Donepezil is a prescription-only drug used to alleviate some of the symptoms ofdisease. There are currently around 5 million prescriptions per year in the US alone. It's sold under the brand names of Aricept, Namzaric and others.
The drug is a centrally-acting inhibitor of enzymes which reduce the levels of naturally occurring acetylcholine, thus increasing its availability - but the 'mechanism of action' with regard to Alzheimer's is currently unknown.
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