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Trihexifenidilo

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).

De un vistazo

  • Trihexyphenidyl is a medicine used to treat movement disorders caused by other medicines.

  • It can also help with muscle stiffness in Parkinson's disease.

  • Take tablets with or just after food, usually three times a day.

  • No dejes de tomarlo de repente, ya que esto puede causar problemas.

  • Common side-effects include a dry mouth, feeling sick, blurred vision, and constipation.

About trihexyphenidyl

Tipo de medicamento

Un medicamento antimuscarínico

Usado para

Unwanted 'extrapyramidal side-effects' caused by some medicines

Disponible como

Tabletas y medicina líquida oral

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 enfermedad de Parkinson, although other medicines are generally preferred.

Before taking trihexyphenidyl

Some 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:

  • Si estás embarazada, intentando tener un bebé o amamantando.

  • Si tienes algún problema con el funcionamiento de tu hígado o el funcionamiento de tus riñones.

  • 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.

  • Si tienes presión arterial alta.

  • Si tienes una condición que causa debilidad muscular, llamada miastenia gravis.

  • If you have ever had a mental health problem called psychosis.

  • Si está tomando otros medicamentos. Esto incluye cualquier medicamento que esté tomando y que esté disponible para comprar sin receta, así como medicamentos herbales y complementarios.

  • Si alguna vez has tenido una reacción alérgica a un medicamento.

How to take trihexyphenidyl

  • Before 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.

Obteniendo el máximo de tu tratamiento

  • Intenta mantener tus citas regulares con tu médico. Esto es para que tu médico pueda verificar tu progreso.

  • 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.

Can trihexyphenidyl cause problems?

Along 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.

Común

trihexyphenidyl side-effects (these affect fewer than 1 in 10 people)


¿Qué puedo hacer si experimento esto?

Boca seca

Try chewing sugar-free gum or sucking sugar-free sweets. If a dry mouth is still troublesome, speak with your pharmacist for advice

Sentirse mal (náuseas) o estar enfermo (vómitos)

Mantente en alimentos simples - evita comidas ricas o picantes

Blurred vision, feeling dizzy

Si esto sucede, no conduzcas y no uses herramientas ni máquinas

Estreñimiento

Intenta comer una dieta equilibrada y beber varios vasos de agua cada día

Difficulty passing urine

If this becomes troublesome, speak with your doctor for advice

Si experimenta otros síntomas que cree que pueden deberse al medicamento, hable con su médico o farmacéutico para obtener más consejos.

How to store trihexyphenidyl

  • Mantenga todos los medicamentos fuera del alcance y la vista de los niños.

  • Almacenar en un lugar fresco y seco, lejos del calor y la luz directos.

Información importante sobre todos los medicamentos

Información importante sobre todos los medicamentos

Nunca tome más de la dosis prescrita. Si sospecha que usted u otra persona podría haber tomado una sobredosis de este medicamento, acuda al departamento de accidentes y emergencias de su hospital local. Lleve el envase con usted, incluso si está vacío.

Este medicamento es para ti. Nunca lo des a otras personas, incluso si su condición parece ser la misma que la tuya.

No guardes medicamentos caducados o no deseados. Llévalos a tu farmacia local, que se encargará de desecharlos por ti.

Si tienes alguna pregunta sobre este medicamento, consulta a tu farmacéutico.

Informar efectos secundarios de un medicamento o vacuna

Si experimenta efectos secundarios, puede reportarlos en línea a través de Sitio web de Yellow Card.

verificador de síntomas

¿Inseguro sobre mezclar medicamentos?

Verifica posibles interacciones entre medicamentos, suplementos y alimentos antes de tomarlos juntos.

Preguntas frecuentes

What kind of effects can I expect from an antimuscarinic medicine like trihexyphenidyl?

Trihexyphenidyl is an antimuscarinic medicine. It works to help reduce unwanted movement disorders, specifically those known as 'extrapyramidal side-effects'. These can include uncontrolled movements of the face and body, tremor, and restlessness. It can also help relieve muscle stiffness, such as in Parkinson's disease.

Are there any specific activities I should avoid while taking trihexyphenidyl besides driving?

Yes, if you experience blurred vision or dizziness, you should not use tools or machines. Additionally, it's recommended to ask your doctor for advice before drinking alcohol as it can increase the possibility of side-effects like feeling sleepy.

What should I do if I've been on trihexyphenidyl for a while and want to stop taking it?

If you have been taking trihexyphenidyl for some time, it's important not to stop taking it suddenly. Stopping abruptly can cause problems. You should speak with your doctor first, as they will likely want to reduce your dose gradually if it becomes necessary to stop the medication.

How should I manage a dry mouth caused by trihexyphenidyl?

If you experience a dry mouth, you can try chewing sugar-free gum or sucking sugar-free sweets. If the dry mouth remains troublesome, you should speak with your pharmacist for further advice.

What should I do if I feel dizzy or my vision becomes blurry while taking this medication?

If you experience blurred vision or feel dizzy while taking trihexyphenidyl, it is important that you do not drive, operate tools, or use machines. These side-effects usually improve as your body adjusts to the medicine, but if they continue or become troublesome, speak with your doctor or pharmacist.

Can I take other medications, including over-the-counter ones, while on trihexyphenidyl?

Before taking any other medicines, including those you can buy without a prescription, as well as herbal and complementary medicines, you should check with a pharmacist to ensure they are safe to take with trihexyphenidyl. Specifically, some antihistamines and strong painkillers can interact with trihexyphenidyl and increase the risk of side-effects.

What's the best way to remember to take my doses regularly?

To help you remember your doses, try to take trihexyphenidyl at the same times each day. The tablets should be taken with or just after a meal.

Lecturas adicionales y referencias

Sobre el autorVer biografía completa

Imagen del autor

Michael Stewart, MRPharmS

Gerente de Revisión de Folletos de Medicamentos – Contratista, Farmacéutico

BPharm (Hons), MRPharmS

Michael es un farmacéutico comunitario que ejerce en Midlands y South Yorkshire con más de 20 años de experiencia asesorando sobre medicamentos y condiciones médicas. Tiene una sólida formación en capacitación en atención médica, habiendo producido e impartido cursos de formación para equipos de farmacia y personal de entornos de atención residencial, incluidas enfermeras. También ha contribuido a juntas asesoras de farmacia para la gestión de condiciones de baja gravedad en la comunidad.

Acerca del revisor

Imagen del autor

Sid Dajani

Sultan Dajani se graduó en la Escuela de Farmacia de Londres en 1994 y se convirtió en el miembro más joven elegido para el consejo de la Sociedad Real de Farmacia desde su fundación en 1842.

Historial del artículo

La información en esta página está escrita y revisada por pares por clínicos calificados.

  • Próxima revisión: 6 de agosto de 2026
  • 7 Ago 2023 | Última versión

    Última actualización por

    Michael Stewart, MRPharmS

    Revisado por pares por

    Sid Dajani
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