If you experience any of the following serious side effects, stop taking Zyloprim and seek emergency medical attention: an allergic reaction (difficulty breathing; closing of your throat; swelling of your lips, tongue, or face; or hives); blood in your urine or pain when you urinate; a rash; eye irritation; fever, chills, or joint aches; or severe nausea or vomiting. Other, less serious side effects may be more likely to occur. Continue to take Zyloprim and talk to your doctor if you experience upset stomach or diarrhea; headache, dizziness, or drowsiness; or an acute attack of gouty arthritis. Side effects other than those listed here may also occur. Talk to your doctor about any reaction that seems unusual or that is especially bothersome.
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