Description

Trihexyphenidyl tablets are an anticholinergic medicine mainly used to treat movement problems caused by Parkinson’s disease (parkinsonism) and to control drug‑induced movement side effects from certain psychiatric medicines .Main uses of trihexyphenidyl tabletsTrihexyphenidyl is prescribed for:Parkinson’s disease and parkinsonism: To reduce stiffness (rigidity), tremors, shaking, and excessive salivation in Parkinson’s disease and other forms of parkinsonism (like post‑encephalitic or arteriosclerotic) Drug‑induced extrapyramidal symptoms (EPS): To treat abnormal movements caused by antipsychotic drugs, such as:Tremor, slurred speech, stiffness, and slow movements (parkinsonism‑like symptoms).Akathisia (inner restlessness and inability to sit still).Dystonia (muscle spasms) and dyskinesias (involuntary movements) .Sometimes it is also used off‑label (at the doctor’s discretion) for other movement disorders or to reduce certain side effects from certain drugs .How it worksTrihexyphenidyl is an anticholinergic (antimuscarinic) drug that blocks acetylcholine, a chemical messenger in the brain and nerves . In Parkinson’s disease, there is an imbalance between acetylcholine and dopamine; by reducing the effect of acetylcholine, it helps restore balance and improve muscle control, rigidity, and tremor .In drug‑induced movement disorders, it counteracts the dopamine‑blocking effect of antipsychotic medicines, thereby reducing tremors and abnormal movements .Typical dosage and how to takeTrihexyphenidyl comes as tablets (usually 2 mg or 5 mg) and an oral liquid .It is usually taken 2–4 times a day, at around the same times each day, with or without food .The dose is started low (often 0.5–1 mg once or twice a day) and gradually increased until symptoms are controlled, while minimizing side effects .For Parkinson’s disease, a common maintenance dose is 2–6 mg per day in divided doses, but some patients may need up to 15 mg daily .For drug‑induced EPS, the daily dose is usually in the range of 2–15 mg, depending on the severity .Important:Take exactly as prescribed; do not skip doses or change the dose without consulting the doctor .If a dose is missed, take it as soon as remembered, but skip if it is close to the next dose Who should avoid trihexyphenidylTrihexyphenidyl should generally be avoided or used with extreme caution in people with:Glaucoma (especially narrow‑angle glaucoma) .Prostate problems (enlarged prostate, urinary retention) Severe stomach or bowel problems (e.g., obstruction, paralytic ileus, severe constipation) .Myasthenia gravis (can worsen muscle weakness) .Severe heart disease, tachycardia (fast heart rate), or a history of heart rhythm problems .Severe dementia or confusion, especially in the elderly .It should also be used cautiously in children, elderly people, and those with liver or kidney problems .Common side effectsCommon side effects include:Dry mouth .Blurred vision, eye discomfort .Constipation .Difficulty urinating .Dizziness, drowsiness, or feeling unsteady .Nausea, vomiting .Flushed or dry skin .Serious side effects (seek medical help)Contact a doctor immediately if any of these occur:Confusion, hallucinations, agitation, or worsening dementia .Severe dizziness or fainting .Fast or irregular heartbeat .Trouble passing urine, severe abdominal pain, or bloating .Signs of high body temperature (overheating, especially in hot weather) due to reduced sweating .Signs of an allergic reaction (rash, itching, swelling, difficulty breathing) .Important precautionsInform the doctor about all other medicines being taken, especially:Antipsychotics (e.g., haloperidol, chlorpromazine).Other anticholinergics (e.g., diphenhydramine, some antihistamines, some antidepressants).Medicines for bladder or stomach problems.Sedatives, sleeping pills, or alcohol (can increase drowsiness) Avoid alcohol while taking trihexyphenidyl, as it can worsen drowsiness and dizziness .Be cautious with activities like driving or operating machinery, especially when starting the medicine or increasing the dose .Regular eye check‑ups are recommended, especially if there is a history of glaucoma .Do not stop the medicine suddenly; dose should be tapered under a doctor’s guidance to avoid worsening of symptoms Important noteTrihexyphenidyl tablets are a prescription medicine and should only be used under the supervision of a doctor The exact dose, duration, and suitability depend on the person’s condition, age, other illnesses, and other medicines being used