Lorazepam - una benzodiazepina
Revisado por pares por Sid DajaniÚltima actualización por Michael Stewart, MRPharmSÚltima actualización 15 Sept 2022
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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.
De un vistazo
Lorazepam is a medicine that helps to calm the brain.
It is used for anxiety, difficulty sleeping, and before medical procedures.
Take your dose exactly as directed by your doctor.
Do not drink alcohol or grapefruit juice while taking this medicine.
Lorazepam can cause sleepiness, weakness, or light-headedness.
Do not drive or use machines until you know how this medicine affects you.
Lorazepam is usually taken for short periods, not longer than four weeks.
About lorazepam
Tipo de medicamento | A benzodiazepine |
Usado para | Anxiety; insomnia associated with anxiety; as pre-medication before surgery or medical procedures; acute panic attacks; convulsions |
Disponible como | Tabletas, medicina líquida oral e inyección |
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 ansiedad, 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 estás embarazada o amamantando.
If you have any breathing problems.
Si tienes algún problema con el funcionamiento de tu hígado, o si tienes algún problema con el funcionamiento de tus riñones.
If you have a mental health problem. This includes conditions such as psychosis, depression, obsessive conditions, phobias and personality disorders.
If you have ever had a drug or alcohol addiction.
If you have a condition causing severe muscle weakness, called myasthenia gravis.
Si alguna vez has tenido una reacción alérgica a un medicamento.
Si está tomando o usando otros medicamentos. Esto incluye cualquier medicamento que esté tomando y que esté disponible para comprar sin receta, así como medicamentos herbales y complementarios.
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.
If you forget to take a dose at the usual time, take it when you remember. Try to take the correct number of doses each day, but do not take two doses together to make up for a forgotten dose.
Obteniendo el máximo de tu tratamiento
Remember to keep any follow-up appointments with your doctor. This is so your doctor can check on your progress.
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.
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 experimento esto? |
Feeling sleepy, weak, or light-headed (these can continue into the following day) | Do not drive and do not use tools or machines. Do not drink alcohol |
Forgetfulness, feeling confused or unsteady | Si alguno de estos se vuelve problemático, hable con su médico |
Feeling (or being) aggressive | This can happen in some people - let your doctor know about it as soon as possible |
Si experimenta otros síntomas que cree que pueden deberse al medicamento, hable con su médico o farmacéutico para obtener más consejos.
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
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.
Si compras algún medicamento, consulta con un farmacéutico que sea seguro tomarlo junto con tus otros medicamentos.
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.

¿Inseguro sobre mezclar medicamentos?
Verifica posibles interacciones entre medicamentos, suplementos y alimentos antes de tomarlos juntos.
Preguntas frecuentes
How quickly does lorazepam work?
The article states that lorazepam has a calming effect, which is helpful for various conditions like panic attacks and sleep difficulties. It's also used to relax or sedate people during medical procedures. However, the precise onset time of its effects is not detailed.
Is 1 mg of lorazepam a low dose?
The article mentions that the dose of lorazepam will be individualised to suit your needs and that you should take it exactly as your doctor tells you to. It does not specify what constitutes a low, medium, or high dose.
What is lorazepam?
Lorazepam is a type of medicine known as a benzodiazepine. It works by affecting particular substances in the brain, called neurotransmitters, which are responsible for sending messages between brain cells. This action produces a calming effect on various brain functions.
What does lorazepam do?
Lorazepam has a calming effect on the brain. This can help with anxiety, insomnia associated with anxiety, and acute panic attacks. It is also used as a pre-medication to relax or sedate people before surgery or specific medical procedures, and its calming action also helps relax muscles, making it useful in treating convulsions like those caused by epilepsy.
Is lorazepam a benzodiazepine?
Yes, lorazepam is categorised as a benzodiazepine. This is mentioned at the beginning of the article under the 'Type of medicine' section.
Lecturas adicionales y referencias
- Manufacturer's PIL, Lorazepam 1 mg and 2.5 mg Tablets; Genus Pharmaceuticals, The electronic Medicines Compendium. Dated July 2020.
- Medicamentos Completos BNF 89ª Edición; Asociación Médica Británica y Sociedad Real de Farmacia de Gran Bretaña, Londres.
Sobre el autorVer biografía completa

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

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.
Artículo también disponible en Inglés, Alemán, Español, Francés, Italiano, Portugués, Hindi, Hebreo, Árabe, y Sueco.
Próxima revisión: 13 Mar 2027
15 Sept 2022 | Última versión

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