What are the possible side effects of furosemide

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Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Stop using furosemide and call your doctor at once if you have a serious side effect such as:

  • ringing in your ears, hearing loss;
  • feeling very thirsty or hot, being unable to urinate, heavy sweating, or hot and dry skin;
  • painful or difficult urination;
  • pale skin, unusual bleeding (nose, mouth, vagina, or rectum), purple or red pinpoint spots under your skin;
  • feeling light-headed or short of breath, rapid heart rate, trouble concentrating;
  • nausea, upper stomach pain, itching, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes);
  • sudden numbness or weakness, especially on one side of the body;
  • skin rash, bruising, severe tingling, pain, muscle weakness;
  • dry mouth, increased thirst, drowsiness, restless feeling, confusion, nausea, vomiting, increased urination, muscle pain or weakness, uneven heart rate, fainting, orseizure (convulsions);
  • numbness or tingly feeling around your mouth, muscle tightness or contraction, overactive reflexes;
  • headache, trouble concentrating, weakness, loss of appetite, feeling unsteady, shallow breathing or breathing that stops; or
  • severe skin reaction -- fever, sore throat, swelling in your face or tongue, burning in your eyes, skin pain, followed by a red or purple skin rash that spreads (especially in the face or upper body) and causes blistering and peeling.

Less serious side effects may include:

  • diarrhea, constipation, stomach pain;
  • dizziness, spinning sensation;
  • blurred vision; or
  • mild itching or rash.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

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