Namzaric is used to treat moderate to severe confusion (dementia) related to Alzheimer's disease. It does not cure Alzheimer's disease, but it may improve memory, awareness, and the ability to perform daily functions. This product contains 2 medications. Memantine works by blocking the action of a certain natural substance in the brain (glutamate) that is believed to be linked to symptoms of Alzheimer's disease. Donepezil is an enzyme blocker that works by restoring the balance of natural substances (neurotransmitters) in the brain.