Cholinesterase inhibitors are a class of medications that block the action of the enzyme acetylcholinesterase. This enzyme breaks down the neurotransmitter acetylcholine, which is important for communication between nerve cells. By inhibiting this enzyme, these medications increase the levels of acetylcholine in the brain, which can help improve cognitive function and memory. These drugs are commonly used to treat conditions like Alzheimer's disease and other forms of dementia. Some well-known examples of cholinesterase inhibitors include donepezil, rivastigmine, and galantamine. While they can help manage symptoms, they do not cure the underlying disease.