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Aparasympathomimetic drug, sometimes called a cholinomimetic drug[1]orcholinergic receptor stimulating agent,[2] is a substance that stimulates the parasympathetic nervous system (PSNS).[3][2] These chemicals are also called cholinergic drugs because acetylcholine (ACh) is the neurotransmitter used by the PSNS.[1][4] Chemicals in this family can act either directly by stimulating the nicotinicormuscarinic receptors (thus mimicking acetylcholine), or indirectly by inhibiting cholinesterase, promoting acetylcholine release, or other mechanisms.[5] Common uses of parasympathomimetics include glaucoma, Sjögren syndrome and underactive bladder.[6]
Some chemical weapons such as sarinorVX, non-lethal riot control agents such as tear gas, and insecticides such as diazinon fall into this category.
For a cholinergic agent, the following criteria describe the structure activity relationship:
These act by stimulating the nicotinicormuscarinic receptors.
Indirect acting parasympathomimetic substances may be either reversible cholinesterase inhibitors, irreversible cholinesterase inhibitors or substances that promote ACh release or anti-adrenergics. The latter inhibits the antagonistic system, the sympathetic nervous system.
Parasympathomimetics are a group of drugs that act either by directly stimulating the muscarinic receptor, for example pilocarpine, or by inhibiting the enzyme acetylcholinesterase, which hydrolyses the acetylcholine in the synapse.
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Types |
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Classes |
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Sympathomimetics |
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Parasympathomimetics |
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Carbonic anhydrase inhibitors/ (sulfonamides) |
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Beta blocking agents |
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Prostaglandin analogues (F2α) |
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Other agents |
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