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Pharmacology General 9f3b1146

Neostigmine antagonizes nondepolarizing blockade by all of the following mechanisms, except ?

A
Decreasing the breakdown of Acetylcholine at the motor end plate
B
Preventing K+ efflux from the cell
C
Increasing the release of Acetylcholine at the motor end plate
D
Depolarization of the motor end plate
High-Yield Explanation
Ans. is 'c' i.e., Increasing the release of Acetylcholine at the motor end palate o Anticholinestrases act by inhibiting the action of acetylcholinesterase (an enzyme that degrades acetylcholine by causing its hydrolysis). o Anticholinesterases thus increase the level of acetylcholine at the neuromuscular junction. o Neostigmine also has some additional direct action on cholinergic receptors i.e., it depolarizes motor end plate. o It does not increase the release of ACH. Accumulated ACH acts on prejunctional muscarinic autoreceptors and inhibits the release of ACH.

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