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The pharmacokinetics of YM-13115, ceftriaxone, and ceftazidime were studied in rats, dogs, and rhesus monkeys (only YM-13115 and ceftriaxone were studied in rhesus monkeys). The plasma half-lives in rats were 48 min for YM-13115, 34 min for ceftriaxone, and 14 min for ceftazidime. In dogs, they were 21.9 min for YM-13115, 50.7 min for ceftriaxone, and 49.0 min for ceftazidime. In monkeys, they were 5.30 h for YM-13115 and 3.40 h for ceftriaxone. The 24-h urinary recoveries in rats were 26.7% of the dose for YM-13115, 32.0% for ceftriaxone, and 97.1% for ceftazidime. In dogs, they were 13.3% for YM-13115, 62.5% for ceftriaxone, and 86.3% for ceftazidime. In monkeys, they were 22.5% for YM-13115 and 29.3% for ceftriaxone. The 24-h biliary recoveries in rats were 72.2% for YM-13115, 61.8% for ceftriaxone, and 0.63% for ceftazidime.
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