Ozempic is a prescription medication approved to treat type 2 diabetes in adults. It contains semaglutide, a once-weekly injection that lowers blood sugar, and it now carries three distinct FDA approvals: improving blood sugar control, reducing cardiovascular risk in people with type 2 diabetes and heart disease, and slowing kidney disease progression in people with type 2 diabetes and chronic kidney disease. First approved in 2017, Ozempic has expanded well beyond a standard diabetes drug.
How Ozempic Works in Your Body
Ozempic mimics a natural gut hormone called GLP-1 that your body releases after eating. By activating the same receptors as this hormone, it triggers three things at once: it prompts your pancreas to release more insulin (which pulls sugar out of your blood), it blocks glucagon (a hormone that raises blood sugar), and it slows how quickly your stomach empties food into your digestive tract. That last effect means sugar from meals enters your bloodstream more gradually, preventing the sharp spikes that make diabetes harder to manage.
Because your stomach empties more slowly, you also tend to feel full longer. This is why many people on Ozempic lose weight, even though the drug is not officially approved for weight loss on its own.
The Three FDA-Approved Uses
Blood Sugar Control in Type 2 Diabetes
The primary use of Ozempic is lowering blood sugar alongside diet and exercise. It is not for type 1 diabetes or for treating dangerously high blood sugar emergencies. It works as a long-acting therapy, injected once a week, to keep blood sugar levels steadier over time.
Cardiovascular Protection
For adults who have both type 2 diabetes and established heart disease, Ozempic is approved to reduce the risk of heart attack, stroke, and cardiovascular death. In combined clinical trial data, semaglutide lowered the rate of these major cardiovascular events by about 24% compared to placebo.
Kidney Disease
The newest approved use addresses chronic kidney disease in people with type 2 diabetes. A large international trial called FLOW, involving over 3,500 participants across 28 countries, found that semaglutide slowed the yearly decline in kidney function and reduced cardiovascular deaths by 24% in this population. Deaths from any cause dropped by 20%. The trial was notable because patients on semaglutide actually had fewer serious side effects than those on placebo, which is uncommon in studies of this size.
Ozempic vs. Wegovy for Weight Loss
You’ve probably heard Ozempic mentioned alongside weight loss. Both Ozempic and Wegovy contain the same active ingredient, semaglutide, but they are approved for different purposes. Ozempic is approved for type 2 diabetes management. Wegovy is approved for weight management in adults and children 12 and older, for a type of liver disease called MASH, and for reducing cardiovascular risk in adults with obesity or overweight who also have heart disease.
Wegovy also goes to a higher dose: up to 2.4 mg weekly compared to Ozempic’s maximum of 2 mg. This makes Wegovy the better-studied option specifically for weight loss. When doctors prescribe Ozempic and a patient happens to lose weight, that’s a recognized side effect of the medication, but it’s technically an off-label benefit rather than the drug’s intended purpose.
What Taking Ozempic Looks Like
Ozempic is injected under the skin once a week, on the same day each week, at whatever time of day is convenient. It can be taken with or without food. The injection sites are typically the abdomen, thigh, or upper arm, and you rotate spots each week.
You don’t start at the full dose. The first four weeks use a low 0.25 mg dose that isn’t actually meant to control blood sugar. It’s there to let your body adjust and minimize side effects. After that, your dose increases to 0.5 mg, and your doctor may raise it further over time depending on how well your blood sugar responds. The maximum recommended dose is 2 mg per week.
Before first use, pens need refrigeration between 36°F and 46°F. Once you’ve started using a pen, it stays good for up to 56 days at room temperature (59°F to 86°F) or in the fridge. Never freeze it.
Common Side Effects
The most frequently reported side effects are gastrointestinal: nausea, vomiting, diarrhea, abdominal pain, and constipation. Each of these occurs in at least 5% of patients in clinical trials. Nausea is the most common and tends to be worst during the early weeks and dose increases. The gradual dose escalation schedule exists specifically to reduce the severity of these effects. For most people, the nausea fades as their body adjusts over the first month or two.
Important Safety Concerns
Ozempic carries a boxed warning, the most serious type the FDA issues, about thyroid tumors. In animal studies, semaglutide caused thyroid C-cell tumors at doses comparable to what humans take. Whether this risk translates to people remains unknown. Because of this uncertainty, Ozempic is not an option for anyone with a personal or family history of medullary thyroid carcinoma or a condition called Multiple Endocrine Neoplasia syndrome type 2.
Signs worth paying attention to include a lump or swelling in the neck, difficulty swallowing, shortness of breath, or persistent hoarseness. These could indicate thyroid changes, though they can also have other causes. The medication is also contraindicated for anyone who has had a serious allergic reaction to semaglutide or any inactive ingredient in the pen.