Use of SGLT2 Inhibitors Versus DPP-4 Inhibitors and Age-Related Macular Degeneration in Patients WithType 2 Diabetes: A Multinational Cohort Study.

Purpose: To compare the impact of sodium-glucose cotransporter 2 (SGLT2) and dipeptidyl peptidase 4 (DPP-4) inhibitors on age-related macular degeneration (AMD) risk among patients with type 2 diabetes mellitus (T2DM).

Methods: This multinational, retrospective cohort study used electronic medical records from healthcare institutions across 21 countries. Adults 50 years or older with T2DM who had a prior prescription of metformin and initiated SGLT2 or DPP-4 inhibitors from 2013 to 2023 were included. The SGLT2 and DPP-4 inhibitor groups were propensity score matched in a 1:1 ratio to balance baseline characteristics and were followed for up to 5 years to observe the occurrence of AMD. Statistical analysis was performed using the Cox proportional hazards model and Kaplan-Meier analysis.

Results: Our final analysis included 20,966 T2DM patients prescribed SGLT2 inhibitors and 20,966 prescribed DPP-4 inhibitors. Compared to the DPP-4 inhibitor group, the SGLT2 inhibitor group was associated with significantly lower risks of AMD (hazard ratio [HR], 0.71; 95% confidence interval [CI], 0.58-0.85) and dry AMD (HR, 0.61; 95% CI, 0.46-0.80) but not wet AMD (HR, 0.74; 95% CI, 0.48-1.16). SGLT2 inhibitors compared with DPP-4 inhibitors were linked to a reduced risk of AMD in the White population, patients prescribed empagliflozin or dapagliflozin, and individuals with glycated hemoglobin < 8.5%, estimated glomerular filtration rate ≥ 60 mL/min/1.73 m2, hypertension, or dyslipidemia, regardless of body mass index level.

Conclusions: In patients with T2DM, those prescribed SGLT2 inhibitors may experience lower risks of AMD and dry AMD compared to those prescribed DPP-4 inhibitors.