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Can I take Spironolactone and Potassium together?

Guia de interação medicamentosa

Taking spironolactone and potassium supplements together can lead to dangerously high levels of potassium in your blood (a condition called hyperkalaemia). While your body needs potassium for your heart and muscles to work, too much of it can cause serious heart rhythm problems or even cause the heart to stop beating. Symptoms of high potassium can include muscle weakness, tingling sensations, or palpitations, but often there are no symptoms until the level is very high.

Por que isso acontece

Spironolactone is a 'potassium-sparing diuretic' (water tablet). Unlike most water tablets that make you lose potassium in your urine, spironolactone tells your kidneys to hold onto potassium while getting rid of extra salt and water. If you take extra potassium supplements at the same time, the potassium builds up in your body because the kidneys are being blocked from flushing the excess away.

You should only take potassium supplements with spironolactone if your doctor has specifically told you to do so and is monitoring your blood levels closely. Avoid using 'salt substitutes' (like Lo-Salt) which are made of potassium chloride. You should also be careful with eating very large amounts of potassium-rich foods like bananas or spinach. Your doctor will likely perform regular blood tests to check your potassium levels and kidney function. Seek medical help immediately if you feel an irregular heartbeat or extreme muscle weakness.

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Hyperkalaemia (High Potassium)

Taking these medicines together significantly increases the risk of dangerously high potassium levels in your blood. This can cause life-threatening heart rhythm problems. You must have regular blood tests to monitor your potassium and kidney function.

Gravidez

Spironolactone should not be used in pregnancy as it has an anti-androgen effect that can interfere with the normal development of a male foetus.

Salt Substitutes

Avoid using 'Lo-Salt' or other potassium-based salt substitutes. These contain high levels of potassium which, when combined with these medicines, can lead to a toxic build-up of potassium in your body.

High-potassium foods (e.g. bananas, oranges, spinach, avocados)

Spironolactone is a 'potassium-sparing' diuretic, meaning it helps your body hold onto potassium. Taking it alongside potassium supplements or a diet very high in potassium can cause your blood potassium levels to become dangerously high (hyperkalaemia). You should avoid consuming excessive amounts of these foods and only take potassium supplements if specifically directed by your doctor while on spironolactone.

Salt substitutes (e.g. Lo-Salt)

Many salt substitutes use potassium chloride instead of sodium. Using these while taking spironolactone or potassium supplements can lead to a rapid and dangerous rise in blood potassium levels. You should avoid these products entirely.

Álcool

Spironolactone lowers your blood pressure. Drinking alcohol can increase this effect, making you feel dizzy, lightheaded, or faint, especially when standing up. It is best to keep alcohol intake to a minimum until you know how the medicine affects you.

Alimentação (Geral)

Spironolactone should ideally be taken with food. This helps your body absorb the medicine better and can reduce the chance of feeling sick (nausea).

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Tomando vários medicamentos? Nosso Verificador de Interações de Medicamentos ajuda você a verificar se suas prescrições, medicamentos de venda livre e suplementos são seguros para serem tomados juntos. Basta procurar seus medicamentos para ver possíveis interações e o que fazer sobre elas.

Aviso Legal

Esta informação é apenas para fins educacionais gerais e não deve ser considerada como um substituto para aconselhamento médico profissional. Sempre consulte seu médico, farmacêutico ou outro profissional de saúde qualificado antes de tomar decisões sobre seus medicamentos. As circunstâncias individuais podem variar, e somente um profissional de saúde que conheça seu histórico médico pode fornecer orientações personalizadas.

Histórico do artigo

As informações nesta página são escritas e revisadas por clínicos qualificados.

  • 25 Jan 2026 | Publicado originalmente
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