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The risk of having a rash when taking allopurinol depends on the dose of allopurinol. I would recommend consulting your doctor about discontinuing the drug completely for a week. After a week you can reintroduce allopurinol with a dose of 100 mg/day. Take this minimum dose for a week and if there is no rash then increase to 200 mg/day. Then take the 200 mg/day dose for around 2 weeks and if there is no rash then you can again increase to a maximum dose of 300 mg/day. If you get a rash with 300 mg/day then you can reduce the dose back to 200 mg/day. But if there is no rash then you can continue with 300 mg/day.
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