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Lorazepam - una benzodiacepina

Lorazepam has a calming effect. It is prescribed for several different conditions.

Your course of treatment will be as short as possible. This can range from one single dose, to up to a maximum of four weeks of treatment.

Lorazepam is likely to affect your reactions and ability to drive. These effects can last into the following day. It is an offence to drive while your reactions are impaired.

Do not drink alcohol while you are on lorazepam.

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About lorazepam

Tipo de medicamento

Una benzodiacepina

Utilizado para

Anxiety; insomnia associated with anxiety; as pre-medication before surgery or medical procedures; acute panic attacks; convulsions

Disponible como

Comprimidos, medicamentos orales líquidos e inyectables

Lorazepam works by affecting the way certain substances in your brain (called neurotransmitters) pass messages to your brain cells. It has a calming effect on various functions of your brain.

The calming effect is helpful in a variety of conditions which can be caused by anxiety, such as panic attacks and difficulties sleeping. The calming effect is also used to relax and/or sedate people who are having certain medical investigations or treatments. It is given as a pre-med, particularly during procedures that can cause anxiety or discomfort. The calming action also helps to relax muscles, so lorazepam injection is used to treat fits, such as those caused by epilepsy.

Before taking lorazepam

Some medicines are not suitable for people with certain conditions, and sometimes a medicine can only be used if extra care is taken. For these reasons, before you start taking lorazepam it is important that your doctor knows:

  • Si está embarazada o en periodo de lactancia.

  • Si tiene problemas respiratorios.

  • Si tiene algún problema con el funcionamiento de su hígado, o si tiene algún problema con el funcionamiento de sus riñones.

  • Si tiene un problema de salud mental. Esto incluye enfermedades como psicosis, depresión, obsesiones, fobias y trastornos de la personalidad.

  • Si alguna vez has tenido una adicción a las drogas o al alcohol.

  • Si padece una enfermedad que provoca debilidad muscular grave, denominada miastenia grave.

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

  • Si toma o utiliza otros medicamentos. Esto incluye cualquier medicamento que esté tomando y que pueda adquirirse sin receta, así como medicamentos a base de plantas y complementarios.

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How to take lorazepam

  • Before you start the treatment, read the manufacturer's printed information leaflet from inside the pack. It will give you more information about lorazepam, and will also provide you with a full list of the side-effects which you could experience from taking it.

  • Take lorazepam exactly as your doctor tells you to - the dose will be individualised to suit your needs. The directions for taking the tablets will be printed on the label of the pack to remind you about what the doctor said to you. You could be asked to take just one single dose (if it is before a medical procedure, for example), or to take regular doses for a short while. If you are to take lorazepam regularly for anxiety, you will probably be prescribed two or three doses to take a day. If you are taking it because you are having difficulty sleeping, you will be prescribed a dose to take at bedtime only. The course of treatment prescribed will be as short as possible. If you have any questions about how to take the tablets, please ask your doctor or pharmacist for further advice.

  • Try to take your doses of lorazepam at the same times of day each day, as this will help you to remember to take them. Swallow the tablet(s) with a drink of water. You can take lorazepam either with or without food.

  • Si olvida tomar una dosis a la hora habitual, tómela cuando se acuerde. Intente tomar el número correcto de dosis cada día, pero no tome dos dosis juntas para compensar una dosis olvidada.

Aproveche al máximo su tratamiento

  • No olvide acudir a las citas de seguimiento con su médico. Así podrá comprobar su evolución.

  • Lorazepam is likely to affect your reactions and ability to drive. It is an offence to drive while your reactions are impaired. Do not drive until you know how you react, especially when you first start treatment. Please also be aware that the effects of lorazepam can last into the following day. Even if your driving ability is not impaired, should you drive, you are advised to carry with you some evidence that the medicine has been prescribed for you - a repeat prescription form or a patient information leaflet from the pack is generally considered suitable.

  • You should not drink alcohol while you are on lorazepam. It will increase the risk of sedative side-effects.

  • Lorazepam is taken for short periods of time only, often for just a few days. It will not be for longer than four weeks, as this may lead to you feeling dependent on it. Also, your body gets used to it quickly, and after this time it is unlikely to have the same effect.

  • It is possible that drinking grapefruit juice can increase the amount of lorazepam in your bloodstream, which may increase the risk of side-effects. It is probably best to avoid drinking grapefruit juice while you are taking lorazepam.

  • If you are due to have an operation or any dental treatment, please tell the person carrying out the treatment that you are taking lorazepam. This is because lorazepam increases the effects of some anaesthetics.

  • Your doctor could recommend that you reduce your dose of lorazepam gradually when it is time to stop taking it. This is to reduce the risk of you experiencing withdrawal effects. Follow carefully any instructions your doctor gives to you.

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Can lorazepam 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 more common ones associated with lorazepam. The best place to find a full list of the side-effects which can be associated with your medicine, is from the manufacturer's printed information leaflet supplied with the medicine. Alternatively, you can find an example of a manufacturer's information leaflet in the reference section below. Speak with your doctor or pharmacist if any of the following continue or become troublesome.

Common lorazepam side-effects


¿Qué puedo hacer si me ocurre esto?

Sensación de sueño, debilidad o mareo (que puede continuar al día siguiente).

No conduzca ni utilice herramientas o máquinas. No beba alcohol

Olvido, sensación de confusión o inestabilidad

Si alguno de ellos le resulta molesto, hable con su médico

Sentirse (o ser) agresivo

Esto puede ocurrir en algunas personas: informe a su médico lo antes posible.

Si experimenta cualquier otro síntoma que considere que puede deberse al medicamento, consulte a su médico o farmacéutico.

How to store lorazepam

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

No tome nunca más de la dosis prescrita. Si sospecha que usted u otra persona ha tomado una sobredosis de este medicamento, acuda al servicio de urgencias de su hospital. Llévese el envase, aunque esté vacío.

Este medicamento es para usted. Nunca se lo dé a otras personas aunque su enfermedad parezca ser la misma que la suya.

Si compra algún medicamento, compruebe con el farmacéutico que es seguro tomarlo con sus otros medicamentos.

No guarde medicamentos caducados o que no desee. Llévelos a su farmacia local, que se encargará de eliminarlos por usted.

Si tiene cualquier duda sobre este medicamento pregunte a su farmacéutico.

Informar de los efectos secundarios de un medicamento o vacuna

Si experimenta efectos secundarios, puede notificarlos en línea a través del sitio web de la Tarjeta Amarilla.

Lecturas complementarias y referencias

Historia del artículo

La información de esta página ha sido redactada y revisada por médicos cualificados.

  • Fecha prevista para la próxima revisión: 13 mar 2027
  • 15 Sept 2022 | Última versión

    Última actualización

    Michael Stewart, MRPharmS

    Revisado por expertos

    Sid Dajani
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