Forty-seven adults with infected cutaneous lesions including decubitus ulcers, leg ulcers, cellulitis, pyoderma, and infected dermatitis were treated in a randomized single-blind study with ceftizoxime (2 gm/day, administered intravenously) or cefamandole (4 gm/day, administered intravenously). The duration of treatment ranged from five to 17 days with ceftizoxime and from six to 14 days with cefamandole. Both gram-positive cocci (mostly Staphylococcus sp) and gram-negative bacilli were cultured from the infected areas before treatment. Clinical and bacteriological responses to both drugs were excellent. Ceftizoxime at a dosage of 1 gm twice daily proved to be at least as effective as 1 gm of cefamandole given four times daily. Both drugs were well tolerated, effective, and safe in the treatment of skin and skin-structure infections. Neither drug therapy had to be discontinued because of adverse effects.