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Anticholinergics (anticholinergic agents) are substances that block the action of the acetylcholine (ACh) neurotransmitter at synapses in the central and peripheral nervous system. [ 1 ] [ 2 ] These agents inhibit the parasympathetic nervous system by selectively blocking the binding of ACh to its receptor in nerve cells .
Anticholinergic overdose, both antinicotinic and antimuscarinic, can exert toxic effects on both central and peripheral systems. The following symptoms could be presented: [21] [22] Mydriasis. Mild symptoms include tachycardia, flushed face, mydriasis and blurred vision, fever, dry mouth
Hyoscine butylbromide, also known as scopolamine butylbromide [4] and sold under the brandname Buscopan among others, [5] is an anticholinergic medication used to treat abdominal pain, esophageal spasms, bladder spasms, biliary colic, [6] and renal colic. [7] [8] It is also used to improve excessive respiratory secretions at the end of life. [9]
Scopolamine, an anticholinergic drug, was used to block cholinergic activity in young adults and induce memory impairments similar to those present in the elderly. The memory impairments were reversed when treated with physostigmine , a cholinergic agonist.
Most of the toxic effects of TCAs are caused by four major pharmacological effects. TCAs have anticholinergic effects, cause excessive blockade of norepinephrine reuptake at the preganglionic synapse, direct alpha adrenergic blockade, and importantly they block sodium membrane channels with slowing of membrane depolarization, thus having ...
Other common spasmolytic agents include: methocarbamol, carisoprodol, chlorzoxazone, cyclobenzaprine, gabapentin, metaxalone, and orphenadrine. Thiocolchicoside is a muscle relaxant with anti-inflammatory and analgesic effects and an unknown mechanism of action.
[4] [5] Side effects when used as drugs may include loss of appetite, nausea, vomiting, loose stools, vivid dreams at night, dehydration, rash, bradycardia, peptic ulcer disease, seizures, weight loss, rhinorrhea, salivation, muscle cramps, and fasciculations. [6] [7] ChEIs are indirect-acting parasympathomimetic drugs. [8]
Side effects of doxylamine include dizziness, drowsiness, and dry mouth, among others. [4] Doxylamine is a potent anticholinergic and has a side-effect profile common to such drugs, including blurred vision, dry mouth, constipation, muscle incoordination, urinary retention, mental confusion, and delirium. [18] [7]