Posso tomar Levotiroxina e Losartana juntos?
Guia de interação medicamentosa
Publicado originalmente 25 Jan 2026
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There is no known direct interaction between levothyroxine and losartan. Both medications can be taken together safely.
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Por que isso acontece
Levothyroxine is a synthetic thyroid hormone, and losartan is an angiotensin II receptor blocker (ARB) used for blood pressure. They work through entirely different pathways in the body and do not interfere with how the other is absorbed, broken down, or excreted.
O que você deve fazer
Voltar ao conteúdoYou can continue taking both medications as prescribed. It is generally recommended to take levothyroxine on an empty stomach, at least 30 to 60 minutes before breakfast, to ensure it is absorbed properly. Losartan can be taken with or without food at any time of day, as long as you are consistent.
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Precauções importantes
Voltar ao conteúdoGravidez
You must not take losartan if you are pregnant or planning to become pregnant. It can cause serious harm or death to an unborn baby, particularly if used during the second and third trimesters.
Heart conditions (e.g. angina, heart failure)
If you have a heart condition, your dose must be started very low and increased slowly. Contact your doctor immediately if you experience chest pain or palpitations, as levothyroxine increases the workload on your heart.
Interaction with supplements (Calcium/Iron)
Do not take calcium tablets, iron supplements, or multivitamins at the same time as levothyroxine. You must leave a gap of at least 4 hours between these supplements and your levothyroxine to ensure the medicine works.
Diabetes
Levothyroxine can raise blood sugar levels. If you have diabetes, you must monitor your blood glucose more closely when starting or changing your dose, as your diabetes medication may need to be increased.
Avisos sobre alimentos e bebidas
Voltar ao conteúdoÁlcool
It is best to avoid or strictly limit alcohol while taking losartan. Both alcohol and losartan lower your blood pressure; combining them can make you feel very dizzy, lightheaded, or faint, especially when standing up.
It is best to avoid or strictly limit alcohol while taking levothyroxine. While there is no direct chemical reaction, alcohol can affect thyroid function and may worsen symptoms like tiredness or mood changes.
Timing of dose and food/drink
Take your levothyroxine on an empty stomach, at least 30 to 60 minutes before breakfast or any caffeine. Food, milk, and coffee prevent the medicine from being absorbed properly.
Cafeína (Café/Chá)
Caffeine can significantly reduce the amount of levothyroxine your body absorbs. You should wait at least 30 to 60 minutes after taking your tablet before drinking coffee or tea.
Produtos lácteos (Leite, Iogurte, Queijo)
Avoid consuming dairy products at the same time as your levothyroxine. Calcium found in dairy can interfere with how your body absorbs the medicine, making it less effective. It is best to wait at least 4 hours between taking levothyroxine and consuming dairy.
Produtos de soja
Soya can interfere with the absorption of levothyroxine. If you regularly eat or drink soya products, your doctor may need to monitor your thyroid levels more closely. Avoid consuming soya at the same time as your dose.
Kelp and Seaweed
These foods are naturally high in iodine. Too much iodine can interfere with your thyroid treatment and make your condition worse.
Alimentos ricos em fibras
A diet very high in fibre can reduce the absorption of levothyroxine. If you significantly change your fibre intake, inform your doctor as your dose may need adjusting.
Potassium-rich foods (e.g., Bananas, Spinach) and Salt Substitutes
Losartan can increase the levels of potassium in your blood. You should avoid using salt substitutes (like Lo-Salt) that contain potassium and speak to your doctor before making large changes to your diet regarding potassium-rich foods.
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Usando outros medicamentos
Voltar ao conteúdoTomando 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.
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Drug interactions checker
Can I take Losartan and Magnesium together?
Taking magnesium supplements alongside losartan can lead to an increased risk of low blood pressure (hypotension). Additionally, certain types of magnesium supplements or high doses may affect how much potassium stays in your body.

Drug interactions checker
Can I take Magnesium and Bisoprolol together?
Taking magnesium and bisoprolol together can lead to an excessively slow heart rate or a significant drop in blood pressure. This may cause you to feel dizzy, lightheaded, or faint.
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Histórico do artigo
As informações nesta página são escritas e revisadas por clínicos qualificados.
25 Jan 2026 | Publicado originalmente

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