Pharmacokinetics and safety of trovafloxacin in healthy male volunteers following administration of single intravenous doses of the prodrug, alatrofloxacin

Fifteen healthy male volunteers (in four groups) received single 1 h iv infusions of alatrofloxacin (CP-116,517) equivalent to 30, 100, 200 or 300 mg of its active metabolite, trovafloxacin (CP-99,219). Blood and urine were sampled over 73 and 72 h, respectively, and plasma levels of alatrofloxacin and serum concentrations of trovafloxacin were determined by HPLC with UV detection. Alatrofloxacin was not detectable in plasma samples collected after the end of infusion, indicating rapid conversion to trovafloxacin. Maximum serum concentrations of trovafloxacin were achieved at the end of the infusions. Mean maximum plasma trovafloxacin concentrations for the four alatrofloxacin doses were 0.4, 1.8, 2.3 and 4.3 mg/L. The mean area under the concentration-time curve increased proportionally with the dose. The elimination half-life (T-1/2) for trovafloxacin was independent of the dose and the mean T(1/2)s for the 100, 200 and 300 mg equivalent doses of alatrofloxacin were 10.4, 12.3 and 10.8 h. Approximately 10% of the equivalent dose was recovered as unchanged trovafloxacin in the urine. No clinical adverse or laboratory reactions were associated with iv administration of alatrofloxacin and its conversion to trovafloxacin, These results indicate that alatrofloxacin is rapidly converted to trovafloxacin and that the pharmacokinetic parameters for this new fluoroquinolone after iv administration of its parent compound are similar to those reported after oral administration of equivalent trovafloxacin doses.