Capsule
50 mg
Injection
50 mg/ml
Opioid analgesic. Produces analgesia by opioid effect as well as by enhancement of serotonergic and adrenergic pathways
Adult and child over 12 years: by mouth, 50–100 mg not more often than every 4 hours (max 400 mg daily). By IM injection, slow IV injection over 2–3 minutes, or IV infusion, 50–100 mg every 4–6 hours.
Adult: initially, 100 mg then 50 mg every 10–20 minutes if necessary during the first hour to a total of 250 mg (includes initial dose). Then, 50–100 mg every 4–6 hours (max 600 mg daily).