TP,the active metabolite of racecadotril) in thehuman plasma,the pharmacokinetics and bioequivalence of two racecadotril pulvis(10mg,30mg) and racecadotril granule(10mg) inhealthyhuman body.METHODS A single oral dose 300mg of three preparations was randomly given to 18healthy volunteers in a three cycle duplex 3×3 latin square crossover design.The concentration of TP in plasma,which was an active metabolite of racecado...