Exelon (rivastigmine) is used to treat individuals suffering from memory loss caused by Parkinson's Disease or Alzheimer's Disease. It is a part of the cholinesterase inhibitors drug class. Exelon helps to treat certain symptoms dementia by preventing a breakdown of chemicals. Exelon (rivastigmine) is a medication which works by preventing the breakdown of certain chemicals essential for the processes of the memory, reasoning and thinking. It helps improve the function of nerve cells in the brain. Exelon is mainly used to treat mild-moderate dementia caused by conditions such as Alzheimer’s and Parkinson’s disease. Dementia is caused by low levels of these chemicals. However, this medication may also be used for other conditions as determined by the doctor. Exelon may cause some side effects to the user. Some of the effects of Exelon include nausea, vomiting, drowsiness, headache, weight loss, dizziness, depression, anxiety or stomach pain.