Weight Loss Jabs Linked to Rare 'Eye Stroke' Risk, Study Warns
A recent study has raised concerns about a potential link between popular weight loss injections and a rare condition known as "eye stroke," medically termed non-arteritic anterior ischaemic optic neuropathy (Naion). This condition involves sudden vision loss due to reduced blood flow damaging the optic nerve, and researchers have identified semaglutide, the active ingredient in several widely used weight loss treatments, as a possible contributing factor.
Key Findings from the Study
The analysis, which examined reports from the US Food and Drug Administration (FDA), found that Wegovy, a semaglutide-based injection, was associated with an almost five times greater risk of Naion compared to Ozempic, another medication containing semaglutide. Additionally, the study revealed that men appear to face a three times higher risk of experiencing this vision loss side effect than women, highlighting potential gender-based disparities in susceptibility.
Possible Mechanisms Behind the Link
Researchers suggest that the rapid weight loss induced by high doses of Wegovy, along with potential fluctuations in blood pressure, could disrupt the delicate blood circulation in the eye. This disruption may lead to the reduced blood flow that characterizes Naion, though the exact biological pathways remain under investigation. The study emphasizes that while this side effect is serious, it remains rare, and more research is needed to fully understand the underlying causes and risk factors.
Ongoing Research and Manufacturer Response
Further studies are required to establish safe dosage levels for semaglutide-based treatments and to identify specific risk factors that might increase the likelihood of Naion. Despite the identified link, Novo Nordisk, the manufacturer of Wegovy and Ozempic, maintains that semaglutide has a favourable benefit-risk profile, indicating that the overall advantages of the medication for weight loss and related health benefits outweigh the potential risks for most patients. However, healthcare professionals are advised to monitor patients closely for any signs of vision changes during treatment.
What Is an Eye Stroke?
Non-arteritic anterior ischaemic optic neuropathy (Naion), commonly referred to as an "eye stroke," is a medical emergency where sudden, painless vision loss occurs in one eye due to insufficient blood supply to the optic nerve. Symptoms can include blurriness, dark spots, or complete loss of vision, and prompt medical attention is crucial to prevent permanent damage. While rare, this condition has now been linked to weight loss injections, adding a new consideration for patients and doctors in managing obesity treatments.
