https://bigpharmausa.com/how-to-get-rid-of-body-aches/ Adverse effects of donepezil include: Commonly, nausea, vomiting, anorexia, diarrhea, fatigue, insomnia, headache, dizziness, syncope, abnormal dreams, hallucinations, agitation, aggression, muscle cramps, urinary incontinence, rash, and pruritus.