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Clomethiazole

Swallow the capsules whole with a drink of water. Do not chew them.

Clomethiazole will make you sleepy. If you still feel sleepy the next day, do not drive and do not use tools or machines.

Do not drink alcohol whilst being treated with clomethiazole.

The most common side-effects are a runny or blocked nose, and headache. These should soon pass.

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About clomethiazole

Tipo de medicamento

Hypnotic and sedative

Usado para

Insomnia, restlessness, or agitation, particularly in elderly people

Alcohol withdrawal symptoms

Disponible como

Capsules and oral liquid medicine

Insomnia, or poor sleep, is fairly common. If you have problems sleeping, it may mean that you have difficulty getting off to sleep, or you may wake up for long periods during the night, or you may wake up too early in the morning. 'Sleeping pills' like clomethiazole are considered a last resort, but are sometimes prescribed for a short period of time to help with a particularly bad spell of insomnia.

Clomethiazole is also prescribed in certain circumstances to help calm elderly people who are particularly restless or agitated. It is also used within specialist dependency units to relieve the symptoms of alcohol withdrawal.

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 clomethiazole it is important that your doctor or pharmacist knows:

  • Si estás embarazada o amamantando.

  • If you have a heart condition, or liver or kidney problems.

  • If you have lung or breathing problems or a problem where you stop breathing for short periods at night (sleep apnoea).

  • If you have ever had a drug addiction or a personality disorder.

  • 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.

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  • Before you start this treatment, read the manufacturer's printed information leaflet from inside your pack. The leaflet will give you more information about clomethiazole and a full list of side-effects which you may experience from taking it.

  • Take clomethiazole exactly as your doctor tells you to. Your dose will be on the label of the pack to remind you:

    • If you have been prescribed clomethiazole for insomnia, your doctor may recommend that you take one or two capsules each evening, or only on certain days of the week. Take the capsules just before you go to bed.

    • If you have been prescribed clomethiazole to help calm restlessness or agitation, your doctor is likely to recommend that you take one capsule three times daily, for a short period of time.

    • If you have been prescribed clomethiazole to help reduce alcohol withdrawal symptoms, your doctor or clinic will tell you how to take it.

  • If you have been prescribed capsules, swallow them whole with a drink of water. Do not chew them.

  • If you have been prescribed the oral liquid medicine it should be diluted with water or juice and swallowed immediately. Measure the correct amount of medicine for your dose and add it to a glass. Mix well with water or juice and ensure you drink the entire contents of the glass. Do not use plastic containers to mix your medicine in.

  • If you forget to take a dose, take it as soon as you remember unless it is nearly time for your next dose, in which case skip the missed dose. Do not take two doses together to make up for a forgotten dose.

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

  • Clomethiazole will make you sleepy. If you still feel sleepy the next day, do not drive and do not use tools or machines.

  • Do not drink alcohol whilst being treated with clomethiazole.

  • Clomethiazole is only recommended for a short period of time. This is because your body can become dependent on it after a while. This can cause problems when you then stop taking it.

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Along with their useful effects, all medicines can cause unwanted side-effects although not everyone experiences them. The table below lists some of the most common ones associated with clomethiazole. You will find a full list in the manufacturer's information leaflet supplied with your medicine. The unwanted effects often improve over the first few days of taking a new medicine, but speak with your doctor or pharmacist if any of the following side-effects continue or become troublesome.

Common clomethiazole side-effects


¿Qué puedo hacer si experimento esto?

Dolor de cabeza

Bebe mucha agua y pide a tu farmacéutico que te recomiende un analgésico adecuado. Si los dolores de cabeza continúan, informa a tu médico

A runny or blocked nose, sore eyes

These can occur soon after taking a dose, but usually quickly pass

Si experimenta otros síntomas que cree que pueden deberse a este medicamento, hable con su médico o farmacéutico.

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

  • Store the capsules in a cool, dry place, away from direct heat and light.

  • If you are using the oral liquid medicine it should be kept in its original container and stored in a refrigerator.

Información importante sobre todos los medicamentos

Si compras algún medicamento, consulta con un farmacéutico que sea seguro tomarlo junto con tus otros 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.

Si vas a someterte a una operación o tratamiento dental, informa a la persona que realiza el tratamiento sobre los medicamentos que estás tomando.

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 Yellow Card website.

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Lecturas adicionales y referencias

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Historial del artículo

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

  • Next review due: 8 May 2027
  • 9 Nov 2022 | Última versión

    Última actualización por

    Michael Stewart, MRPharmS

    Revisado por pares por

    Sid Dajani
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