In the United States, the American Association of Poison Control Centers at 800-222-1222 is available 24 hours a day to connect callers directly to their region's poison center. They are also available online.

Anticholinergic syndrome follows exposure to substances that are muscarinic receptor antagonists. Clinical effects include tachycardia, delirium, hallucinations, mydriasis, dry skin and mucous membranes, urinary retention, decreased gastric motility, and occasionally hyperthermia.

Implicated medications include anticholinergics such as atropine, benztropine, and scopolamine; antihistamines such as diphenhydramine; antipsychotics such as clozapine and quetiapine, antispasmodics such as dicyclomine and oxybutynin; tricyclic antidepressants such as amitriptyline and imipramine; and muscle relaxants such as cyclobenzaprine.

Some plants such as Jimson weed (Datura stramonium) and deadly nightshade, also known as belladonna (Atropa belladonna), have anticholinergic properties.

Related topic: poisoning caused by sedative