Eighty four patients with various infections were treated with parenteral ampicillin and sulbactam. Twenty seven patients had meningitis five septic arthritis and osteomyelitis, two systemic salmonellosis, nine intrathoracic infections, five of which were complicated with pleural empyema; thirty patients had infection of the deep tissues of the neck, and the remaining eleven had soft tissue infection in different localizations. The clinical and microbiological results were interpreted together and the overall rate of success in treatment with ampicillin and sulbactam was found to be 98.8%.