Class	Drugs
Antiarrhythmics	Disopyramide (Norpace); procainamide (Pronestyl); quinidine
Anticholinergics (selected)	Atropine (Atreza); belladonna alkaloids; dicyclomine (Bentyl); flavoxate (Urispas); glycopyrrolate (Robinul); hyoscyamine (Levsin); oxybutynin (Ditropan); propantheline (Pro-Banthine*); scopolamine (Transderm Scop)
Antidepressants	Amitriptyline (Elavil*); amoxapine; doxepin (Sinequan*); imipramine (Tofranil); maprotiline (Ludiomil*); nortriptyline (Pamelor)
Antihistamines (selected)	Brompheniramine (Brovex); chlorpheniramine (Chlor-Trimeton); cyproheptadine (Periactin*); diphenhydramine (Benadryl); hydroxyzine (Atarax*)
Antihypertensives	Hydralazine; nifedipine (Procardia)
Antiparkinsonian agents	Amantadine (Symmetrel); benztropine (Cogentin); bromocriptine (Parlodel); levodopa (Larodopa*)†; trihexyphenidyl (Artane*)
Antipsychotics	Chlorpromazine (Thorazine*); fluphenazine (Prolixin*); haloperidol (Haldol); prochlorperazine (Compazine*); thioridazine (Mellaril*); thiothixene (Navane)
Hormonal agents	Estrogen; progesterone; testosterone
Muscle relaxants	Baclofen (Lioresal); cyclobenzaprine (Flexeril); diazepam (Valium)
Sympathomimetics (alpha-adrenergic agents)	Ephedrine; phenylephrine (Neo-Synephrine); phenylpropanolamine‡; pseudoephedrine (Sudafed)
Sympathomimetics (beta-adrenergic agents)	Isoproterenol (Isuprel); metaproterenol (Alupent); terbutaline (Brethine*)
Miscellaneous	Amphetamines; carbamazepine (Tegretol); dopamine (Intropin*); mercurial diuretics; nonsteroidal anti-inflammatory drugs (e.g., indomethacin [Indocin]); opioid analgesics (e.g., morphine [Duramorph]); vincristine (Vincasar PFS)