The combination of dilated pupils (mydriasis), dry skin, and tachycardia is characteristic of an anticholinergic toxidrome, caused by excessive blockade of muscarinic acetylcholine receptors. Other possible findings include dry mouth, urinary retention, decreased bowel sounds, flushing, agitation, confusion, and sometimes delirium. Common causes include certain antihistamines, tricyclic antidepressants, atropine-like drugs, and some plants containing anticholinergic compounds.
A patient exhibits dilated pupils, dry skin, and tachycardia after ingesting an unknown poison. Which type of toxin is most likely involved?
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