What are the symptoms of anticholinergic toxicity?

Anticholinergic toxicity is characterized by a distinct set of symptoms caused by the blockade of acetylcholine at muscarinic receptors. The correct answer highlights mydriasis (dilated pupils), anhidrosis (lack of sweating), and vasodilation, which are key features associated with this type of toxicity.

Mydriasis occurs due to the inhibition of the parasympathetic nervous system's control over the iris sphincter muscle, leading to pupil dilation. Anhidrosis results from the suppression of secretions from sweat glands, which are also under parasympathetic control, leading to reduced ability to sweat. Vasodilation can occur due to the loss of the typical vasoconstrictive control exerted by the sympathetic nervous system, which can sometimes be exaggerated in the presence of anticholinergic agents.

In contrast, symptoms such as bradycardia and excessive salivation are more indicative of cholinergic toxicity, where there is an overstimulation of muscarinic receptors rather than an inhibition. Similarly, responses involving diarrhea, urination, and muscle spasms signify increased cholinergic activity and are not seen in anticholinergic poisoning. Excessive sweating and lacrimation can also arise from cholin