Adult including elderlySepticaemia, endocarditis, osteomyelitis 500 mg IM or IV 4-6 times daily for 1-6 wk. Peritonitis, intra-abdominal sepsis 500 mg IM or IV qds.Adult Meningitis 2 g IV 6-hrly. Childn 150 mg/kg IV daily in divided doses. Local use in abdominal surgery 1 g sprinkled extraperitoneally into wound or muscle layers. Childn <10 yr Usual dose: ½ adult dose.