Donepezil is used to treat individuals suffering from dementia and Alzheimer's disease. The drug is a part of the cholinesterase inhibitors drug class. Donepezil will not cure dementia or Alzheimer's disease, but may help to improve thinking ability. Donepezil Hcl is used to treat dementia, a brain disorder that interferes with the ability to remember, communicate clearly and carry out day to day activities in people suffering from Alzheimer’s. Donepezil Hcl does not cure Alzheimer’s, but it improves memory, awareness, and cognitive ability. Donepezil Hcl is an enzyme blocker. It works by reinstating the balance of certain chemicals occurring naturally in the brain known as neurotransmitters. Donepezil Hcl is taken with or without food as directed by the physician usually once every twenty-four hours, just before bedtime. If you have sleep problems, you may consider consulting a doctor about switching to a morning dose.