Ertapenem Once Daily Versus Piperacillin‐Tazobactam 4 Times per Day for Treatment of Complicated Skin and Skin‐Structure Infections in Adults: Results of a Prospective, Randomized, Double‐Blind Multicenter Study

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Abstract
We conducted a prospective, randomized, double-blind trial comparing ertapenem (1 g once daily) with piperacillin-tazobactam (3.375 g every 6 h) as parenteral treatment for 540 adults with complicated skin and skin-structure infections. The most common diagnoses were skin or soft-tissue abscesses and lower-extremity infections associated with diabetes. The mean duration (± standard deviation) of therapy was 9.1 ± 3.1 days for ertapenem and 9.8 ± 3.3 days for piperacillin-tazobactam. At the assessment of primary efficacy end point, 10–21 days after treatment, 82.4% of those who received ertapenem and 84.4% of those who received piperacillin-tazobactam were cured. The difference in response rates, adjusting for the patients' assigned strata, was -2.0% (95% confidence interval, -10.2% to 6.2%), indicating that the response rates in the 2 treatment groups were equivalent. Cure rates for the 2 treatment groups were similar when compared by stratum, diagnosis, and severity of infection. The frequency and severity of drug-related adverse events were similar in the treatment groups.

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