Trihexyphenidyl is used to treat symptoms of Parkinsons disease (stiffness, tremors, spasms, poor muscle control).
Trihexyphenidyl is also used to treat and prevent Parkinson-like symptoms that are caused by using certain anti-psychotic medications.
Follow all directions on your prescription label and read all medication guides or instruction sheets. Use the medicine exactly as directed.
Measure liquid medicine carefully. Use the dosing syringe provided, or use a medicine dose-measuring device (not a kitchen spoon).
Your doctor will tell you whether you should take trihexyphenidyl before or after a meal.
Take the medicine with food if it upsets your stomach.
If trihexyphenidyl causes your mouth to feel dry, you may need to take it before meals.
You may also use mints, chewing gum, or water if you have a very dry mouth or you feel very thirsty.
The pressure inside your eyes will need to be checked while you are taking trihexyphenidyl.
You should not stop using trihexyphenidyl suddenly. Stopping suddenly may make your condition worse.
Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
blurred vision, tunnel vision, eye pain, or seeing halos around lights;
hot and dry skin, or a lack of sweating even if you feel hot;
rapid or jerky repetitive involuntary movement;
painful or difficult urination;
unusual thoughts or behavior;
confusion, memory problems; or
severe nervous system reaction--very stiff (rigid) muscles, high fever, sweating, confusion, fast or uneven heartbeats, tremors, feeling like you might pass out.
Common side effects may include:
constipation, decreased urination;
dizziness, drowsiness, weakness;
feeling restless or nervous.
Store at room temperature away from moisture, heat, and light. Do not freeze.
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.
Overdose symptoms may include severe drowsiness, fever, dilated pupils, feeling hot, paleness in your face, dry skin and mouth, hallucinations, paranoia, agitation, seizure, or numbness in or around your mouth, nose, or throat.