Allopurinol may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:
* upset stomach
* diarrhea
* drowsiness
Some side effects can be serious. The following symptoms are uncommon, but if you experience any of them, call your doctor immediately:
* skin rash
* painful urination
* blood in the urine
* irritation of the eyes
* swelling of the lips or mouth
* fever, sore throat, chills, and other signs of infection
* loss of appetite
* unexpected weight loss
* itching
Keep all appointments with your doctor and the laboratory. Your doctor will order certain lab tests to check your body’s response to allopurinol.
Do not let anyone else take your medicines.
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