Abstract
Amoxicillin, a well-known antibiotic, has a broad spectrum against gram-negative and gram-positive bacteria. This experiment was conducted in order to investigate the effect of micronized and non-micronized amoxicillin prepared using different comminution techniques on change in blood concentration of rats. Forty adult male Sprague Dawley rats (6~7 weeks of age, body weight 128.3 ± 10.7 g) were randomly allocated to two treatment groups: micronized amoxicillin (MA) group treated with micronized amoxicillin trihydrate powder (particle size, over 90% of 10 ㎛), non-micronized amoxicillin (NMA) group treated with non-micronized amoxicillin trihydrate powder (particle size, over 70% of 100 ㎛), given 480 mg/kg body weight once daily for four days. The results showed a significant increase in serum concentration in the MA group on days 3 and 4, compared to the NMA group (P＜0.05). In particular, serum concentration of the MA group on day 4 was increased almost two times that of the NMA group. The results indicate that due to the increase of the drug’s oral bioavailability, higher serum concentration would be achieved with the micronized amoxicillin trihydrate than with the non-micronized drug.
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