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Influence of combined treatment with naltrexone and memantine on alcohol drinking behaviors: a phase II randomized crossover trial.
Krishnan-Sarin, S, O'Malley, SS, Franco, N, Cavallo, DA, Tetrault, JM, Shi, J, Gueorguieva, R, Pittman, B, Krystal, JH
Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology. 2020;(2):319-326
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Abstract
Glutamate and opioid systems play important roles in alcohol drinking behaviors. We examined if combined treatment with the NMDA antagonist memantine and the opioid antagonist naltrexone, when compared with naltrexone alone, would have a greater influence on alcohol drinking behaviors. Fifty-six, non-treatment-seeking heavy drinkers, with alcohol dependence and a positive family history (FHP) of alcoholism, participated in a randomized, double-blind, crossover trial, including two 6-8 days treatment periods, separated by a 6-day washout, and 3 alcohol drinking paradigm (ADP) sessions. After the first baseline (BAS) ADP1 session, participants were randomized to receive either naltrexone (NTX; 50 mg/day) + placebo memantine, or NTX (50 mg/day) + memantine (MEM; 20 mg/day), during the first treatment period, following which they completed ADP2. After a 6-day washout, participants were crossed over to the treatment they did not receive during the first treatment period, following which they completed ADP3. During each ADP, participants received a priming drink of alcohol followed by 3 1-hour, self-administration periods during which they had ad-lib access to 12 drinks. Individually, both NTX and NTX + MEM, when compared to BAS ADP1, significantly reduced the number of drinks consumed (p's < 0.001) and craving (p's < 0.001). When comparing NTX + MEM vs. NTX on number of drinks consumed, there was a significant treatment* sequence interaction (p = 0.004). Specifically, when NTX + MEM followed NTX alone, NTX + MEM resulted in a further reduction in drinking (mean: -1.94; 95% CI: -2.6, -0.8, p = 0.0005). However, when NTX alone followed NTX + MEM, NTX alone did not lead to further reduction in drinking (mean: 0.59; 95% CI: -0.67, 1.43, p = 0.47). Similar patterns were observed for alcohol craving; specifically, a significant reduction in craving was observed when NTX + MEM followed NTX alone (p = 0.009), but craving reduction was maintained when NTX + MEM was followed by NTX alone. Neither treatment condition significantly influenced alcohol-induced stimulation or sedation. Memantine (at a dose of 20 mg/day) enhances the efficacy of naltrexone (50 mg/day) in reducing alcohol drinking and craving among FHP drinkers with beneficial effects that appear to carryover after discontinuation of memantine treatment.
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Efficacy and safety of memantine in children with autism spectrum disorder: Results from three phase 2 multicenter studies.
Hardan, AY, Hendren, RL, Aman, MG, Robb, A, Melmed, RD, Andersen, KA, Luchini, R, Rahman, R, Ali, S, Jia, XD, et al
Autism : the international journal of research and practice. 2019;(8):2096-2111
Abstract
Three phase 2 trials were conducted to assess the efficacy and long-term safety of weight-based memantine extended release (ER) treatment in children with autism spectrum disorder. MEM-MD-91, a 50-week open-label trial, identified memantine extended-release treatment responders for enrollment into MEM-MD-68, a 12-week randomized, double-blind, placebo-controlled withdrawal trial. MEM-MD-69 was an open-label extension trial in which participants from MEM-MD-68, MEM-MD-91, and open-label trial MEM-MD-67 were treated ⩽48 weeks with memantine extended release. In MEM-MD-91, 517 (59.6%) participants were confirmed Social Responsiveness Scale responders at week 12; mean Social Responsiveness Scale total raw scores improved two to three times a minimal clinically important difference of 10 points. In MEM-MD-68, there was no difference between memantine and placebo on the primary efficacy parameter, the proportion of patients with a loss of therapeutic response (defined as ⩾10-point increase from baseline in Social Responsiveness Scale total raw score). MEM-MD-69 exploratory analyses revealed mean standard deviation improvement in Social Responsiveness Scale total raw score of 32.4 (26.4) from baseline of the first lead-in study. No new safety concerns were evident. While the a priori-defined efficacy results of the double-blind trial were not achieved, the considerable improvements in mean Social Responsiveness Scale scores from baseline in the open-label trials were presumed to be clinically important.
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Effect of the Glutamate NMDA Receptor Antagonist Memantine as Adjunctive Treatment in Borderline Personality Disorder: An Exploratory, Randomised, Double-Blind, Placebo-Controlled Trial.
Kulkarni, J, Thomas, N, Hudaib, AR, Gavrilidis, E, Grigg, J, Tan, R, Cheng, J, Arnold, A, Gurvich, C
CNS drugs. 2018;(2):179-187
Abstract
BACKGROUND Borderline personality disorder (BPD) is a complex, severe and highly stigmatised psychiatric illness. Several lines of evidence highlight the causal link between chronic stress, glucocorticoid response to stress and glutamatergic overactivity as a key event in the pathophysiology of BPD. Therefore, molecular mechanisms capable of regulating glutamate excitotoxicity represent novel and potentially promising treatment targets. Memantine-HCl is a voltage-dependent N-methyl-D-aspartate (NMDA) receptor 'channel blocker' that selectively blocks pathological glutamate overactivity. OBJECTIVE The aim of the current study was to determine if memantine can improve BPD symptoms. METHOD An 8-week, double-blind, placebo-controlled trial of adjunctive memantine to treatment as usual was conducted. Treatment as usual comprised antidepressants (selective serotonin reuptake inhibitors, tricyclic antidepressants, monoamine oxidase inhibitors, noradrenergic and specific serotonin antagonists and serotonin noradrenaline reuptake inhibitors), mood stabilisers and antipsychotics, as well as psychotherapy and other psychosocial interventions. Sixteen participants received oral placebo while 17 participants received daily oral memantine 10 mg for 7 days, with subsequent titration to daily oral memantine 20 mg. Eligibility criteria included men and women aged between 16-65 years, with a diagnosis of BPD according to the Diagnostic Interview for Borderline Patients. Primary outcome measures included the Zanarini Rating Scale for Borderline Personality Disorder (ZAN-BPD), assessed fortnightly. Secondary measures included an adverse effect questionnaire administered fortnightly to assess adverse effects known to be related to memantine use. RESULTS According to intention-to-treat, latent growth curve analyses, a significant change in total score of ZAN-BPD symptom severity was observed in the memantine group at 20 mg/daily across time, compared with placebo (p = 0.02). No adverse effects were significantly more frequent among participants receiving active memantine than among those receiving placebo. CONCLUSION Memantine at a 20-mg daily dose is a well tolerated drug that can improve BPD symptomatology and may be a promising novel therapeutic for its treatment. Further studies are needed to explore the efficacy of memantine versus placebo, as well as in comparison with other potential treatments for BPD. ClinicalTrials.gov identifier: NCT02097706.
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A Prospective Open-Label Trial of Memantine Hydrochloride for the Treatment of Social Deficits in Intellectually Capable Adults With Autism Spectrum Disorder.
Joshi, G, Wozniak, J, Faraone, SV, Fried, R, Chan, J, Furtak, S, Grimsley, E, Conroy, K, Kilcullen, JR, Woodworth, KY, et al
Journal of clinical psychopharmacology. 2016;(3):262-71
Abstract
This prospective 12-week open-label trial evaluates the tolerability and efficacy of memantine hydrochloride for the treatment of core social and cognitive deficits in adults with high-functioning autism spectrum disorder (ASD). Measures for assessment of therapeutic response included the Social Responsiveness Scale-Adult Research Version (SRS-A), disorder-specific Clinical Global Impression scales, Behavior Rating Inventory of Executive Functioning-Adult Self-Report, Diagnostic Analysis of Nonverbal Accuracy Scale, and Cambridge Neuropsychological Test Automated Battery. Eighteen adults (mean age, 28 ± 9.5 years) with high-functioning ASD (SRS-A raw score, 99 ± 17) were treated with memantine (mean dose, 19.7 ± 1.2 mg/d; range, 15-20 mg), and 17 (94%) completed the trial. Treatment with memantine was associated with significant reduction on informant-rated (SRS-A, -28 ± 25; P < 0.001) and clinician-rated (Clinical Global Impression-Improvement subscale ≤2, 83%) measures of autism severity. In addition, memantine treatment was associated with significant improvement in ADHD and anxiety symptom severity. Significant improvement was noted in nonverbal communication on the Diagnostic Analysis of Nonverbal Accuracy Scale test and in executive function per self-report (Behavior Rating Inventory of Executive Functioning-Adult Self-Report Global Executive Composite, -6 ± 8.8; P < 0.015) and neuropsychological assessments (Cambridge Neuropsychological Test Automated Battery). Memantine treatment was generally well tolerated and was not associated with any serious adverse events. Treatment with memantine appears to be beneficial for the treatment of ASD and associated psychopathology and cognitive dysfunction in intellectually capable adults. Future placebo-controlled trials are warranted.