Nervous System Home > Side Effects of Trihexyphenidyl
Blurred vision, mild nervousness, and dry mouth are some of the common side effects of trihexyphenidyl. Up to 30 to 50 percent of people who take the medication develop side effects, but these side effects are often minor and generally improve over time. However, there are also some rare but potentially serious trihexyphenidyl side effects that require immediate medical attention, including heatstroke, confusion, and hallucinations.
- Glaucoma (an eye condition)
- Fever, heatstroke, or decreased sweating
- Severe constipation (which may be a sign of an intestinal blockage)
- A rapid heart rate (tachycardia)
- Difficulty passing urine
- Feeling the need to take trihexyphenidyl more often or at higher doses than prescribed, especially to achieve euphoric feelings
- Signs of an allergic reaction, including:
- An unexplained rash
- Swelling of the mouth or throat
- Difficulty breathing.