When should I call my doctor if I am taking furosemide?

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When you are taking furosemide (Lasix), call your doctor if you have any side effects or symptoms, especially effects that are severe, that bother you or that don’t go away. Furosemide is a strong diuretic or water pill used to treat fluid retention (edema) in people with heart failure, as well as certain cases of high blood pressure.

Common side effects of furosemide include thirst, upset stomach, vomiting, blurred vision, headache, muscle cramps, weakness, restlessness, constipation, dizziness and confusion. There are other, more serious side effects. Call your doctor immediately if you have any of these symptoms: unusual bleeding or bruising, ringing in your ears, loss of hearing, fever, sore throat, severe rash with peeling skin, difficulty breathing or swallowing, or rapid and excessive weight loss.