Final answer:
Atropine is the standard treatment for muscarinic poisoning, as it blocks the excess acetylcholine activity, and is often used in conjunction with Pralidoxime chloride that reactivates the inhibited enzyme acetylcholinesterase.
Step-by-step explanation:
The treatment for muscarinic poisoning is the use of Atropine. It acts as an antagonist to muscarinic acetylcholine receptors, thus blocking the effects of excess acetylcholine. Atropine administration continues until the clearing of bronchial secretions, which is a primary endpoint for treatment efficiency. Alongside Atropine, Pralidoxime chloride (also known as 2-PAMCI) is also used in the treatment regime, specifically to reactivate the enzyme acetylcholinesterase by removing the phosphoryl group that inhibits it due to nerve agent poisoning.