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What is Trihexyphenidyl used for?

Trihexyphenidyl is an antiparkinsonian drug that is used to treat Parkinson's disease. This medication belongs to a class of drugs called antidyskinetics, which alters unusual nerve impulses, improves muscle control, relaxes stiff muscles, as well as provides relief from spasms and tremors. This medicine may also be used to treat other conditions as determined by your doctor.

What is the recommended dosage of Trihexyphenidyl?

The dosage of Trihexyphenidyl prescribed to each patient will vary. Always follow your physician’s instructions and/or the directions on the prescription drug label. Take Trihexyphenidyl with a full glass of water. This medication may be taken with food to lessen stomach upset.

What if you miss a dose of Trihexyphenidyl?

If your physician has instructed or directed you to take Trihexyphenidyl medication in a regular schedule and you have missed a dose of this medicine, take it as soon as you remember. However, if it is almost time for your next dose, then skip the missed dose and go back to your regular dosing schedule. Do not double the doses unless otherwise directed.

What if you overdose on Trihexyphenidyl?

Any medication taken in excess can have serious consequences. If you suspect an overdose of Trihexyphenidyl, seek medical attention immediately. Some of the overdose symptoms of this drug are fast or irregular heartbeat, flushed face, hallucinations, hyperactivity, and loss of consciousness.

What other drugs could interact with Trihexyphenidyl?

It may be noted that drugs other than those listed above may also interact with Trihexyphenidyl.

Usually drug interactions occur when it is taken with another drug or with food. Before you take a medication for a particular ailment, you should inform the health expert about intake of any other medications including non-prescription medications, over-the-counter medicines that may increase the effect of Trihexyphenidyl, and dietary supplements like vitamins, minerals and herbal, so that the doctor can warn you of any possible drug interactions.

Trihexyphenidyl can interact with tricyclic antidepressants, acetylcholinesterase inhibitors, anticholinergic drugs, and antihistamines.

Do let your doctor know if you smoke, consume alcohol or caffeinated drinks, or use illegal drugs as these may interfere with the action of your medication. Make sure to inform your doctor of any medical conditions you may have, or any family history of medical problems. Do not start or stop using any medicine without consulting your doctor.

What are the side effects of Trihexyphenidyl?

Like other medicines, Trihexyphenidyl can cause some side effects. If they do occur, the side effects of Trihexyphenidyl are most likely to be minor and temporary. However, some may be serious and may require the individual to inform the doctor or visit the nearest hospital immediately.

It is pertinent to note that side effects of Trihexyphenidyl cannot be anticipated. If any side effects of Trihexyphenidyl develop or change in intensity, the doctor should be informed as soon as possible.

Trihexyphenidyl can cause side effects such as anxiety, dizziness, blurred vision, dry mouth, constipation, and nervousness. Some of the serious side effects of this drug are difficulty breathing, loss of consciousness, confusion, seizures, fever, irregular heartbeats and swelling of the lips, tongue, or face. This is not a complete list of all side effects. Do concur with your doctor and follow his directions completely when you are taking Trihexyphenidyl.

What are the questions to ask your doctor before taking Trihexyphenidyl?

Is it possible for me to take Trihexyphenidyl with other drugs?
Should certain beverages, foods and other products be avoided when I take Trihexyphenidyl?
What are the possible drug interactions of Trihexyphenidyl?
How will Trihexyphenidyl work in my body?
How should Trihexyphenidyl be taken?
How to reduce the risk of Trihexyphenidyl drug interactions and side effects?


The health and medical information provided here is intended to supplement and not substitute for the expertise and judgment of your physician, pharmacists or other health care professional. Before taking Trihexyphenidyl, inform your doctor if you have epilepsy, heart disease, liver disease, kidney disease, irregular heartbeat, and depression. Caution must be exercised when driving or operating machinery. Avoid becoming overheated while using this medicine.


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