Rivastigmine is a medication primarily used to treat symptoms of Alzheimer's disease and Parkinson's disease dementia. It works by inhibiting the enzyme acetylcholinesterase, which breaks down the neurotransmitter acetylcholine. By increasing acetylcholine levels in the brain, rivastigmine can help improve cognitive function and memory. Rivastigmine is available in various forms, including capsules, a liquid solution, and a transdermal patch. The choice of form depends on patient needs and preferences. Common side effects may include nausea, vomiting, and diarrhea, but these effects often lessen over time as the body adjusts to the medication.