Decoding the Safety Profile of GLP-1 Receptor Agonists: Facts, Myths, and Ongoing Controversies

Glucagon-like peptide-1 receptor agonists (GLP-1RAs) represent one of the most significant therapeutic advances in the management of type 2 diabetes and obesity. As their indications have expanded to include cardiovascular and kidney disease, safety concerns involving multiple organ systems have received increasing attention. This narrative review examines the spectrum of adverse effects linked to GLP-1RAs and provides a clinically relevant platform for assessing their safe prescription.

Gastrointestinal intolerance, modest increases in heart rate, and a modest but reproducible increase in the risk of gallbladder and biliary disease represent the most consistently supported adverse effects of GLP-1RAs. A risk of pancreatitis is also considered to exist, although some studies have challenged this association. Conversely, correlations with neuropsychiatric and dermatological disorders, diabetic retinopathy, nonarteritic anterior ischemic optic neuropathy, perioperative aspiration, sexual and reproductive disturbances, sarcopenia, and malignancy remain controversial. Most available evidence derives from pharmacovigilance databases, retrospective observational studies, and secondary analyses of randomized trials, which are limited by reporting bias, residual confounding, and inability to establish causality. Heterogeneity in study design, statistical methodology, outcome definitions, and patient populations further complicates interpretation. Although several proposed adverse effects have biologically plausible mechanisms, prospective clinical validation remains limited. Notably, recent regulatory decisions, including the Food and Drug Administration (FDA)'s removal of the suicidality warning from GLP-1RA prescribing information, reflect the evolving nature of these safety assessments. The overall benefit-risk profile of GLP-1RAs is favorable. Most emerging safety concerns should currently be regarded as hypothesis-generating signals rather than established toxicities. Individualized risk assessment and appropriate clinical monitoring remain important as ongoing and future prospective studies further define the long-term safety of this rapidly expanding therapeutic class.