Donepezil Hydrochloride is effective and useful in enhancing memory, improving speech and behavior, and is mostly used in the treatment of Alzheimer’s disease. Donepezil hydrochloride is recommended to be contraindicated in people who are allergic to the drug and piperidine derivatives, and some patients may experience adverse reactions such as nausea and vomiting after using the drug. Donepezil hydrochloride has the efficacy and effect of enhancing memory, improving language and behavior, and can be used to treat mild dementia, moderate dementia-induced symptoms. It is recommended that Donepezil Hydrochloride is contraindicated for people who are allergic to Donepezil Hydrochloride, or allergic to piperidine derivatives. In addition, pregnant women should avoid using Donepezil hydrochloride, and breastfeeding women should stop breastfeeding while using Donepezil hydrochloride. In addition, some patients using Donepezil Hydrochloride may experience adverse reactions such as nausea and vomiting, diarrhea, insomnia, dizziness and fatigue. Patients are advised to use Donepezil Hydrochloride under medical supervision.