How Semaglutide Shortages Disrupted Diabetes Prescriptions in Australia

When semaglutide supply shortages hit Australia in 2022, prescriptions dropped 17% while dulaglutide prescriptions surged 53% as doctors switched patients to the available alternative. The shortages resulted in approximately 119,069 fewer semaglutide prescriptions than predicted over a 4-month period. When dulaglutide also experienced shortages shortly after, its prescriptions dropped 17% as well, leaving type 2 diabetes patients with limited GLP-1 agonist options.

Researchers performed a retrospective analysis of Australian Pharmaceutical Benefits Scheme (PBS) prescription data for 2021-2022. They used Holt-Winters statistical modeling to predict expected prescription volumes and compared these predictions against actual prescriptions supplied, identifying the gap caused by supply shortages.

The GLP-1 agonist shortage affected millions of diabetes patients worldwide, and this Australian data quantifies the real-world impact. When one drug becomes unavailable, the surge in demand for alternatives can trigger cascading shortages. This pattern highlights the vulnerability of diabetes care when it depends on a small number of peptide drugs from limited manufacturing sources.

GLP-1 agonist shortages have become a global health issue as demand for these drugs — driven partly by their use for weight loss — outstrips manufacturing capacity. This study provides concrete prescription data showing how shortages cascade between related drugs. As more GLP-1 drugs enter the market (tirzepatide, survodutide, etc.), manufacturing diversity may help prevent future supply crises.

This is an Australian-specific analysis that may not directly reflect shortage patterns in other countries. The study used prescription data rather than patient outcomes, so it can't assess whether the shortages caused harm to individual patients. The Holt-Winters model assumes continuation of prior trends, which may not account for organic changes in prescribing behavior unrelated to shortages.