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Introduction Immediate-release memantine (10 mg, twice daily) is approved in the USA for moderate-to-severe Alzheimer’s disease (AD). This study evaluated the efficacy, safety, and tolerability of a higher-dose, once-daily, extended-release formulation in patients with moderate-to-severe AD concurrently taking cholinesterase inhibitors. Methods In this 24-week, double-blind, multinational study (NCT00322153), outpatients with AD (Mini-Mental State Examination scores of 3–14) were randomized to receive once-daily, 28-mg, extended-release memantine or placebo. Co-primary efficacy parameters were the baseline-to-endpoint score change on the Severe Impairment Battery (SIB) and the endpoint score on the Clinician’s Interview-Based Impression of Change Plus Caregiver Input (CIBIC-Plus). The secondary efficacy parameter was the baseline-to-endpoint score change on the 19-item Alzheimer’s Disease Cooperative Study–Activities of Daily Living (ADCS–ADL 19 ); additional parameters included the baseline-to-endpoint score changes on the Neuropsychiatric Inventory (NPI) and verbal fluency test. Data were analyzed using a two-way analysis of covariance model, except for CIBIC-Plus (Cochran–Mantel–Haenszel test). Safety and tolerability were assessed through adverse events and physical and laboratory examinations. Results A total of 677 patients were randomized to receive extended-release memantine ( n  = 342) or placebo ( n  = 335); completion rates were 79.8 and 81.2 %, respectively. At endpoint (week 24, last observation carried forward), memantine-treated patients significantly outperformed placebo-treated patients on the SIB (least squares mean difference [95 % CI] 2.6 [1.0, 4.2]; p   =  0.001), CIBIC-Plus ( p  = 0.008), NPI ( p  = 0.005), and verbal fluency test ( p  = 0.004); the effect did not achieve significance on ADCS–ADL 19 ( p  = 0.177). Adverse events with a frequency of ≥5.0 % that were more prevalent in the memantine group were headache (5.6 vs. 5.1 %) and diarrhea (5.0 vs. 3.9 %). Conclusion Extended-release memantine was efficacious, safe, and well tolerated in this population.

Background Obsessive-Compulsive Disorder (OCD) involves persistent, intrusive thoughts and repetitive behaviors. While SSRIs like escitalopram are common treatments, some patients do not respond adequately. This study aims to assess memantine’s effectiveness as an adjunct therapy to enhance executive function in OCD patients. Methods This study was a 16-week, randomized, double-blind, placebo-controlled clinical trial to evaluate if adding memantine to escitalopram helps treat OCD. A total of 60 participants were recruited from Namazi Hospital and Ibn Sina Polyclinic in Shiraz, Iran. Participants were randomly divided into two groups: the control group received escitalopram plus placebo, and the intervention group received escitalopram plus memantine. The main outcome, the severity of OCD symptoms, was measured using the Yale-Brown Obsessive-Compulsive Scale (Y-BOCS), and executive function was assessed using the Barkley Deficits in Executive Functioning Scale (BDEFS). Safety was checked weekly using the Drug Adverse Event Questionnaire. Data were analyzed using SPSS, with a significance level set at p  < 0.05. Results All sixty participants completed the 16 weeks of the study. Thirty participants per group (Placebo, Memantine) showed no significant differences in age, gender, or education ( P  > 0.05) at baseline. Both groups showed significant reductions in Y-BOCS scores ( P  < 0.001), with the Placebo group decreasing from 32.83 (SD = 4.04) to 5.30 (SD = 3.18) and the Memantine group from 31.60 (SD = 2.62) to 5.20 (SD = 2.62) without difference between groups ( P  = 0.12). Notebale Improvements in executive function were observed, particularly in time management, where Memantine outperformed Placebo ( P  = 0.03). Other domains showed no significant differences. Adverse events were minimal; gastrointestinal symptoms were rare, with Memantine showing a higher incidence but not statistically significant. Conclusion The study found that while both treatment regimens significantly alleviated OCD symptoms, memantine did not provide notable advantages over escitalopram alone, except in time management. Further research is needed to assess long-term effects and mechanisms of this combination therapy. Trial registration IRCT20211118053093N5, 25/06/2025.

Down syndrome is a chromosomal disorder with considerable neurodevelopmental impact and neurodegenerative morbidity. In a pilot trial in young adults with Down syndrome, memantine (a drug approved for Alzheimer's disease) showed a significant effect on a secondary measure of episodic memory. We aimed to test whether memantine would improve episodic memory in adolescents and young adults with Down syndrome. We did a randomised, double-blind, placebo-controlled phase 2 trial with a parallel design, stratified by age and sex. Participants (aged 15–32 years) with either trisomy 21 or complete unbalanced translocation of chromosome 21 and in general good health were recruited from the community at one site in Brazil and another in the USA. Participants were randomly assigned (1:1) to receive either memantine (20 mg/day orally) or placebo for 16 weeks. Computer-generated randomisation tables for both sites (allocating a placebo or drug label to each member of a unique pair of participants) were centrally produced by an independent statistician and were shared only with investigational pharmacists at participating sites until unblinding of the study. Participants and investigators were masked to treatment assignments. Neuropsychological assessments were done at baseline (T1) and week 16 (T2). The primary outcome measure was change from baseline to week 16 in the California Verbal Learning Test–second edition short-form (CVLT-II-sf) total free recall score, assessed in the per-protocol population (ie, participants who completed 16 weeks of treatment and had neuropsychological assessments at T1 and T2). Linear mixed effect models were fit to data from the per-protocol population. Safety and tolerability were monitored and analysed in all participants who started treatment. Steady-state concentrations in plasma of memantine were measured at the end of the trial. This study is registered at ClinicalTrials.gov, number NCT02304302. From May 13, 2015, to July 22, 2020, 185 participants with Down syndrome were assessed for eligibility and 160 (86%) were randomly assigned either memantine (n=81) or placebo (n=79). All participants received their allocated treatment. Linear mixed effect models were fit to data from 149 (81%) participants, 73 in the memantine group and 76 in the placebo group, after 11 people (eight in the memantine group and three in the placebo group) discontinued due to COVID-19 restrictions, illness of their caregiver, adverse events, or low compliance. The primary outcome measure did not differ between groups (CVLT-II-sf total free recall score, change from baseline 0·34 points [95% CI –0·98 to 1·67], p=0·61). Memantine was well tolerated, with infrequent mild-to-moderate adverse events, the most common being viral upper respiratory infection (nine [11%] participants in the memantine group and 12 [15%] in the placebo group) and transient dizziness (eight [10%] in the memantine group and six [8%] in the placebo group). No serious adverse events were observed. Amounts of memantine in plasma were substantially lower than those considered therapeutic for Alzheimer's disease. Memantine was well tolerated, but cognition-enhancing effects were not recorded with a 20 mg/day dose in adolescents and young adults with Down syndrome. Exploratory analyses point to a need for future work. Alana Foundation. For the Portuguese translation of the abstract see Supplementary Materials section.

In patients with moderate or severe Alzheimer's disease receiving donepezil, those assigned to continue donepezil had less cognitive decline than did those assigned to discontinue donepezil. The combination of donepezil and memantine did not confer benefits over donepezil alone. Most studies evaluating cholinesterase inhibitors for the treatment of Alzheimer's disease have focused on patients with mild-to-moderate disease. Despite questions about the methods used in the trials 1 and about the clinical significance of reported benefits, 1 , 2 guidelines advocate treatment with a cholinesterase inhibitor, although some recommend discontinuation when Alzheimer's disease becomes severe. 3 Evidence of the efficacy of memantine has been shown primarily in patients with moderate or severe Alzheimer's disease. 4 The findings of a study showing that combination therapy with memantine and a cholinesterase inhibitor was more effective than treatment with a cholinesterase inhibitor alone 5 have not been replicated. 6 Results . . .

Objective: Abnormal glutamatergic neurotransmission is implicated in the pathophysiology of autism spectrum disorder (ASD). In this study, the safety, tolerability, and efficacy of the glutamatergic N-methyl-d-aspartate (NMDA) receptor antagonist memantine (once-daily extended-release [ER]) were investigated in children with autism in a randomized, placebo-controlled, 12 week trial and a 48 week open-label extension. Methods: A total of 121 children 6–12 years of age with Diagnostic and Statistical Manual of Mental Disorders, 4th ed., Text Revision (DSM-IV-TR)-defined autistic disorder were randomized (1:1) to placebo or memantine ER for 12 weeks; 104 children entered the subsequent extension trial. Maximum memantine doses were determined by body weight and ranged from 3 to 15 mg/day. Results: There was one serious adverse event (SAE) (affective disorder, with memantine) in the 12 week study and one SAE (lobar pneumonia) in the 48 week extension; both were deemed unrelated to treatment. Other AEs were considered mild or moderate and most were deemed not related to treatment. No clinically significant changes occurred in clinical laboratory values, vital signs, or electrocardiogram (ECG). There was no significant between-group difference on the primary efficacy outcome of caregiver/parent ratings on the Social Responsiveness Scale (SRS), although an improvement over baseline at Week 12 was observed in both groups. A trend for improvement at the end of the 48 week extension was observed. No improvements in the active group were observed on any of the secondary end-points, with one communication measure showing significant worsening with memantine compared with placebo (p = 0.02) after 12 weeks. Conclusions: This trial did not demonstrate clinical efficacy of memantine ER in autism; however, the tolerability and safety data were reassuring. Our results could inform future trial design in this population and may facilitate the investigation of memantine ER for other clinical applications.

Previous studies have suggested that patients with Lewy-body-related dementias might benefit from treatment with the N-methyl D-aspartate receptor antagonist memantine, but further data are needed. Therefore, the efficacy and safety of memantine were investigated in patients with mild to moderate Parkinson's disease dementia (PDD) or dementia with Lewy bodies (DLB). Patients (≥50 years of age) with mild to moderate PDD or DLB were recruited from 30 specialist centres in Austria, France, Germany, the UK, Greece, Italy, Spain, and Turkey. They were randomly assigned to placebo or memantine (20 mg per day) according to a computer-generated list. Patients and all physicians who had contact with them were masked to treatment assignment. No primary endpoint was defined. Safety analyses were done for all patients who took at least one dose of memantine or placebo, and efficacy analyses were done for all patients who had at least one valid postbaseline assessment. This trial is registered with ClinicalTrials.gov, number NCT00855686. Of the 199 patients randomly assigned to treatment, 34 with DLB and 62 with PDD were given memantine, and 41 with DLB and 58 with PDD were given placebo. 159 (80%) patients completed the study: 80 in the memantine group and 79 in the placebo group. 93 patients treated with memantine and 97 patients treated with placebo were included in the efficacy analysis. At week 24, patients with DLB who received memantine showed greater improvement according to Alzheimer's disease cooperative study (ADCS)-clinical global impression of change scores than did those who received placebo (mean change from baseline 3·3 vs 3·9, respectively, difference −0·6 [95% CI −1·2 to −0·1]; p=0·023). No significant differences were noted between the two treatments in patients with PDD (3·6 with memantine vs 3·8 with placebo, −0·1 [−0·6 to 0·3]; p=0·576) or in the total population (3·5 with memantine vs 3·8 with placebo, −0·3 [−0·7 to 0·1]; p=0·120). Neuropsychiatric-inventory scores showed significantly greater improvement in the memantine group than in the placebo group (−4·3 vs 1·7, respectively, −5·9 [−11·6 to −0·2]; p=0·041) in patients with DLB, but not in those with PDD (−1·6 vs −0·1, respectively, −1·4 [−5·9 to 3·0]; p=0·522) or in the total patient population (−2·6 vs 0·4, respectively, −2·9 [−6·3 to 0·5]; p=0·092). In most of the cognitive test scores, ADCS-activities of daily living, and Zarit caregiver burden scores, there were no significant differences between the two treatment groups in any of the study populations. The incidence of adverse events and number of discontinuations due to adverse events were similar in the two groups. The most common serious adverse events were stroke (n=3 in memantine group), falls (n=2 in memantine group; n=1 in placebo group), and worsening of dementia (n=2 in memantine group). Memantine seems to improve global clinical status and behavioural symptoms of patients with mild to moderate DLB, and might be an option for treatment of these patients. Lundbeck.

Findings from observational studies have suggested a delay in nursing home placement with dementia drug treatment, but findings from a previous randomised trial of patients with mild-to-moderate Alzheimer's disease showed no effect. We investigated the effects of continuation or discontinuation of donepezil and starting of memantine on subsequent nursing home placement in patients with moderate-to-severe Alzheimer's disease. In the randomised, double-blind, placebo-controlled Donepezil and Memantine in Moderate to Severe Alzheimer's Disease (DOMINO-AD) trial, community-living patients with moderate-to-severe Alzheimer's disease (who had been prescribed donepezil continuously for at least 3 months at a dose of 10 mg for at least the previous 6 weeks and had a score of between 5 and 13 on the Standardised Mini-Mental State Examination) were recruited from 15 secondary care memory centres in England and Scotland and randomly allocated to continue donepezil 10 mg per day without memantine, discontinue donepezil without memantine, discontinue donepezil and start memantine 20 mg per day, or continue donepezil 10 mg per day and start memantine 20 mg per day, for 52 weeks. After 52 weeks, choice of treatment was left to participants and their physicians. Place of residence was recorded during the first 52 weeks of the trial and then every 26 weeks for a further 3 years. A secondary outcome of the trial, reported in this study, was nursing home placement: an irreversible move from independent accommodation to a residential caring facility. Analyses restricted to risk of placement in the first year of follow-up after the patients had completed the double-blind phase of the trial were post-hoc. The DOMINO-AD trial is registered with the ISRCTN Registry, number ISRCTN49545035. Between Feb 11, 2008, and March 5, 2010, 73 (25%) patients were randomly assigned to continue donepezil without memantine, 73 (25%) to discontinue donepezil without memantine, 76 (26%) to discontinue donepezil and start memantine, and 73 (25%) to continue donepezil and start memantine. 162 (55%) patients underwent nursing home placement within 4 years of randomisation, with similar numbers for all groups (36 [49%] in patients who continued donepezil without memantine, 42 [58%] who discontinued donepezil without memantine, 41 [54%] who discontinued donepezil and started memantine, and 43 [59%] who continued donepezil and started memantine). We noted significant (p=0·010) heterogeneity of treatment effect over time, with significantly more nursing home placements in the combined donepezil discontinuation groups during the first year (hazard ratio 2·09 [95% CI 1·29–3·39]) than in the combined donepezil continuation groups, and no difference during the next 3 years (0·89 [0·58–1·35]). We noted no effect of patients starting memantine compared with not starting memantine during the first year (0·92 [0·58–1·45]) or the next 3 years (1·23 [0·81–1·87]). Withdrawal of donepezil in patients with moderate-to-severe Alzheimer's disease increased the risk of nursing home placement during 12 months of treatment, but made no difference during the following 3 years of follow-up. Decisions to stop or continue donepezil treatment should be informed by potential risks of withdrawal, even if the perceived benefits of continued treatment are not clear. Medical Research Council and UK Alzheimer's Society.

Purpose Tinnitus is a common condition where a person perceives sound despite there being no external auditory stimuli. It is proven that overexpression of NMDA (N‐methyl‐d‐aspartate) glutamate receptors increases the sensitivity of neurons to glutamate transmission, creating a destructive cycle of excitotoxicity. NMDA receptor antagonists, such as memantine, seem to be effective in treating tinnitus. This study aimed to examine the effectiveness of memantine as a treatment for tinnitus in a double‐blind randomized placebo control clinical trial. Methods The participants were patients with tinnitus. A total of 70 patients were randomly assigned into two groups, intervention and a placebo, with an equal number of patients in each group. Both groups received conventional treatment with cinnarizine at a dose of 25 mg twice a day. In the intervention group, memantine was added to cinnarizine with starting dose of 5 mg. Tinnitus Severity Index (TSI) and Numeric Rating Scale (NRS) were recorded before and after study in both groups. Findings There was no significant difference in the initial mean of NRS and TSI scores between two groups. After treatment, the mean NRS and TSI scores were significantly lower in the intervention group. Although the changes in mean NRS scores were significant in both groups at the end of study but only the mean TSI scores were significantly decreased in the intervention group. Conclusion On the basis of these findings, it is suggested that memantine may have remarkable effect in reducing tinnitus and its discomfort. The graphical illustrates the study structure: 70 tinnitus patients were randomly assigned to two groups for a 60‐day treatment. The image shows excitotoxic mechanisms, intervention, and outcomes in a concept‐based layout.

Memantine (3,5-dimethyladamantan-1-amine) is an orally active, noncompetitive N-methyl-D-aspartate receptor (NMDAR) antagonist approved for treatment of moderate-to-severe Alzheimer’s disease (AD), a neurodegenerative condition characterized by a progressive cognitive decline. Unfortunately, memantine as well as the other class of drugs licensed for AD treatment acting as acetylcholinesterase inhibitors (AChEIs), provide only symptomatic relief. Thus, the urgent need in AD drug development is for disease-modifying therapies that may require approaching targets from more than one path at once or multiple targets simultaneously. Indeed, increasing evidence suggests that the modulation of a single neurotransmitter system represents a reductive approach to face the complexity of AD. Memantine is viewed as a privileged NMDAR-directed structure, and therefore, represents the driving motif in the design of a variety of multi-target directed ligands (MTDLs). In this review, we present selected examples of small molecules recently designed as MTDLs to contrast AD, by combining in a single entity the amantadine core of memantine with the pharmacophoric features of known neuroprotectants, such as antioxidant agents, AChEIs and Aβ-aggregation inhibitors.

Abstract Background Computerized auditory training (AT) modestly improves symptoms, cognition, and functioning in schizophrenia. We assessed whether d-amphetamine (AMPH) or memantine (MEM) can enhance gains from 30-h of AT. Methods Antipsychotic-medicated individuals with chronic psychosis (n = 68; mean age 47.03y; M:F = 39:29) completed up to 30 AT sessions (2-3/week; n = 50 completed 30 sessions) in 3 groups: “AMPH group” (AMPH (5 mg po) 1-h before each AT session); “MEM group” (titrated to 10 mg MEM bid and maintained that dose throughout training); “PBO group” (PBO dosed identically to either AMPH or MEM). Primary (PANSS total, MCCB Composite, WHODAS) and secondary (PANSS positive, PANSS negative, YMRS, PHQ-9, PSYRATS) outcome measures were acquired at baseline, after 10, 20, and 30 AT sessions, and 12 weeks post-training. Pill identity (active/PBO) was blind to subjects and staff. Results Marginally significant between-group gains for AMPH vs PBO were detected for one of three primary outcomes (WHODAS, P =.050; but not PANSS total or MCCB Composite), and for 3 of 5 secondary clinical outcomes (PANSS positive, YMRS, PSYRATS, P’s≤.027–.049). Within-subject gains over time were detected for primary and secondary clinical measures for AMPH (P’s≤.014–.004) and MEM (P’s≤.02–.001) groups; some of these would not survive conservative correction for multiple comparisons. No measures detected symptom worsening; treatment satisfaction exceeded subjects’ expectations. Conclusions Results are mixed; drug-associated gains in several measures vs PBO suggest that these regimens may augment AT-induced functional and clinical improvement in psychosis patients, independent of changes in neurocognition. Assessment in larger samples seems warranted.