Tonsillitis, sinusitis, otitis media; acute & chronic bronchitis, pneumonia, thoracic empyema, lung abscess; boils & abscesses, cellulitis, wound infection, intra-abdominal sepsis; cystitis, urethritis, nephropyelitis, septic abortion, puerperal sepsis, pelvic infection, chancroid, gonorrhoea; osteomyelitis; septicaemia; peritonitis. Surgical prophylaxis.