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Hialeah, FL
A 73-year-old male asked:

i stopped taking namenda (memantine) a few days ago because of confusion problems, how long do the effects last after stopping? i now take donepezil 5mg

1 doctor answer1 doctor weighed in
Dr. Lynne Weixel
Clinical Psychology 36 years experience
Good change, I hope: The half-life of Namenda (memantine) is no more than 80 hrs. This should mean that it will be unlikely to still have and effects in a week to 10 days. But your doctor or a pharmacist may explain it better. The new drug should not have that side effect, but watch it and discuss risks w/ the doctor too. Best wishes for good results!

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Last updated Dec 3, 2016
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