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People with Alzheimer’s disease experience a loss of nerve cells that use a chemical called acetylcholine as a chemical messenger. Dementia symptoms become more severe as more nerve cells are lost. Cholinesterase inhibitors are a group of drugs (including donepezil, rivastigmine and galantamine) that prevent the enzyme acetylcholinesterase from breaking down acetylcholine in the brain. [read the full story…]