Allopurinol

What is Allopurinol?

Allopurinol reduces the production of uric acid in your body. Uric acid buildup can lead to gout or kidney stones. Allopurinol is used to treat gout or kidney stones, and to decrease levels of uric acid in people who are receiving cancer treatment.

Allopurinol side effects

Get emergency medical help if you have any of these signs of an allergic reaction to allopurinol: hives; difficult breathing; swelling of your face, lips, tongue, or throat. Stop using allopurinol and call your doctor at once if you have a serious side effect such as:

  • fever, sore throat, and headache with a severe blistering, peeling, and red skin rash;
  • the first sign of any skin rash, no matter how mild;
  • pain or bleeding when you urinate;
  • nausea, upper stomach pain, itching, loss of appetite, weight loss, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes);
  • urinating less than usual or not at all;
  • joint pain, flu symptoms;
  • severe tingling, numbness, pain, muscle weakness; or
  • easy bruising, unusual bleeding (nose, mouth, vagina, or rectum), purple or red pinpoint spots under your skin.

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