Morphine Pharmacokinetics and Elimination
Immediate Pharmacokinetic Profile
- The peak plasma concentrations of normal-release morphine occur within 1 hour after oral administration, with an analgesic effect lasting approximately 4 hours, and steady-state plasma levels are achieved within 24 hours after starting treatment, according to the British Journal of Cancer guidelines 1, 2
- The duration of analgesia for modified-release morphine extends to 12 or 24 hours depending on formulation, with peak plasma concentrations delayed to 2-6 hours after administration, as recommended by the British Journal of Cancer 1, 2