Clinical effect and excretion into wound exudate of a new semisynthetic cephalosporin cefroxadine (CXD), were studied. CXD was given in 25 cases of surgical infections; 6 cases of wound infection, 9 cases of abscess, 9 cases of infected atheroma and 1 case of furuncle. CXD was orally administered in daily dose of 750 to 1,500 mg. Clinical results were excellent in 1 case, good in 18 cases, fair in 3 cases and poor in 3 cases. The overall clinical efficacy rate was 76.0%. Clinical efficacy classified by diagnosis was 66.7% in wound infection, 66.7% in abscess, 88.9% in infected atheroma, and 100% in furuncle. Side effects were not observed in all cases among 25 patients in CXD trials. Studies of excretion into wound exudate of CXD were performed in 1 postoperative case of mamma carcinoma after oral administration of 500 mg of CXD. The concentration of CXD in exudate was 1.12 micrograms/ml in 2 hours, 3.48 micrograms/ml in 3 hours, 4.13 micrograms/ml in 4 hours, 5.56 micrograms/ml in 5 hours and 4.41 micrograms/ml in 6 hours after administration, which was observed that CXD was excreted in wound exudate in high concentration.