What is the antidote for anticholinergic poisoning, such as from insecticides?

The antidote for anticholinergic poisoning is indeed atropine, which is a muscarinic antagonist that can effectively counteract the effects of excess acetylcholine caused by anticholinergic agents. When someone experiences anticholinergic poisoning, symptoms can include dilated pupils, dry mouth, flushed skin, urinary retention, constipation, and, in severe cases, altered mental status and seizures. Atropine works by inhibiting the action of acetylcholine at muscarinic receptors, thereby alleviating many of these symptoms.

The other substances listed do not serve as antidotes for anticholinergic poisoning. Naloxone is an opioid antagonist used primarily for opioid overdoses. Flumazenil is a benzodiazepine antagonist utilized in cases of benzodiazepine overdose, while benzodiazepines themselves are used to manage anxiety and seizures but do not address the underlying mechanisms of anticholinergic toxicity. Therefore, atropine is the appropriate and effective choice in this situation.