Conclusion: :Memantine 20 mg/day caused a clinically noticeable reduction in deterioration over 28 weeks in patients with moderate to severe Alzheimer disease. This was supported by less functional and cognitive deterioration. Patients taking memantine were less likely to become agitated. The effect in mild to moderate AD is unknown. Patients with mild to moderate vascular dementia receiving memantine 20 mg/day had less cognitive deterioration at 28 weeks but the effects were not clinically discernible. There is an early beneficial effect on cognition, mood, behaviour and clinical impression for memantine
PubMed 15495043 ↗Namenda
The short answer. There isn't much data on Namenda yet — 4 mentions, 0 with a clear outcome — so treat these numbers as anecdotal. There is a moderate body of research — 1 meta-analyses and 5 trials.
Out of 4 mentions; the other 100% didn't say how it went and aren't counted.
What Namenda does, according to users
Of the people who reported each effect, the share who said it got better.
What the research says
Systematic reviews and meta-analyses from PubMed, with their published conclusions.
At least one meta-analysis, or 5+ randomized controlled trials. The grade measures how much human research exists — read the conclusions below for what it found.
Dosage people report
Reported side effects
How often each side effect came up across all reports.
What users say
First-hand experiences, quoted verbatim. We show one positive and one negative where both exist.
Top discussions (4)
More medications
User data from public discussions; research from PubMed. Information only, not medical advice — talk to a doctor before starting, stopping or combining anything. Data updated October 3, 2026. How we rate