Tell the doctor if the patient is taking any other medicines: Prescribed medicines, especially: Tricyclic antidepressants.
Drugs for Parkinson's disease.
Some antihistamines.
Antispasmodics (e.g. for irritable bowel syndrome).
Phenothiazines (for mental illness).
Disopyramide or quinidine (for heart problems).
Any medicines available without prescription.
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