WHEN COMCOMITANTLY USED WITH DRUGS SUCH AS CERTAIN NARCOTIC ANALGESIC SUCH AS MEPERIDINE, PHENOTHIAZINES AND OTHER ANTIPSYCHOTICS, TRICYCLIC ANTIDEPRESSANTS, CERTAIN ANTIHISTAMINICS AND CERTAIN ANTIARRHYTHMICS LIKE QUINIDINE THAT HAVE SECONDARY ANTI-CHOLINERGIC ACTIONS, MAY PRODUCE CENTRAL ANTICHOLINERGIC SYNDROME(THE EFFECTS OF ATROPINE AND OTHER ANTIMUSCARINICS MAY BE ENHANCED ). MAO INHIBITORS MAY POSSIBLY ENHANCE THE EFFECTS OF ANTIMUSCARINICS. ANTIMUSCARINICS AND PARASYMPATHOMIMETICS MAY COUNTERACT EACH OTHER EFFECTS