A cholinergic is a substance that inhibits, enhances, or mimics acetylcholine:  a neurotransmitter in the brain.  Acetylcholine is involved in learning and memory.                 Cholinergics include substances which either make more acetylcholine available in the brain, provide the building blocks for acetylcholine, or enhance its bioavailability in the body and brain. An anti-cholinergic inhibits acetylcholine functions. Cholinergics can be helpful for improving memory and protecting the brain as it ages and is beneficial for neurodegenerative diseases like Alzheimer’s disease.