Objective:To investigate the pharmacokinetics of clindamycin phosphate vaginal gel in healthy Chinese female volunteers.Methods:Ten healthy Chinese female volun- teers were intravaginally given with 5.0g of clindamycin phosphate vaginal gel (equivalent to 100mg of clindamycin) once for single dose treatment,and 5.0g,once a day for 3 days,for mul- tiple dose treatment.The serum concentration of clindamycin were determined by HPLC-MS method and its pharmacokinetic parameters of clindamycin were calculated by DAS 1.0 soft- ware.Results:The main pharmacokinetic parameters of clindamycin for single dose and multiple doses were as follows:t_(1/2) were (15.30±2.62) hours and (14.78±2.49) hours,Tmax were (4.88±0.94) hours and (4.70±0.59) hours,Cmax were (38.30±22.77) ng/ml and (44.87±26.71) ng/ml,AUC0_(-∞) were (783.45±351.19) ng·ml~(-1)·h~(-1) and (1015.68±456.95) ng·ml~(-1)·h~(-1),respectively.Conclusion:The Cmax of clindamycin phosphate vaginal gel after a single dose and multiple doses are obviously lower and t_(1,2) are longer than that of clindamycin phosphate oral preparations,which suggests that clindamycin phosphate vaginal gel acts locally and can be slowly absorbed to circulation for systemic actions. Objective: To investigate the pharmacokinetics of clindamycin phosphate vaginal gel in healthy Chinese female volunteers. Methods: Ten healthy Chinese female volun- teers were intravaginally given with 5.0 g of clindamycin phosphate vaginal gel (equivalent to 100 mg of clindamycin) once for single dose treatment, and 5.0g, once a day for 3 days, for mul- tiple dose treatment. The serum concentration of clindamycin were determined by HPLC-MS method and its pharmacokinetic parameters of clindamycin were calculated by DAS 1.0 soft-ware. Results: The main pharmacokinetic parameters of clindamycin for single dose and multiple doses were as follows: t_ (1/2) were (15.30 ± 2.62) hours and (14.78 ± 2.49) hours, (4.88 ± 0.94) hours and (4.70 ± 0.59) AUC0_ (- ∞) were (783.45 ± 351.19) ng · ml -1 · h -1 and (1015.68 ±) were significantly higher in Cmax were (38.30 ± 22.77) ng / ml and (44.87 ± 26.71) ng / 456.95 ng · ml -1 · h -1, respectively.Conclusion: The Cmax of clindamycin phosphate vaginal gel after a single dose and mult iple doses are obviously lower and t_ (1,2) are longer than that of clindamycin phosphate oral preparations, which suggests that clindamycin phosphate vaginal gel acts locally and can be slowly absorbed to circulation for systemic actions.