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KMID : 0369820100400010051
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Jorunal of Korean Pharmaceutical Sciences
2010 Volume.40 No. 1 p.51 ~ p.57
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Bioequivalence of Losata Tablet to Cozaar Tablet (Losartan Potassium 50 mg) using HPLC with Fluorescence Detector
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Kang Hyun-Ah
Kim Se-Mi
Yoo Dong-Jin
Kang Seung-Rae
Lee Sang-No
Kim Yong-Hee
Lee Yong-Bok
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Abstract
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Losartan potassium, 2-butyl-4-chloro-1-[p-(o-1H-tetrazol-5-ylphenyl)benzyl]imidazole-5-methanol mono-potassium salt, is a new class of antihypertensive agents, and is an antagonist in angiotensin receptor. The purpose of the present study was to evaluate the bioequivalence of two Losartan potassium tablets, Cozaar tablet (MSD Pharmaceutical Co., Ltd.) and Losata tablet (Kyung Dong Pharmaceutical Co., Ltd.), according to the guidelines of the Korea Food and Drug Administration (KFDA). The release of losartan from the two losartan potassium formulations in vitro was tested using KP VIII Apparatus II method with various dissolution media. Twenty eight healthy male subjects, years in age and in body weight, were divided into two groups and a randomized cross-over study was employed. After a single tablet containing 50 mg as losartan potassium was orally administered, blood samples were taken at predetermined time intervals, and the concentrations of losartan in serum were determined using HPLC with fluorescence detector. The dissolution profiles of two formulations were similar in all tested dissolution media. The pharmacokinetic parameters such as , and were calculated, and Equiv Test/K-BE Test 2002 was utilized for the statistical analysis of the parameters using logarithmically transformed , and untransformed . The results showed that the differences between two formulations based on the reference drug, Cozaar, were -2.70%, 1.45% and 2.31% for , and , respectively. There were no sequence effects between two formulations in these parameters. The 90% confidence intervals using logarithmically transformed data were within the acceptance range of log 0.8 to log 1.25 (e.g., log 0.8852~log 1.0655 and log 0.8319~log 1.2342 for and , respectively). Thus, the criteria of the KFDA bioequivalence guideline were satisfied, indicating Losata tablet was bioequivalent to Cozaar tablet.
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KEYWORD
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Losartan potassium, Cozaar tablet, Losata tablet, Bioequivalence, HPLC
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