Potential Side Effects
During treatment with allopurinol, patients could experience side effects. Drowsiness, skin rashes, headaches, nausea, vomiting, and diarrhea are some of the most frequently reported side effects of this medication. Patients may notice an upset stomach or a change in their sense of taste. The medicine may cause liver function tests to be abnormal. Individuals who use this medication should let their doctor know if they experience severe or persistent diarrhea, drowsiness, or upset stomach. They should also contact their doctor if they develop a skin rash, including a mild one.
Less commonly, patients may develop numbness and tingling sensations. Urinary problems may also occur in rare cases. For example, patients could have painful urination or decreased or absent urinary output. They may also see blood in their urine. Liver problems may develop during treatment. Patients should watch for unintentional weight loss, stomach pain, itching, fever, chills, and loss of appetite. They must report these symptoms should be reported to their doctor immediately. Patients should seek urgent medical attention for urinary side effects as well.