Ozempic has become one of the world’s most talked-about medications in recent years. The drug is widely used to help people with type 2 diabetes control their blood sugar levels, and it has also gained attention for helping with weight loss.
Many patients have benefited from the medication, and doctors often consider it an important tool for managing diabetes.
However, new research from scientists at the University of Southern Denmark suggests that Ozempic may also carry a rare but serious risk involving eyesight. Two large studies have found that people with type 2 diabetes who use Ozempic may be more likely to develop a condition called NAION, which can lead to sudden vision loss.
NAION stands for non-arteritic anterior ischemic optic neuropathy. Although the name sounds complicated, the condition affects a very important part of the eye called the optic nerve.
The optic nerve carries visual information from the eye to the brain. If blood flow to this nerve is suddenly reduced, the nerve can become damaged.
This damage may cause sudden vision loss in one eye, sometimes without warning. In some cases, the vision loss can become permanent. NAION is considered rare, but it is one of the most common causes of sudden optic nerve-related blindness in older adults.
Scientists first became concerned about a possible link between Ozempic and NAION after a smaller study in the United States suggested that people taking the drug had more than double the risk of developing the condition.
The new research from Denmark and Norway now provides much stronger evidence because it involved a far larger group of patients.
The researchers studied medical records from more than 424,000 people with type 2 diabetes. Among them, over 106,000 people were using Ozempic. The scientists compared people taking Ozempic with people using other diabetes medications.
The results showed that Ozempic users were about twice as likely to develop NAION compared to people using other diabetes drugs. The increased risk appeared consistently across the studies.
Professor Jakob Grauslund, an expert in eye diseases and one of the researchers involved, said the number of NAION cases in Denmark has increased noticeably since Ozempic became widely available in 2018.
Before the drug became common, Denmark usually saw around 60 to 70 NAION cases per year. In recent years, that number has increased to as many as 150 cases annually, with most cases occurring in people with type 2 diabetes.
A second study led by Professor Anton Pottegård took a slightly different approach. Instead of simply comparing all Ozempic users with all other diabetes patients, the researchers focused on people who had just started treatment.
They compared new Ozempic users with patients beginning other diabetes medications to make the comparison fairer and more accurate.
Even with this different method, the findings remained the same. People using Ozempic still showed about twice the risk of developing NAION.
Despite these findings, researchers stress that the condition remains very rare. Most people taking Ozempic will never develop NAION or experience vision loss. The studies do not suggest that everyone should stop using the medication.
Experts say the benefits of Ozempic for controlling blood sugar and reducing diabetes complications are still very important. Type 2 diabetes itself can cause serious health problems, including heart disease, kidney damage, nerve problems, and blindness if it is not properly managed.
Professor Kurt Højlund, a specialist in diabetes care, explained that treatment decisions should always balance benefits and risks. For some patients who already have eye problems or who may be at particularly high risk of vision loss, doctors may consider whether another medication would be safer.
Researchers also noted that people who have already experienced NAION in one eye may need to discuss stopping Ozempic with their doctor in order to reduce the risk of damage to the other eye.
Doctors strongly advise patients not to suddenly stop taking Ozempic without medical guidance. Suddenly stopping diabetes medication could lead to poorly controlled blood sugar and other serious health complications.
Instead, the new research is meant to help doctors and patients make more informed decisions together. Patients using Ozempic should pay attention to any sudden changes in vision, such as blurry vision, dark areas in sight, or sudden vision loss, and seek medical help immediately if these symptoms appear.
The findings have already been reported to health authorities in Denmark and other countries. Researchers hope the information will support more personalized diabetes treatment plans in the future, especially for patients who may have higher risks of eye disease.
The studies were published in the scientific journal International Journal of Retina and Vitreous, and additional findings were also shared as a preprint on medRxiv.
The research highlights an important reality about modern medicine. Even highly effective drugs can sometimes have unexpected side effects. Understanding these risks allows doctors and patients to work together more carefully and choose the safest treatment for each individual person.
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