Which drug would most likely be an initial treatment for a patient with Alzheimer's disease? 1. ...

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Rationale 1: Levodopa (Larodopa) is used for Parkinson's disease.
Rationale 2: Haloperidol (Haldol) can be used in some cases of Alzheimer's disease, but due to its adverse effects it is not frequently used.
Rationale 3: Benztropine mesylate (Cogentin) is used for Parkinson's disease.
Rationale 4: Donepezil hydrochloride (Aricept) is an acetylcholinesterase inhibitor and the most frequently used drug for Alzheimer's disease.
Global Rationale: Donepezil hydrochloride (Aricept) is an acetylcholinesterase inhibitor and the most frequently used drug for Alzheimer's disease. Levodopa (Larodopa) and benztropine mesylate (Cogentin) are used for Parkinson's disease. Haloperidol (Haldol) can be used in some cases of Alzheimer's disease, but due to its adverse effects it is not frequently used.