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Effects of milnacipran on neurocognition, pain, and fatigue in fibromyalgia: a 13-week, randomized, placebo-controlled, crossover trial.

ABSTRACT: To investigate whether milnacipran is safe and effective in improving cognitive function in patients with fibromyalgia.Patients were randomly assigned to receive milnacipran or placebo for 6 weeks, followed by a 1-week washout and then crossover to the other arm for another 6 weeks. The overall trial lasted 13 weeks and was conducted between July 2011 and May 2013. Assessments were performed at each visit. Neurocognition was measured by the Brief Assessment of Cognition (BAC) and MATRICS. Pain was assessed by the visual analog scale (VAS) for pain. Global assessment of fibromyalgia symptoms was measured by the Fibromyalgia Impact Questionnaire (FIQ) and tender point examination. Depression was assessed by the Beck Depression Inventory (BDI). Fatigue was assessed by the Fatigue Severity Scale. Functional outcome was evaluated by the Health Assessment Questionnaire. The Clinical Global Impressions-Severity of Illness (CGI-S) and Improvement (CGI-I) scales and the Patients Clinical Global Impression of Change were used to measure the global impression of severity and improvement.26 subjects were screened, and 20 subjects completed the trial. The change in verbal memory (P = .001) and the composite T score (P = .044) of the BAC and the change in the attention-vigilance domain T score (P = .042) were significantly improved, but there were no differences between the drug and placebo groups. The changes in the CGI-S scores were not significant, but the changes in the Clinical Impression-Improvement (CGI-I) scores showed worsening in the placebo group at week 1 (P = .032), week 2 (P = .024), week 4 (P = .024), and week 6 (P = .60) compared to baseline. The change in FIQ scores was not significant.Milnacipran may have a potential role in the improvement of pain, disability, and mood. The effect of milnacipran on cognition in fibromyalgia needs further research.ClinicalTrials.gov identifier: NCT01829243.

SUBMITTER: Kim JL

PROVIDER: S-EPMC3977772 | biostudies-literature | 2013

REPOSITORIES: biostudies-literature

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Effects of milnacipran on neurocognition, pain, and fatigue in fibromyalgia: a 13-week, randomized, placebo-controlled, crossover trial.

Kim Jeong Lan JL Rele Shilpa S Marks David M DM Masand Prakash S PS Yerramsetty Pallavi P Millet Robert A RA Keefe Richard S RS Patkar Ashwin A AA

The primary care companion for CNS disorders 20130101 6

<h4>Objective</h4>To investigate whether milnacipran is safe and effective in improving cognitive function in patients with fibromyalgia.<h4>Method</h4>Patients were randomly assigned to receive milnacipran or placebo for 6 weeks, followed by a 1-week washout and then crossover to the other arm for another 6 weeks. The overall trial lasted 13 weeks and was conducted between July 2011 and May 2013. Assessments were performed at each visit. Neurocognition was measured by the Brief Assessment of Co ...[more]

PMID: 24800123

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Project description:BACKGROUND:Milnacipran is a serotonin-norepinephrine reuptake inhibitor (SNRI) that is sometimes used to treat chronic neuropathic pain and fibromyalgia. OBJECTIVES:To evaluate the analgesic efficacy and adverse effects of milnacipran in the management of chronic neuropathic pain or fibromyalgia. SEARCH METHODS:We searched CENTRAL, MEDLINE, and EMBASE to 4th of January 2012, together with reference lists of retrieved papers and reviews. SELECTION CRITERIA:We included randomised, double-blind studies of eight weeks duration or longer, comparing milnacipran with placebo or another active treatment in chronic neuropathic pain or fibromyalgia. DATA COLLECTION AND ANALYSIS:We extracted efficacy and adverse event data, and two study authors examined issues of study quality independently. MAIN RESULTS:Five studies (4138 participants) were included, all of which were placebo-controlled, involved participants with fibromyalgia, and used titration to a target dose of 100 mg or 200 mg milnacipran. There were no other active comparators or studies in other neuropathic pain conditions. Study quality was generally good, although the imputation method used in analyses of the primary outcomes could overestimate treatment effect.Both doses of milnacipran provided moderate levels of pain relief to about 40% of those treated, compared to 30% with placebo, giving a number needed to treat of 8 to 10. Adverse events were common in both milnacipran (87%) and placebo (78%) groups, but serious adverse events (< 2%) did not differ between groups. Nausea and constipation were the most common events showing the greatest difference between groups (number needed to treat for an additional harmful outcome of 7 and 13 respectively, compared with placebo).Withdrawals for any reason were more common with milnacipran than placebo, and more common with 200 mg than 100 mg (NNH of 23 and 8.8 respectively, compared with placebo). This was largely driven by adverse event withdrawals, where the NNH compared with placebo was 14 for 100 mg, and 7.0 for 200 mg). Withdrawals due to lack of efficacy were more common with milnacipran than placebo but did not differ between doses (number needed to treat to prevent an additional unwanted outcome of 45 and 41 respectively). AUTHORS' CONCLUSIONS:The evidence available indicates that milnacipran 100 mg or 200 mg is effective for a minority in the treatment of pain due to fibromyalgia, providing moderate levels of pain relief (at least 30%) to about 40% of participants, compared with about 30% with placebo. There were insufficient data to assess substantial levels of pain relief (at least 50%), and the use of last observation carried forward imputation may overestimate drug efficacy. Milnacipran is associated with increased adverse events and adverse event withdrawals, which were significantly greater for the higher dose. There were no data for the use of milnacipran for other chronic neuropathic pain conditions.

Project description:Milnacipran, a serotonin/norepinephrine reuptake inhibitor, has been approved by the US Food and Drug Administration for the treatment of fibromyalgia (FM). This report presents the results of a randomized, double-blind, placebo-controlled trial of milnacipran conducted to test the hypotheses that a) similar to patients with chronic fatigue syndrome, patients with FM have increased ventricular lactate levels at baseline; b) 8 weeks of treatment with milnacipran will lower ventricular lactate levels compared with baseline levels and with ventricular lactate levels after placebo; and c) treatment with milnacipran will improve attention and executive function in the Attention Network Test compared with placebo. In addition, we examined the results for potential associations between ventricular lactate and pain. Baseline ventricular lactate measured by proton magnetic resonance spectroscopic imaging was found to be higher in patients with FM than in healthy controls (F1,37 = 22.11, P < .0001, partial ?(2) = .37). Milnacipran reduced pain in patients with FM relative to placebo but had no effect on cognitive processing. At the end of the study, ventricular lactate levels in the milnacipran-treated group had decreased significantly compared with baseline and after placebo (F1,18 = 8.18, P = .01, partial ?(2) = .31). A significantly larger proportion of patients treated with milnacipran showed decreases in both ventricular lactate and pain than those treated with placebo (P = .03). These results suggest that proton magnetic resonance spectroscopic imaging measurements of lactate may serve as a potential biomarker for a therapeutic response in FM and that milnacipran may act, at least in part, by targeting the brain response to glial activation and neuroinflammation.Patients treated with milnacipran showed decreases in both pain and ventricular lactate levels compared with those treated with placebo, but, even after treatment, levels of ventricular lactate remained higher than in controls. The hypothesized mechanism for these decreases is via drug-induced reductions of a central inflammatory state.

Dataset Information

Effects of milnacipran on neurocognition, pain, and fatigue in fibromyalgia: a 13-week, randomized, placebo-controlled, crossover trial.

Publications

Effects of milnacipran on neurocognition, pain, and fatigue in fibromyalgia: a 13-week, randomized, placebo-controlled, crossover trial.

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