What is the peak effect time for methadone?

What is the peak effect time for methadone?

• A. 60-90 mins
• B. 5-10 mins
• C. 15-20 mins
• D. 30-45 mins

Answer: (C)

Peak effect time reflects how long it takes for the maximal analgesic effect to be reached after administration. For methadone given intravenously, you start to feel analgesia within minutes, but the maximum effect occurs a bit later as the drug distributes to tissues and engages CNS receptors. That typically happens around 15-20 minutes after administration, making the 15-20 minute window the best choice. The 5-10 minute range is the onset window, not the peak. The longer ranges (30-45 or 60-90 minutes) are later than the usual peak for IV methadone and don’t fit the typical IV peak timing.

Peak effect time reflects how long it takes for the maximal analgesic effect to be reached after administration. For methadone given intravenously, you start to feel analgesia within minutes, but the maximum effect occurs a bit later as the drug distributes to tissues and engages CNS receptors. That typically happens around 15-20 minutes after administration, making the 15-20 minute window the best choice. The 5-10 minute range is the onset window, not the peak. The longer ranges (30-45 or 60-90 minutes) are later than the usual peak for IV methadone and don’t fit the typical IV peak timing.