It helps for a little while, but people on it can’t take stress of any kind and are prone to nasty outbursts that make no sense. And hallucinations. They get agitated and can’t concentrate for even a short time.
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I searched for words to describe the effects of namenda on both my paternal grandmother and my mother... Your observation is spot-on.
I lived those reactions in my F-I-L...it is not pleasant and it is not possible for him to function in public to any capacity if that is his medication.