The Authors have been investigating the behaviour of ceftriaxone in gynecological surgery employing 1 g of the drug through intravenous injection an hour before the operation, after executing a cutaneous pomphus the night before. They obtained satisfactory results since out of 25 cases analyzed nowhere had they to intervene with other antibiotics. The drug, despite the 15 cases of infectious pathology observed, has been showing great tolerance and an utmost ease and usefulness of usage.