A retrospective cohort study found that individuals age 65 and older taking the gout drug allopurinol had a 17 percent decrease in the risk of atrial fibrillation, the most common heart arrhythmia, and the risk was reduced by 35 percent among those who had taken the drug for more than two years. The reduction in risk was most pronounced for people age 85 and older, women, and Caucasians.

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