Objective To evaluate the efficacy and safety of cefprozil in the treatment of lower respiratory tract infections. Methods One hundred and twenty patients with mild to moderate lower respiratory tract infection were divided into two groups. Sixty two patients were treated with cefprozil 500 mg, orally,twice a day, Fifty eight patients were treated with cefaclor 500 mg,orally,threetimes a day. In both groups 7-14 d was a treatment course. Results The total clinical effective rates of cefprozil and cefa...