Allopurinol, one of the most commonly used
uric acid-lowering agents, can cause serious adverse events. To investigate the risk factors for
allopurinol-induced adverse events, the authors enrolled 94 patients who developed
allopurinol-induced adverse events and 378 controls who were randomly chosen from 1934 patients who used
allopurinol but did not develop any adverse events in this retrospective case control study. Univariate analysis showed that patients who developed
allopurinol-induced adverse events had more
chronic kidney disease (46% vs 30%, P = .005), more
hypertension (42% vs 30%, P = .036), less
tumor lysis syndrome (P = .030), higher
cholesterol (P = .013), and lower
aspartate aminotransferase (P = .002) and
alanine aminotransferase levels (P = .033) and more commonly used
angiotensin receptor blockers (27% vs 15%, P = .007), colchicines (16% vs 5%, P = .010), or
statins (19% vs 8%, P = .002) than those who did not. In multiple logistic regression analysis, the use of colchicines (odds ratio, 3.11; 95% confidence interval, 1.28-7.58; P = .012) and
statins (2.10; 1.03-4.25; P = .041) was an independent risk factor predicting adverse events in
allopurinol users. In conclusion, patients who use
colchicine or
statins are at significant risk for developing
allopurinol-induced adverse events.