ARICEPT® (donepezil HCl tablets)|Treatment For Alzheimer's DiseaseImportant Safety Information | Prescribing Information | Healthcare Professionals E-mail ARICEPT is well tolerated but may not be for everyone. People at risk for stomach ulcers or who take certain other medicines should tell their doctors because serious stomach problems, such as bleeding, may get worse. Some people who take ARICEPT may experience fainting. Some people may have nausea, vomiting, diarrhea, bruising, or not sleep well. Some people may have muscle cramps or loss of appetite or may feel tired. In studies these were usually mild and temporary. For full prescribing information, please visit Prescribing Information.