Trihexyphenidyl
נבדק על ידי Sid Dajaniעודכן לאחרונה על ידי Michael Stewart, MRPharmSLast updated 7 Aug 2023
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Trihexyphenidyl is usually prescribed to relieve unwanted side-effects caused by certain other medicines.
When starting your treatment your doctor will give you a small dose and will then gradually increase your dose every few days. This helps your body adjust to the medicine and reduces the risk of side-effects. Take it exactly as your doctor tells you to.
The most common side-effects are a dry mouth, constipation, blurred vision, and feeling sick (nausea).
At a glance
Trihexyphenidyl is a medicine used to treat movement disorders caused by some other medicines.
It can also relieve muscle stiffness in people with Parkinson's disease.
Take tablets with or just after a meal, exactly as your doctor tells you.
Your doctor will gradually increase your dose when you start treatment.
Common side-effects include dry mouth, feeling sick, blurred vision, and dizziness.
Do not suddenly stop taking trihexyphenidyl; your doctor will gradually reduce the dose.
Do not drink alcohol or take other medicines without asking your doctor or pharmacist.
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המשך לקרוא למטה
About trihexyphenidyl
סוג התרופה | An antimuscarinic medicine |
שימוש עבור | Unwanted 'extrapyramidal side-effects' caused by some medicines |
זמין כ | טבליות ותרופות נוזליות לבליעה |
Trihexyphenidyl is an antimuscarinic medicine. It is prescribed for people who have unwanted movement disorders as a side-effect of taking certain other medicines, such as some antipsychotic medicines. These movement disorders are often referred to as 'extrapyramidal side-effects' and include things like uncontrolled face and body movements, tremor, and restlessness.
Trihexyphenidyl can also be given to relieve muscle stiffness in people with מחלת פרקינסון, although other medicines are generally preferred.
Before taking trihexyphenidyl
חזרה לתוכןSome medicines are not suitable for people with certain conditions, and sometimes a medicine may only be used if extra care is taken. For these reasons, before you start taking trihexyphenidyl it is important that your doctor knows:
אם את בהריון, מנסה להיכנס להריון או מניקה.
If you have any problems with the way your liver works, or the way your kidneys work.
If you have any problems with your heart or blood vessels.
If you have prostate problems, or if you have been experiencing difficulty passing urine.
If you have been constipated for more than a week.
If you have a condition which causes raised pressure in your eyes, such as glaucoma.
אם יש לך לחץ דם גבוה.
אם יש לך מצב הגורם לחולשת שרירים, הנקרא מיאסטניה גרביס.
If you have ever had a mental health problem called psychosis.
אם אתה נוטל תרופות אחרות כלשהן. זה כולל כל תרופה שאתה נוטל שניתן לרכוש ללא מרשם, כמו גם תרופות צמחיות ומשלימות.
אם אי פעם הייתה לך תגובה אלרגית לתרופה.
המשך לקרוא למטה
How to take trihexyphenidyl
חזרה לתוכןBefore you start this treatment, read the manufacturer's printed information leaflet from inside your pack. It will give you more information about trihexyphenidyl and will provide you with a full list of the side-effects which you may experience from taking it.
Take trihexyphenidyl exactly as your doctor tells you to. When starting your treatment your doctor will give you a small dose (usually 1 mg daily) and will then gradually increase your dose every few days. Carefully follow the directions your doctor gives to you. Once you are on a full dose, it is likely that you will be taking three doses of trihexyphenidyl a day, although it may be more or less often than this.
Trihexyphenidyl tablets should be taken with or just after a meal. Try to take your doses at the same times of day each day, as this will help you to remember to take your doses regularly.
If you forget to take a dose, take it as soon as you remember unless your next dose is due. If it is nearly time for your next dose then take the next dose when it is due but leave out the forgotten dose. Do not take two doses together to make up for a missed dose.
להפיק את המרב מהטיפול שלך
חזרה לתוכןנסה לשמור על הפגישות הקבועות שלך עם הרופא. זה כדי שהרופא יוכל לבדוק את ההתקדמות שלך.
If you buy any medicines, check with a pharmacist that they are safe to take with trihexyphenidyl. Some antihistamines and some strong painkillers can interfere with trihexyphenidyl and increase the risk of side-effects.
If you are having an operation or any dental treatment, tell the person carrying out the treatment that you are taking trihexyphenidyl.
If you have been taking trihexyphenidyl for some time, do not stop taking it without speaking with your doctor first. Stopping suddenly can cause problems so your doctor will want to reduce your dose gradually if this becomes necessary.
Ask your doctor for advice before drinking alcohol while you are on trihexyphenidyl. Your doctor may recommend you do not drink alcohol because it increases the possibility of side-effects such as feeling sleepy.
המשך לקרוא למטה
Can trihexyphenidyl cause problems?
חזרה לתוכןAlong with their useful effects, most medicines can cause unwanted side-effects although not everyone experiences them. The table below contains some of the most common ones associated with trihexyphenidyl. You will find a full list in the manufacturer's information leaflet supplied with your medicine. The unwanted effects usually improve as your body adjusts to the new medicine, but speak with your doctor or pharmacist if any of the following continue or become troublesome.
Common trihexyphenidyl side-effects (these affect fewer than 1 in 10 people) | מה אני יכול לעשות אם אני חווה את זה? |
יובש בפה | Try chewing sugar-free gum or sucking sugar-free sweets. If a dry mouth is still troublesome, speak with your pharmacist for advice |
תחושת חולי (בחילה) או להיות חולה (הקאה) | היצמד למאכלים פשוטים - הימנע ממאכלים עשירים או חריפים |
Blurred vision, feeling dizzy | אם זה קורה, אל תנהג ואל תשתמש בכלים או במכונות |
עצירות | Try to eat a well-balanced diet and drink several glasses of water each day |
קושי במתן שתן | If this becomes troublesome, speak with your doctor for advice |
אם אתה חווה תסמינים נוספים שלדעתך עשויים להיות כתוצאה מהתרופה, פנה לרופא או לרוקח שלך לקבלת ייעוץ נוסף.
How to store trihexyphenidyl
חזרה לתוכןשמור את כל התרופות מחוץ להישג ידם וראייתם של ילדים.
יש לאחסן במקום קריר ויבש, הרחק מחום ואור ישיר.
מידע חשוב על כל התרופות
חזרה לתוכןמידע חשוב על כל התרופות
לעולם אל תיקח יותר מהמינון שנקבע. אם אתה חושד שאתה או מישהו אחר אולי לקח מנת יתר של תרופה זו, פנה למחלקת תאונות וחירום בבית החולים המקומי שלך. קח את המיכל איתך, אפילו אם הוא ריק.
תרופה זו מיועדת עבורך. לעולם אל תיתן אותה לאנשים אחרים, גם אם מצבם נראה דומה לשלך.
אל תשמרו תרופות שפג תוקפן או שאינן רצויות. קחו אותן לבית המרקחת המקומי שלכם שיטפל בהן עבורכם.
אם יש לך שאלות לגבי התרופה הזו, שאל את הרוקח שלך.
דווח על תופעות לוואי לתרופה או חיסון
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שאלות נפוצות
What kind of movement disorders does trihexyphenidyl help with?
Trihexyphenidyl is used to treat unwanted movement disorders that can be a side-effect of certain other medicines, especially some antipsychotics. These are often called 'extrapyramidal side-effects' and can include uncontrolled movements of the face and body, tremor, and restlessness. It can also help relieve muscle stiffness in people with Parkinson's disease, but other medicines are usually preferred for this.
Is it safe to take trihexyphenidyl if I'm taking other medications?
You should tell your doctor about all medicines you are currently taking, including those bought without a prescription, as well as herbal and complementary medicines. Some antihistamines and strong painkillers can interact with trihexyphenidyl, potentially increasing the risk of side-effects. Always check with a pharmacist if you buy any new medicines while taking trihexyphenidyl to ensure they are safe to use together.
What should I do if I forget to take a dose of trihexyphenidyl?
If you forget to take a dose, take it as soon as you remember, unless it's almost time for your next scheduled dose. In that case, skip the missed dose and just take your next dose when it's due. Do not take two doses together to compensate for a forgotten one.
Can I stop taking trihexyphenidyl if I feel better?
No, if you have been taking trihexyphenidyl for some time, you should not stop taking it suddenly without first speaking to your doctor. Stopping abruptly can cause problems. Your doctor will devise a plan to reduce your dose gradually if it becomes necessary to stop the medication.
Are there any precautions I should take if I need an operation or dental treatment?
Yes, if you are due to have an operation or any dental treatment, it is important to inform the person carrying out the treatment that you are taking trihexyphenidyl.
What should I do if I experience dry mouth or constipation as side-effects?
For dry mouth, try chewing sugar-free gum or sucking sugar-free sweets. If it remains troublesome, speak to your pharmacist for advice. For constipation, aim to eat a well-balanced diet and drink several glasses of water daily. If difficulty passing urine becomes a problem, you should speak with your doctor for advice.
What if I accidentally take too much trihexyphenidyl?
Never take more than your prescribed dose. If you suspect that you or someone else has taken an overdose of trihexyphenidyl, you should go to the accident and emergency department of your local hospital immediately. Remember to bring the medicine container with you, even if it is empty.
קריאה נוספת והפניות
- Manufacturer's PIL, Trihexyphenidyl 2 mg Tablets; Genus Pharmaceuticals, The electronic Medicines Compendium. Dated July 2016.
- תרופות מלאות BNF מהדורה 89; האגודה הרפואית הבריטית והחברה המלכותית לפרמקולוגיה של בריטניה הגדולה, לונדון.
המשך לקרוא למטה
About the authorView full bio

מייקל סטיוארט, MRPharmS
Medicine Leaflet Review Manager – Contractor, Pharmacist
BPharm (Hons), MRPharmS
Michael is a community pharmacist practicing in the Midlands and South Yorkshire with more than 20 years’ experience advising on medicines and medical conditions. He has a strong background in healthcare training, having produced and delivered training courses for pharmacy teams and staff of residential care settings, including nurses. He has also contributed to pharmacy advisory boards for the management of low acuity conditions in the community.
About the reviewer

סיד דג'אני
Sultan Dajani qualified at the London School of Pharmacy in 1994 and became the youngest elected member of the Royal Pharmaceutical Society council since its founding in 1842.
היסטוריית המאמר
המידע בעמוד זה נכתב ונבדק על ידי קלינאים מוסמכים.
Next review due: 6 Aug 2026
7 Aug 2023 | הגרסה האחרונה

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