AIM To research the pharmacokinetics,relative bioavailability and bioequivalence of two different valaciclovir hydrochloride tablets in human beings.METHODS A single oral dose of 600 mg of tested valaciclovir hydrochloride tablet and 500 mg of reference valaciclovir hydrochloride tablets were given repectively to 18 healthy male volunteers according to an open randomized crossover design.The acyclovir concentration in plasma was determined by a efficient HPLC-UV method.The data were analysed by DAS program....