PMID: 2488674Aug 1, 1989Paper

Does intravenous methadone provide longer lasting analgesia than intravenous morphine? A randomized, double-blind study

Pain
L GrochowJ Enterline

Abstract

A prospective, randomized, double-blind trial was designed to compare the duration of analgesia produced by intravenous morphine and methadone. Patients with intractable cancer-related pain were studied for 5-6 days. One-eighth of the patient's daily opiate requirement was supplied as an i.v. infusion of either morphine or methadone over a period of 15 min. when initiated by the patient using a patient-controlled analgesia device. Dosing intervals, pain intensity assessments and toxicity were evaluated. Twenty-three patients were randomized; 18 were fully evaluable. Ten of the evaluable patients received morphine, 8 received methadone. Dosing intervals did not change over the 5 days for either group. The mean dosing interval for the last 10 doses was 3.9 +/- 0.85 h for patients receiving morphine and 3.9 +/- 1.6 h for patients receiving methadone (P = NS). One patient receiving morphine and one taking methadone required only 2-3 doses/day for pain control. Pain intensity and relief were similar for both groups. All patients had adequate analgesia as determined by at least a 50% difference in pain intensity at peak relief. The duration of pain relief when repeated intravenous doses of these analgesics were given was similar thro...Continue Reading

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