Medication class or substance	Examples
Analgesics	Opiates
Anticholinergics	Tricyclic antidepressants
Anticonvulsants	Phenytoin (Dilantin), phenobarbital
Antidepressants	Lithium, monoamine oxidase inhibitors, selective serotonin reuptake inhibitors, tricyclic antidepressants
Antihistamines	Dimenhydrinate, diphenhydramine (Benadryl), hydroxyzine (Vistaril), meclizine (Antivert), promethazine (Phenergan)
Antihypertensives	Alpha blockers, beta blockers, calcium channel blockers, clonidine (Catapres), methyldopa, reserpine
Anti-Parkinson agents	Bromocriptine (Parlodel), levodopa, trihexyphenidyl
Cardiovascular agents	Digoxin, disopyramide (Norpace), gemfibrozil (Lopid)
Cytotoxic agents	Methotrexate
Diuretics	Spironolactone (Aldactone), thiazides
Hormones	5-alpha reductase inhibitors, corticosteroids, estrogens, luteinizing hormone-releasing hormone agonists, progesterone
Illicit drugs, alcohol, and nicotine	Amphetamines, barbiturates, cocaine, heroin, marijuana
Immunomodulators	Interferon-alfa
Tranquilizers	Benzodiazepines, butyrophenones, phenothiazines