anticholinergic


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Related to anticholinergic: acetylcholine, anticholinergic toxidrome

anticholinergic

 [an″te-, an″ti-ko″lin-er´jik]
1. blocking the passage of impulses through the parasympathetic nerves.
2. an agent that has this effect; called also parasympatholytic.

an·ti·cho·lin·er·gic

(an'tē-kol-i-ner'jik),
Antagonistic to the action of parasympathetic or other cholinergic nerve fibers (for example, atropine).

anticholinergic

/an·ti·cho·lin·er·gic/ (-ko″lin-er´jik) parasympatholytic; blocking the passage of impulses through the parasympathetic nerves; also, an agent that so acts.

anticholinergic

(ăn′tē-kō′lə-nûr′jĭk, ăn′tī-)
adj.
Inhibiting or blocking the physiological action of acetylcholine at a receptor site: anticholinergic drugs.

an′ti·cho′li·ner′gic n.

anticholinergic

[-kō′lənur′jik]
Etymology: Gk, anti + chole, bile, ergein, to work
1 pertaining to a blockade of acetylcholine receptors that results in the inhibition of the transmission of parasympathetic nerve impulses.
2 an anti-cholinergic agent that functions by competing with the neurotransmitter acetylcholine for its receptor sites at synaptic junctions. Anticholinergics are used to treat spastic disorders of the GI tract, to reduce salivary and bronchial secretions before surgery, or to dilate the pupil. Some anticholinergics reduce parkinsonian symptoms but are never considered primary agents for therapy. Atropine in large doses stimulates the central nervous system and in small doses acts as a depressant. Among numerous cholinergic blocking agents are atropine, belladonna, glycopyrrolate, hyoscyamine, methixene hydrochloride, trihexyphenidyl hydrochloride, and scopolamine. Also called cholinergic-blocking agent, parasympatholytic. See also antiadrenergic.

anticholinergic

adjective Referring to an agent or effect that suppresses or inhibits acetylcholine activity.
 
noun Any agent that inhibits parasympathetic activity by blocking the neurotransmitter acetylcholine; anticholinergics are used for asthma, COPD, diarrhoea, nausea, vomiting, Parkinson’s disease and to decrease smooth muscle spasms (e.g., in the urinary bladder); anticholinergics may be antimuscarinic, ganglionic blockers and neuromuscular blockers.

anticholinergic

Parasympatholytic adjective Referring to an agent or effect that suppresses or inhibits acetylcholine activity noun Any agent that inhibits parasympathetic activity by blocking the neurotransmitter, acetylcholine; anticholinergics are used for asthma, COPD, diarrhea, N&V, Parkinson's disease, and to ↓ smooth muscle spasms–eg, in the urinary bladder; anticholinergics may be antimuscarinic, ganglionic blockers, and neuromuscular blockers

an·ti·cho·lin·er·gic

(an'tē-kō'li-nĕr'jik)
1. Antagonistic to the action of parasympathetic or other cholinergic nerve fibers (e.g., atropine).
2. Any of a class of compounds exerting anticholinergic effects. Some of these compounds (e.g., atropine) are used medicinally.

anticholinergic

Antagonistic to the action of acetyl choline or to the parasympathetic or other CHOLINERGIC nerve supply. Acetyl choline stimulates muscle contraction in the intestines and elsewhere and slows the heart. Anticholinergic substances, such as ATROPINE, relieve muscle spasm, dilate the pupils and speed up the heart.

Anticholinergic

Blocking the action of the neurohormone acetylcholine. The most obvious effects include dry mouth and dry eyes.

acetylcholine (ACh) 

A neurotransmitter substance with special excitatory properties of all preganglionic autonomic neurons, all parasympathetic postganglionic neurons and a few postganglionic sympathetic neurons. Acetylcholine is synthesized and liberated by the action of the enzyme choline acetyltranferase from the compounds choline and acetyl coenzyme A (acetyl CoA) which occurs in all cholinergic neurons. ACh exists only momentarily after its formation, being hydrolysed by the enzyme acetylcholinesterase which is present in the neurons of cholinergic nerves throughout their entire lengths and at neuromuscular junctions: this process is essential for proper muscle function as otherwise the accumulation of ACh would result in continuous stimulation of the muscles, glands and central nervous system. Alternatively a shortage of ACh has devastating effect (e.g. myasthenia gravis). ACh binds to acetylcholine receptors on skeletal muscle fibres. Sodium enters the muscle fibre membrane, which leads to a depolarization of the membrane and muscle contraction. There are two main types of acetylcholine receptors (cholinergic receptors): muscarinic receptors, which are stimulated by muscarine and ACh, belong to a family of G proteins coupled receptors and are situated in parasympathetically innervated structures (e.g. the iris and ciliary body); and nicotine receptors, which are stimulated by nicotine and ACh, are ligand-gated receptors and are situated in striated muscles (e.g. the extraocular muscles). Cholinergic receptors are found in the sympathetic and parasympathetic nervous systems, in the brain and spinal cord. The action of ACh can be either blocked or stimulated by drugs: Anticholinesterase drugs (e.g. neostigmine) inhibit acetylcholinesterase and prolong the action of acetylcholine whereas antimuscarinic drugs (also referred to as anticholinergics or parasympatholytics) such as atropine, cyclopentolate, homatropine, hyoscine and tropicamide inhibit the action of acetylcholine at muscarinic receptors. Other drugs mimic the action of ACh, they are known as parasympathomimetics (e.g. pilocarpine). See cholinergic; cycloplegia; miotics; mydriatic; neurotransmitter; nicotine; synapse; autonomic nervous system.

an·ti·cho·lin·er·gic

(an'tē-kō'li-nĕr'jik)
Antagonistic to the action of parasympathetic or other cholinergic nerve fibers (e.g., atropine).

anticholinergic (an´tīkō´linur´jik),

n (parasympatholytic, cholinolytic), a drug that acts to inhibit the effects of the neurohormone acetylcholine or to inhibit its cholinergic neuroeffects. A cholinergic blocking agent.

anticholinergic

blockade of acetylcholine receptors, resulting in the inhibition of the transmission of parasympathetic nerve impulses; parasympatholytic. Used most commonly in the nonspecific treatment of vomiting or diarrhea; includes atropine, propantheline, scopolamine, isopropamide.
References in periodicals archive ?
Editor's Note: Many newer drugs to treat these conditions do not have anticholinergic effects, such as the antidepressant Prozac[R] and antihistamines such as loratadine (Claritin[R]).
For those taking the highest doses of anticholinergic drugs over the study period, the relative risk of dementia was increased by a statistically significant 54% compared with no use.
Anticholinergic drugs for adult neurogenic detrusor overactivity: a systematic review and meta-analysis.
For children who are not controlled by anticholinergic therapy and clean intermittent catheterisation, other options need to be explored, as discussed below.
At 6 months, direct medical costs were similar between the anticholinergic and Botox groups ($1,339 vs.
There are currently very limited treatment options for idiopathic OAB patients who have not achieved bladder control with existing anticholinergic medications.
The proportion of women with complete resolution of urgency incontinence was 13 percent with anticholinergics and 27 percent with onabotulinum toxin-A.
The research found one in five people who were taking drugs with a total score of four or more had died by the end of the two-year study, compared with only 7% per cent of those taking no anticholinergic drugs.
The side effects they describe include anticholinergic effects, extra-pyramidal symptoms, obesity and weight gain, sedation and sleep disturbance, sexual dysfunction, venous thromboembolism, and vital signs.
2]-receptor blockers, ferrous sulfate, and anticholinergic drugs for genitourinary problems.
Anticholinergic agents that show antagonistic effects mainly on muscarinic receptor are thought to be effective in treating OAB.
Anticholinergic drugs contained in inhalers could increase the risk of a heart attack, cardiovascular death or stroke by more than 50%, research showed.