A dose of 50 to 100 mg may be given every 4 to 6 hours by intramuscular injection or intravenous injection. For the treatment of postoperative pain, the initial dose is 100 mg followed by 50 mg every 10 to 20 minutes if necessary to a total maximum (including the initial dose) of 250 mg in the first hour. Therefore, doses are 50 to 100 mg every 4 to 6 hours up to a total daily dose of 600 mg.