OBJECTIVE: To estimate the effect of initiating glucagon-like peptide 1 receptor agonists (GLP-1 RAs) versus dipeptidyl peptidase 4 (DPP-4) inhibitors on incident nonarteritic anterior ischemic optic neuropathy (NAION) among adults with type 2 diabetes.
RESEARCH DESIGN AND METHODS: This active-comparator, new-user cohort emulated a pragmatic target trial using the U.K. Clinical Practice Research Datalink. Patients aged ≥18 years with a physician diagnosis of type 2 diabetes who newly initiated a GLP-1 RA or a DPP-4 inhibitor were included. DPP-4 inhibitors were selected as the comparator because they may be used as second-line treatment, like GLP-1 RAs, and have no established association with NAION. We estimated risks, risk differences (RDs), and risk ratios (RRs) of incident NAION, adjusted using propensity-score fine-stratification weighting.
RESULTS: At 1 year, there were 14 NAION events among 106,858 GLP-1 RA initiators (18.5 per 100,000) and 53 among 416,369 DPP-4 inhibitor initiators (7.2 per 100,000). GLP-1 RAs were associated with an increased risk of NAION compared with DPP-4 inhibitors (RR 2.56; 95% CI 1.44-4.86; RD 11.3 per 100,000). The risk of NAION was higher during the first 6 months of use, diminishing with longer duration of use, and was higher in patients aged <50 years, men, ever-smokers, and those with ≥1% hemoglobin A1c reduction.
CONCLUSIONS: GLP-1 RAs were associated with an increased 1-year risk of NAION compared with DPP-4 inhibitors among adults with type 2 diabetes, particularly in younger patients, men, ever-smokers, and patients with a marked hemoglobin A1c reduction.
GLP-1 Therapies