What is the maximum single adult dose of morphine sulfate?

• A. 2 mg
• B. 5 mg
• C. 10 mg
• D. 15 mg

Answer: (C)

The key idea is balancing effective pain relief with safety by limiting how much morphine is given at once. In adult prehospital practice, morphine is dosed in small, titratable steps, and a common safety cap for a single administration is 10 mg. Giving more than 10 mg in one dose raises the risk of serious respiratory depression, hypotension, sedation, and other adverse effects without yielding proportional benefit in most patients. So 10 mg serves as the maximum single-dose limit to protect patients, with additional dosing considered only within protocol guidelines and often after reassessment. Route and patient factors can influence exact dosing, but the single-dose ceiling remains at 10 mg in many EMS protocols.