Efficacy of two comparative antibiotic regimens in the treatment of serious intra-abdominal infections: results of a multicenter study.

A multicenter, open-label randomized trial was conducted to evaluate the efficacy and tolerability of monotherapy with imipenem-cilastatin (I-C) compared with combination therapy with clindamycin and an aminoglycoside (C+A) for treatment of 117 patients with serious intra-abdominal infections. Fifty-three patients (45%) received I-C and 64 patients (55%) received C+A. The overall clinical success rate was 96.2% for the I-C patients and 92.2% for the C+A patients. Clinical failure rates were 3.8% and 7.8%, respectively (P = NS). Eradication or suppression of pathogens was observed in 81.8% and 82.2% of patients, respectively. Uniform bacteriologic response was observed among all infection subgroups. Fourteen of 145 patients experienced adverse symptoms, including six of 66 (9.1%) monotherapy patients and eight of 79 (10.1%) combination-therapy patients (P = NS). The results of this study demonstrate that I-C monotherapy was as effective as C+A combination therapy for the treatment of serious intra-abdominal infections, regardless of the site or severity of infection or the clinical status of the patient. Both regimens also were found to be comparable in tolerability.