Effect of uric acid-lowering therapy on blood pressure: systematic review and meta-analysis

Background: The purpose of this meta-analysis was to determine if uric acid-lowering therapy is associated with a decrease in blood pressure (BP) and serum creatinine levels. Materials and methods: Medline, Cochrane, EMBASE, and Google Scholar databases were searched until 29 June 2016, with keywords: uric-acid-lowering therapy, allopurinol, febuxostat, uricosuric, and BP. Only randomized controlled trials were included. The primary outcomes were reduction in systolic BP (SBP) and diastolic BP (DBP), and secondary was reduction in serum creatinine level. Results: Patients treated with allopurinol had greater reduction in SBP (standardized difference in means [SDM]=0.321, 95% confidence interval [CI]: 0.145-0.497, p<0.001), DBP (SDM=0.260, 95% CI: 0.102 to 0.417, p=0.001), and creatinine level (SDM=0.312, 95% CI: 0.008 to 0.615, p=0.044) than control patients. Subgroup analysis showed that allopurinol significantly decreased SBP whether or not antihypertensive drugs were being administered; a decrease in DBP was only seen in patients receiving antihypertensive drugs. Low-dose allopurinol (300mg/day) was more effective at reducing SBP than high-dose (>300mg/day) in patients receiving antihypertensive drugs. Conclusions: These results support that allopurinol decreases BP and creatinine levels in patients with hyperuricemia.