JOURNAL ARTICLE
META-ANALYSIS
REVIEW
SYSTEMATIC REVIEW
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Efficacy and safety of empagliflozin as add-on to metformin for type 2 diabetes: a systematic review and meta-analysis.

PURPOSE: To assess the efficacy and safety of empagliflozin (EMPA) as add-on to metformin (MET) in patients with type 2 diabetes mellitus (T2DM).

METHODS: We searched PubMed, Embase, Medline, OVID, Cochrane Library and Web of Science. Randomized controlled trials of EMPA as add-on to MET for T2DM were included. Two investigators independently selected studies, extracted data and assessed the risk of bias. A meta-analysis was conducted by using RevMan 5.3 software and Stata 12 software.

RESULTS: Seven trials including 4256 patients were analysed. Compared with placebo, two different doses of EMPA significantly reduced glycated haemoglobin (HbA1c) [10 mg: weighted mean difference (WMD) -0.57 %; 95 % confidence interval (CI) -0.65 to -0.49 %, P < 0.00001; 25 mg: WMD -0.65 %; 95 % CI -0.72 to -0.57 %, P < 0.00001]. Compared with active comparators (two sitagliptin, one linagliptin and one glimepiride), 10 mg of EMPA provided a similar reduction in HbA1c [WMD -0.10 %; 95 % CI -0.23 to 0.03 %, P = 0.13], while 25 mg of EMPA provided a significantly greater reduction in HbA1c [WMD -0.13 %; 95 % CI -0.20 to -0.06 %, P = 0.0005]. In addition, EMPA as add-on to MET also had a favourable effect on body weight and blood pressure. The risk of hypoglycaemia in the EMPA group was similar to the placebo group or active comparator group.

CONCLUSIONS: EMPA as add-on to MET was well tolerated and provided additional benefits beyond glucose lowering, such as weight loss and blood pressure reduction. However, high-quality trials with large samples are still needed in order to confirm their long-term safety.

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