Acetylcholinesterase inhibitor

Acetylcholinesterase inhibitors are a class of pharmaceutical that inhibits the enzymes that break down acetylcholine. This increases the available amount of acetylcholine and its duration of action. They are commonly used to treat myasthenia gravis, glaucoma, Alzheimer's disease, Parkinson's disease and schizophrenia. In many cases, the dose given to the patient is slowly increased until the therapeutic effect appears. 
Common side effects are bradycardia and associated low blood pressure
Acetylcholinesterase inhibitor at Wikipedia