Doribax has been studied in five main studies that compared Doribax with other antibiotics: • two studies compared Doribax with piperacillin/ tazobactam or imipenem in a total of 979 patients with nosocomial pneumonia; • two studies compared Doribax with meropenem in a total of 962 patients with complicated infections in the abdomen; • one study compared Doribax with levofloxacin in 753 patients with complicated urinary tract infections.