Abstract
The pharmacokinetics of SM-1652 were studied in mice, rats, rabbits, dogs, and rhesus monkeys. The plasma half-lives of SM-1652, administered intravenously at a dose of 20 mg/kg, were 11.0 min in mice, 26.0 min in rats, 65.8 min in rabbits, 72.6 min in dogs, and 150.9 min in monkeys. The 24-h urinary excretion of SM-1652 was 30 to 35% of the dose in mice and rats, 70 to 75% in rabbits and dogs, and 45% in monkeys. Biliary excretion of the antibiotic over a 24-h period was 60 and 19% in rats and rabbits, respectively; it was 19% in dogs over a 9-h period after SM-1652 administration. Approximately 95% of the intravenous dose of SM-1652 was recovered as the unchanged form in the urine and bile of rats and rabbits. The binding of SM-1652 to serum protein was 44.0% in mice, 46.0% in rats, 90.4% in rabbits, 93.2% in monkeys, 30.0% in dogs, and 96.3% in humans.
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