• Basic Info
• Top Questions
• Clinical Info

What is this medicine?

TRIHEXYPHENIDYL (trye hex ee FEN i dil) is for Parkinsonism or for movement problems caused by certain drugs.

This medicine may be used for other purposes; ask your health care provider or pharmacist if you have questions.

What should I tell my health care provider before I take this medicine?

They need to know if you have any of these conditions:

• glaucoma
• heart disease
• high blood pressure
• kidney disease
• liver disease
• prostate problems
• an unusual or allergic reaction to trihexyphenidyl, other medicines, lactose, foods, dyes, or preservatives
• pregnant or trying to get pregnant
• breast-feeding

How should I use this medicine?

Take this medicine by mouth. Follow the directions on the prescription label. Use a specially marked spoon or container to measure your medicine. Ask your pharmacist if you do not have one. Household spoons are not accurate. Ask your doctor or pharmacist if you should take this medicine with or without food. Take your medicine at regular intervals. Do not take your medicine more often than directed. Do not stop taking except on your doctor's advice.

Talk to your pediatrician regarding the use of this medicine in children. Special care may be needed.

Overdosage: If you think you have taken too much of this medicine contact a poison control center or emergency room at once.
NOTE: This medicine is only for you. Do not share this medicine with others.

What if I miss a dose?

If you miss a dose, take it as soon as you can. If it is almost time for your next dose, take only that dose. Do not take double or extra doses.

What may interact with this medicine?

• atropine
• antihistamines for allergy, cough and cold
• certain medicines for bladder problems like oxybutynin, tolterodine
• certain medicines for stomach problems like dicyclomine, hyoscyamine
• certain medicines for Parkinson's disease like benztropine
• certain medicines for travel sickness like scopolamine
• ipratropium

This list may not describe all possible interactions. Give your health care provider a list of all the medicines, herbs, non-prescription drugs, or dietary supplements you use. Also tell them if you smoke, drink alcohol, or use illegal drugs. Some items may interact with your medicine.

What should I watch for while using this medicine?

Your mouth may get dry. Chewing sugarless gum or sucking hard candy, and drinking plenty of water may help. Contact your doctor if the problem does not go away or is severe.

This medicine may cause dry eyes and blurred vision. If you wear contact lenses you may feel some discomfort. Lubricating drops may help. See your eye doctor if the problem does not go away or is severe. Your doctor or health care professional may want you to have eye exams while you are taking this medicine.

You may get drowsy or dizzy. Do not drive, use machinery, or do anything that needs mental alertness until you know how this medicine affects you. Do not stand or sit up quickly, especially if you are an older patient. This reduces the risk of dizzy or fainting spells. Alcohol may interfere with the effect of this medicine. Avoid alcoholic drinks.

Last Updated: September 03, 2009