Antilirium is a derivative of the Calabar bean, and its active moiety, physostigmine, is also known as eserine. Physostigmine is used to reverse the effect upon the nervous system caused by clinical or toxic dosages of drugs and herbs capable of producing the anticholinergic syndrome. Some of the drugs responsible are: amitriptyline, amoxapine, atropine, benztropine, biperiden, clidinium, cyclobenzaprine, desipramine, doxepin, hyoscyamine, imipramine, lorazepam, maprotiline, nortriptyline, protriptyline, propantheline, scopolamine, trimipramine. Some herbals that can elicit the anticholinergic syndrome are black henbane, deadly nightshade, Devil's apple, Jimson weed, Loco seeds or weeds, Matrimony vine, night blooming jessamine, stinkweed.