Standard dose:
Adult & childn >12 yr 1-2 g once daily, may be raised to 4 g once daily in severe cases.
Neonate, infant & childn 15 days-12 yr 20-80 mg/kg once daily.
Neonate ≤14 days 20-50 mg/kg once daily. Max dose: 50 mg/kg. IV doses of ≥50 mg/kg should be given by infusion over at least 30 min.
Meningitis Infant & childn Initially 100 mg/kg (max of 4 g) once daily.
Lyme borreliosis Adult & childn 50 mg/kg (max of 2 g) once daily for 14 days.
Gonorrhea 250 mg single IM dose.
Peri-op prophylaxis 1-2 g single dose, 30-90 min prior to surgery.