Combination of morphine with nortriptyline for neuropathic pain

Pain
Ian GilronDeborah DuMerton-Shore

Abstract

First-line neuropathic pain drugs, including tricyclic antidepressants, are not always effective, and opioids have been recommended as second line. This trial evaluates a nortriptyline-morphine combination, compared with each monotherapy. In this randomized, double-blind crossover trial, patients with neuropathic pain were enrolled at 1 site between January 25, 2010, and May 22, 2014, and randomized in a 1:1:1 ratio using a balanced Latin square design to receive oral nortriptyline, morphine, and their combination. During each of three 6-week periods, doses were titrated toward maximal tolerated dose (MTD). The primary outcome was average daily pain at MTD, and secondary outcomes included other pain, mood and quality of life measures, and adverse effects. Sixty-two patients were screened, 52 enrolled, and 39 completed at least 2 treatment periods. Average daily pain (0-10) at baseline was 5.3 and at MTD was 2.6 for combination vs 3.1 for nortriptyline (P = 0.046) and 3.4 for morphine (P = 0.002). Brief Pain Inventory scores for average and present pain were also significantly lower for combination vs each monotherapy. Combination treatment resulted in moderate-severe constipation in 43% vs 46% with morphine (P = 0.82) and 5% wi...Continue Reading

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