Morphine peak effect timeframe?

• A. 60-120 minutes
• B. 15-30 minutes
• C. 2-3 hours
• D. 30-60 minutes

Answer: (D)

Peak analgesic effect for morphine given by the common parenteral route occurs about 30–60 minutes after administration. After injection, absorption from the muscle takes time, with onset typically around 10–30 minutes and the maximum effect reached as levels rise in the system, which lands in the 30–60 minute window. This makes 30–60 minutes the best estimate among typical options. For contrast, intravenously given morphine acts much more quickly, with peak effects in just minutes, while orally administered morphine peaks later (roughly 60–120 minutes) due to slower absorption and first-pass metabolism.