title: Bioequivalence of progesterone sustained release suppository in rabbits.
abstract: To study the bioequivalence of a kind of progesterone sustained release suppository, a randomized cross-over study was conducted in 12 rabbits. A single rectal dose of 2.75 mg/kg progesterone sustained released suppository (tested formulation, T) and progesterone suppository (reference formulation, R) was administered; a multiple dose of 2.75 mg/kg was given up to seven times with an interval of 8 h. Concentrations in serum were determined by a competitive enzyme immunoassay. The main parameters of T were: for single and multiple doses, Cmax was 48.8 +/- 11.8 ng/mL and 43.5 +/- 9.4 ng/mL, Tmax was 0.5 +/- 0.3 h and 0.4 +/- 0.3 h, AUC(0-24 h) was 362.4 +/- 143 ng x h x mL(-1) and 310.6 +/- 70.3 ng x h x mL(-1), respectively. The relative bioavailability of T to R were (104.2 +/- 13.4)% and (111.4 +/- 19.1)%, respectively. Statistical analysis showed that the two formulations were bioequivalent and T had sustained released feature.
authors.affiliation: Department of Pharmacology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
authors.forename: Lihong
authors.initials: L
authors.lastname: Long
authors.forename: Qun
authors.initials: Q
authors.lastname: Huang
authors.forename: Minghui
authors.initials: M
authors.lastname: Wu
authors.forename: Shuxian
authors.initials: S
authors.lastname: Hou
authors.forename: Zongshun
authors.initials: Z
authors.lastname: Dai
mesh_terms: D000285:Administration, Rectal; D000818:Animals; D001682:Biological Availability; D018592:Cross-Over Studies; D005260:Female; D011374:Progesterone / Q000008:administration & dosage / Q000493:pharmacokinetics*; D011817:Rabbits; D011897:Random Allocation; D013488:Suppositories
chemical_list: D013488:Suppositories; D011374:Progesterone