Some (common) causes of anticholinergic syndrome

Antihistamines: promethazine / doxylamine / chlorpheniramine / dexchlorpheniramine

Antipsychotics: quetiapine / olanzapine / chlorpromazine / clozapine / zuclopenthixol

Anticholinergics: benztropine, atropine, glycopyrrolate, hyoscyamine, oxybutynine

Miscellanous medications: carbamazepine

Cyclic antidepressants: amitriptyline, doxepin, clomipramine, nortriptyline

Topical occular mydriatics: cyclopentolate, homatropine, tropicamide

Plants: Atropa belladonna (deadly nightshade); Datura stramonium (jimson weed); Datura suaveolens (Angel’s trumpet); some Amanita mushrooms