Anticholinergic agent is a substance that blocks the neurotransmitter acetylcholine in the central and the peripheral nervous system. An example of an anticholinergic is dicyclomine. Generally speaking, it reduces the effects mediated by acetylcholine on acetylcholine receptors in neurons through competitive inhibition. The effect is therefore reversible.

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Mechanism of action causing Bronchodilatation
By blocking parasympatc neruo transmittor acetocholine ,anti-cholorinergic drugs promote bronchoconstrictiction,the vagus nerve along the airways release acetylcholine which binds with muscarinic receptors in the smooth muscle and airway sub mucosal glands,by blocking acetylcholine anticholiergics contradict bronchoconstriction

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