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This study was conducted to determine the safety, tolerability, and pharmacokinetics of intravenous doses of ceftaroline fosamil administered in combination with the novel non-β-lactam β-lactamase inhibitor avibactam in healthy adults. In the single-dose, open-label arm, 12 subjects received single 1-h intravenous infusions of ceftaroline fosamil alone (600 mg), avibactam alone (600 mg), and ceftaroline fosamil in combination with avibactam (600/600 mg) separated by 5-day washout periods. In the multiple-dose, placebo-controlled, double-blind arm, 48 subjects received intravenous infusions of ceftaroline fosamil/avibactam at 600/600 mg every 12 h (q12h), 400/400 mg q8h, 900/900 mg q12h, 600/600 mg q8h, or placebo for 10 days. Ceftaroline and avibactam levels in plasma and urine were measured by liquid chromatography coupled with tandem mass spectrometry. No significant differences in systemic exposure of ceftaroline or avibactam were observed when the drugs were administered alone versus concomitantly, indicating that there was no apparent pharmacokinetic interaction between ceftaroline fosamil and avibactam administered as a single dose. No appreciable accumulation of either drug occurred with multiple intravenous doses of ceftaroline fosamil/avibactam, and pharmacokinetic parameters for ceftaroline and avibactam were similar on days 1 and 10. Infusions of ceftaroline fosamil/avibactam were well tolerated at total daily doses of up to 1,800 mg of each compound, and all adverse events (AEs) were mild to moderate in severity. Infusion-site reactions were the most common AEs reported with multiple dosing. The pharmacokinetic and safety profiles of ceftaroline fosamil/avibactam demonstrate that the 2 drugs can be administered concomitantly to provide an important broad-spectrum antimicrobial treatment option.

antimicrobial agents and chemotherapy

Single- and Multiple-Dose Study To Determine the Safety, Tolerability, and Pharmacokinetics of Ceftaroline Fosamil in Combination with Avibactam in Healthy Subjects