What does anticholinergic mean?
Anticholinergic describes substances that block the action of acetylcholine, one of the body's key neurotransmitters, at the receptors where it normally acts. Because acetylcholine helps regulate muscle movement, heart rate, digestion, and glandular secretions, anticholinergic drugs can relax involuntary muscles, reduce spasms, dry up secretions, and dilate the pupils. This makes them valuable for treating conditions such as overactive bladder, irritable bowel syndrome, motion sickness, and Parkinson's disease. The term also functions as a noun: an anticholinergic is any drug with this blocking action, including familiar medicines like atropine, scopolamine, and some antihistamines. However, these effects come with well-known downsides — dry mouth, constipation, blurred vision, drowsiness, confusion, and memory difficulties — which is why clinicians weigh the 'anticholinergic burden' carefully, particularly in older adults. Strictly medical in register, the word appears in prescriptions, patient leaflets, and pharmacology literature rather than casual speech, but it is worth knowing because so many everyday medications carry anticholinergic effects.
Blocking the action of acetylcholine, a neurotransmitter, at receptor sites in the nervous system.
"Atropine is a classic anticholinergic agent used before surgery to reduce salivation."
Almost always found in medical or pharmacological writing.
A drug or other agent that blocks the action of acetylcholine.
"Her new inhaler contains an anticholinergic that helps keep her airways open."
As a noun, usually pluralized when referring to the class of such drugs collectively.
"Long-term use of anticholinergics has been linked to increased dementia risk in some studies."
Some common sleep aids and antihistamines are anticholinergics — and taking several at once can quietly stack up what doctors call 'anticholinergic burden.'
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of anticholinergic
Anticholinergic derives from the Greek-derived root 'choline', the name of the compound from which the neurotransmitter acetylcholine takes its name, combined with the prefix 'anti-' ('against') and the suffix '-ergic' ('acting upon', from Greek 'ergon', work). The term was coined in twentieth-century pharmacology as scientists mapped how drugs interact with the autonomic nervous system. It shares its roots with related terms such as cholinergic, adrenergic, and cholinomimetic, all built on the same Greek elements.
How anticholinergic is actually used
Used almost exclusively in medical and pharmacological contexts; rarely encountered in everyday conversation. The noun form typically appears in plural when referring to classes of drugs. In clinical settings, 'anticholinergic burden' refers to the cumulative effect of multiple anticholinergic medications.
Easily confused with anticholinergic
Cholinergic agents mimic or enhance acetylcholine's effects, whereas anticholinergic agents block them — they are pharmacological opposites.