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Furosemida

Furosemide is a 'water tablet' (a diuretic).

Es preferible tomarlo por la mañana.

Any side-effects are usually mild, but can include feeling sick (nausea) or dizzy.

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About furosemide

Tipo de medicamento

A loop diuretic

Utilizado para

Water retention (oedema); high blood pressure (hypertension)

También llamado

Frusol®;
Combination brand: Frumil® (furosemide with amiloride - this combination is also called co-amilofruse)

Disponible como

Comprimidos y medicamentos orales líquidos

Furosemide belongs to a group of medicines called loop diuretics. A diuretic is a medicine which increases the amount of urine that you pass out from your kidneys. They are often referred to as 'water tablets'. Furosemide is used to clear excess fluid from your body in conditions where your body retains more than it needs. This extra fluid causes you to feel breathless and tired, and your feet and ankles to swell - it is called water retention (oedema), and it is commonly caused by heart failure.

Diuretics are also a common treatment for high blood pressure (hypertension). Furosemide is prescribed for high blood pressure when it cannot be sufficiently controlled by other diuretics. Furosemide can be used on its own as a diuretic, or it can be prescribed as a combination tablet alongside other diuretics such as triamterene, amiloride or spironolactone.

Before taking furosemide

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 furosemide it is important that your doctor knows:

  • Si está embarazada o en periodo de lactancia.

  • If you have any difficulties passing urine, or if you have prostate problems.

  • If you have gout or diabetes (diabetes mellitus). These conditions can be made worse by diuretics.

  • If you have been told you have very low sodium or potassium levels in your blood.

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

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

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How to take furosemide

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

  • Take furosemide exactly as your doctor tells you to. It is usual to be prescribed one dose to take each day, and you will be asked to take it preferably in the morning. Some people could be asked to take two doses a day, in which case one dose should be taken in the morning and the other early-mid afternoon. Your doctor will tell you how many tablets (or how much liquid medicine) to take for each dose. You will find the directions for taking the doses printed on the label of the pack, to remind you about what the doctor said to you.

  • Although furosemide is preferably taken in the morning, you can take it at a time to suit your schedule. For example, if you want to go out in the morning and don't want to have to find a toilet, you can delay taking your dose until later. However, it is best if you take it no later than mid-afternoon. This is because you will find you need to go to the toilet a couple of times within a few hours of taking it and this will disturb your sleep if you take it too late in the day.

  • Swallow the tablet with a drink of water. You can take furosemide either with or without food.

  • If you forget to take a dose, take it as soon as you remember. However, if it is after 4 pm in the afternoon, you should leave out the forgotten dose and continue as usual the next day. Do not take two doses together to make up for a missed dose.

Aproveche al máximo su tratamiento

  • Try to keep your regular appointments with your doctor. This is so your doctor can check on your progress. The balance of salts in your blood may be upset by furosemide. Your doctor may want you to have a blood test from time to time to check for this.

  • Diuretics like furosemide help you to lose water. Occasionally you may lose too much and become lacking in fluid in the body (dehydrated). Let your doctor know if you feel constantly thirsty and tired, your mouth is dry, you have muscle cramps, or your skin looks and feels dry.

  • If you have been prescribed furosemide for high blood pressure, your treatment is likely to be long-term. Although many people with high blood pressure do not feel unwell, if left untreated, high blood pressure can harm your heart and damage your blood vessels. This damage may later result in a heart attack, stroke, or kidney problems, so it is important that you continue to take furosemide regularly to help reduce the risk of this. You may also be given some lifestyle or dietary advice by your doctor, such as stopping smoking, reducing the amount of salt in your diet and taking some regular exercise. Following this advice will also help to reduce the risk of damage to your heart and blood vessels.

  • Drinking alcohol while you are on furosemide could make you feel dizzy. Ask for your doctor's advice about whether you should avoid alcohol.

  • Si compra algún medicamento "sin receta", compruebe con un farmacéutico que es seguro tomarlo con los medicamentos que le han recetado.

  • If you have diabetes, furosemide could affect your blood sugar levels. Test your blood sugar regularly and speak with your doctor if you notice any significant changes.

  • Si va a someterse a una operación o a un tratamiento dental, comunique a la persona que vaya a realizar el tratamiento qué medicamentos está tomando.

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Can furosemide 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 furosemide. 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.

Furosemide side-effects

¿Qué puedo hacer si me ocurre esto?

Sensación de malestar (náuseas), malestar estomacal

This is usually mild, but it may help to take furosemide after food

Sensación de mareo, sobre todo al ponerse de pie (debido a una tensión arterial baja).

Getting up and moving more slowly should help. Do not drive and do not use tools or machines while affected

Boca seca

Prueba a mascar chicle sin azúcar o chupar caramelos sin azúcar

Blurred vision, headache, feeling tired

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

Changes to the levels of minerals in your body

Your doctor will ask you to have blood tests to check for this

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

How to store furosemide

  • Mantenga todos los medicamentos fuera del alcance y de 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

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.

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: 23 feb 2026
  • 24 Feb 2023 | Última versión

    Última actualización

    Michael Stewart, MRPharmS

    Revisado por expertos

    Sid Dajani
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