Tuyển tập các báo cáo nghiên cứu khoa học quốc tế về bệnh thú y đề tài: Lack of bioequivalence of two oxytetracycline formulations in the rabbit | J. Vet. Sci. 2002 3 1 25-30 JOURNAL OF Veterinary Science Lack of bioequivalence of two oxytetracycline formulations in the rabbit W. Chong . Kim . Kim . Han and . Ryu Department of Pharmacology College of Veterinary Medicine and School of Agricultural Biotechnolog Seoul National University Suwon 441-744 Korea ABSTRACT Oxytetracycline OTC has been used for over 40 years in veterinary medical field. Various forms of oxytetracycline preparations have been marketed but little information is available on the bioequivalence of OTC preparations. This study was conducted to evaluate the bioequivalence of two OTC powder preparations available in Korea. Fourteen rabbits were randomly allocated into two groups. During the first period a dose 200 mg kg of reference product was orally administered to the rabbits in Group A and test product to those in Group B. After 7-day washout period the reterence and test products were given in group B and A respectively. Blood samples were drawn at 17 points during 48 hours after administration and plasma OTC concentrations were measured by using HPLC. The solution concentrations of OTC dissolved from two products were not significantly different in the dissolution test. The mean area under the curve AUG - and peak plasma concentration Cmax values for test and reference OTCs were and pg h ml and p g ml respectively. The realtive bioavailability and Cmax of test product to those of reference product was and respectively. The ranges of AUC and Cmax of test drug compared to those of reference drug under 90 confidence limits were 27 104 and 28 respectively. The results of statistical analysis indicate that the two pivotal pharmacokinetic parameters AUC and Cmax of test product are not within the 20 of those of the reference suggesting that the test OTC is not bioequivalent to the reference OTC. Key word oxytetracycline pharmacokinetics bioequi- Corresponding author Pan Dong .
