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Spironolactone

Aldactone

Spironolactone is a diuretic, also known as a 'water tablet'.

It will make you go to the toilet more often to pass urine.

The most common side-effect is a mild stomach upset. This is not usually troublesome.

At a glance

  • Spironolactone is a medicine that helps your body get rid of excess fluid.

  • It is used to treat fluid retention caused by various conditions like heart or kidney problems.

  • Take your tablets with or just after a meal.

  • Take spironolactone no later than mid-afternoon to avoid disturbed sleep.

  • Your doctor will arrange blood tests to check the salt balance in your blood.

  • Avoid high potassium foods and salt substitutes while taking spironolactone.

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About spironolactone

Tipo de medicamento

Aldosterone antagonist diuretic, potassium-sparing diuretic

Usado para

Retención de líquidos
Insuficiencia cardíaca
Primary hyperaldosteronism

También llamado

Aldactone®;
Combination brands: Lasilactone® (spironolactone with furosemida); Aldactide® (spironolactone with hydroflumethiazide - co-flumactone)

Disponible como

Comprimidos

Spironolactone is used to treat fluid retention (oedema) caused by liver disease, kidney problems or insuficiencia cardíaca. Oedema occurs when fluid leaks out of your blood vessels, causing swelling in the tissues of your lungs, feet or ankles. This makes you feel breathless or your legs feel puffy. Spironolactone prevents a build-up of fluid in your body by increasing the amount of urine your kidneys produce. It is also used to treat some other conditions which cause fluid retention, such as a disorder called primary hyperaldosteronism.

Spironolactone is known as a potassium-sparing diuretic. Unlike some other diuretics, it does not cause your body to lose potassium. Diuretics are sometimes referred to as 'water tablets'.

Spironolactone is often used alongside other diuretics. When it is used like this, it may be prescribed as a combination product, such as in Lasilactone® (spironolactone with furosemida) and Aldactide® (spironolactone with hydroflumethiazide). Combinations like these help to reduce the number of tablets you need to take each day.

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 spironolactone it is important that your doctor or pharmacist knows:

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

  • If you have kidney problems.

  • If you are being treated for prostate cancer.

  • If you have a problem with your adrenal glands, called Enfermedad de Addison.

  • If you have a rare inherited blood disorder, called porphyria.

  • 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 spironolactone and a full list of side-effects which you may experience from taking it.

  • Take spironolactone exactly as your doctor has told you. The usual dose varies from 25 mg to 200 mg. Depending upon which dose is right for you, you may be asked to take several tablets a day but these are generally taken at the same time.

  • Take the tablets with or just after a meal.

  • Spironolactone is commonly prescribed just once daily and you can generally take the dose at a time to suit you. However, diuretics are best taken no later than mid-afternoon. This is because you will find you may need to go to the toilet a couple of times after taking them and this could disturb your sleep if you take it late in the day.

  • If you have been prescribed more than one tablet of spironolactone a day and told to take them at different times, make sure you take your last tablet no later than 6 pm.

  • If you forget to take a dose, take it as soon as you remember. However, if it is after 6 pm in the evening, skip the missed dose and continue as usual the next day. Do not take two doses at the same time to make up for a missed dose.

  • Try to keep your regular appointments with your doctor. This is so your doctor can check on your progress. The salt balance in your bloodstream may be upset by diuretics and your doctor will want you to have a blood test from time to time to check for this.

  • Diuretics help you to lose water, so you can breathe or move more easily. If, however, you lose too much fluid, you may become dehydrated. This will make you feel thirsty and make your skin look and feel dry. Let your doctor know if this happens, as your dose may need to be adjusted.

  • Another sign of dehydration with spironolactone is rapid weight loss after starting the tablets. Speak with your doctor if you notice this happening.

  • Because spironolactone is a potassium-conserving diuretic, you should try to avoid things with a high potassium content, such as 'salt substitutes' or low-sodium salt. This is so the level of potassium in your body does not become too high.

  • Treatment with diuretics is usually long-term, so continue to take these tablets unless you are advised otherwise by your doctor.

  • Si compras algún medicamento, consulta con un farmacéutico que sean adecuados para tomar con tus otros medicamentos.

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

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Junto con sus efectos útiles, la mayoría de los medicamentos pueden causar efectos secundarios no deseados, aunque no todos los experimentan. Estos generalmente mejoran a medida que su cuerpo se adapta al nuevo medicamento, pero hable con su médico o farmacéutico si alguno de los siguientes efectos secundarios persiste o se vuelve problemático.

Spironolactone side-effects


¿Qué puedo hacer si experimento esto?

Sentirse mal (náuseas) o estar enfermo (vómitos)

Mantente con comidas simples - evita alimentos ricos o picantes

Feeling tired, dizzy, or sleepy

Si esto ocurre, no conduzca y no use herramientas o máquinas hasta que se sienta mejor

Sexual problems, breast discomfort and enlargement, feeling confused, irregular periods, confusion, sweating, cramps, hair loss or unwanted hair growth, and skin rash

Si alguno de estos se vuelve problemático, hable con su médico

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.

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

Información importante sobre todos los medicamentos

Never take more than the prescribed dose. If you suspect that you or someone else has taken an overdose of this medicine, go to the accident and emergency department of your local hospital at once. Take the container with you, even if it is empty.

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.

verificador de síntomas

¿Inseguro sobre mezclar medicamentos?

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

Preguntas frecuentes

What is the primary function of spironolactone for people with fluid retention?

Spironolactone helps to prevent fluid build-up in your body by increasing the amount of urine your kidneys produce. This reduces swelling in areas like your lungs, feet, or ankles, which can make you feel breathless or puffy.

How does spironolactone differ from other 'water tablets'?

Spironolactone is known as a 'potassium-sparing diuretic'. This means that, unlike some other diuretics (water tablets), it does not cause your body to lose potassium. This is important as some diuretics can lead to a loss of potassium, which might need to be replaced.

When is the best time of day to take spironolactone to avoid disrupting my sleep?

You can generally take spironolactone at a time that suits you, but it's best to take it no later than mid-afternoon. If you need to take more than one tablet a day at different times, make sure your last tablet is taken no later than 6 pm. This is because diuretics increase urination, and taking them late in the day could disturb your sleep.

What should I do if I accidentally miss a dose of spironolactone?

If you forget to take a dose, take it as soon as you remember. However, if it's already after 6 pm, you should skip the missed dose and continue with your usual schedule the next day. Do not take two doses at the same time to make up for a missed dose.

What are the signs of dehydration linked to spironolactone, and what should I do?

Signs of dehydration can include feeling thirsty, having dry-looking skin, or experiencing rapid weight loss after you start taking the tablets. If you experience any of these symptoms, you should let your doctor know, as your dose might need to be adjusted.

Why should I be careful about my potassium intake while taking spironolactone?

Because spironolactone helps your body hold onto potassium, you should try to avoid foods or products with a high potassium content, such as 'salt substitutes' or low-sodium salt. This precaution helps prevent the level of potassium in your body from becoming too high.

Are there any common side effects of spironolactone that I should be aware of?

Some common side effects can include feeling sick or being sick, and feeling tired, dizzy, or sleepy. If you experience these, sticking to simple meals, avoiding rich or spicy foods, and being cautious about driving or using machines until you feel better can help. Other possible side effects include sexual problems, breast discomfort, confusion, sweating, cramps, hair loss, or skin rash. If any side effects become troublesome or continue, speak with your doctor or pharmacist.

Lecturas adicionales y referencias

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About the authorView full bio

Author image

Michael Stewart, MRPharmS

Medicine Leaflet Review Manager – Contractor, Pharmacist

BPharm (Hons), MRPharmS

Michael is a community pharmacist practicing in the Midlands and South Yorkshire with more than 20 years’ experience advising on medicines and medical conditions. He has a strong background in healthcare training, having produced and delivered training courses for pharmacy teams and staff of residential care settings, including nurses. He has also contributed to pharmacy advisory boards for the management of low acuity conditions in the community.

About the reviewer

Author image

Sid Dajani

Sultan Dajani qualified at the London School of Pharmacy in 1994 and became the youngest elected member of the Royal Pharmaceutical Society council since its founding in 1842.

Historial del artículo

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

  • Próxima revisión: 27 feb 2027
  • 30 Ago 2022 | Última versión

    Última actualización por

    Michael Stewart, MRPharmS

    Revisado por pares por

    Sid Dajani
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