Intravenous
Susceptible infections
Adult: 15,000-25,000 U/kg daily by continuous IV drip or intermittent infusion 12 hrly at 60-120 min duration. Max: 2,000,000 U/day.
Intramuscular
Susceptible infections
Adult: 25,000-30,000 U/kg daily in divided doses 4-6 hrly. Max: 2,000,000 U/day.
Intrathecal
Meningitis
Adult: 50,000 U once daily for 3-4 days, then on alternate days for at least 2 wk after CSF cultures are negative and CSF glucose content is normal. Max: 2,000,000 U/day.