Victoza is a prescription injectable medication used to treat type 2 diabetes. It is FDA-approved for two specific purposes: improving blood sugar control alongside diet and exercise, and reducing the risk of heart attack, stroke, and cardiovascular death in adults with type 2 diabetes who already have heart disease. It is approved for adults and children aged 10 and older with type 2 diabetes, but it is not for type 1 diabetes.
How Victoza Works
Victoza contains a drug called liraglutide, which mimics a natural hormone your body releases after eating. This hormone signals your pancreas to produce more insulin when blood sugar rises, slows digestion so glucose enters your bloodstream more gradually, and reduces the amount of sugar your liver releases between meals. The combined effect is lower, more stable blood sugar throughout the day.
You inject Victoza once daily under the skin of your abdomen, thigh, or upper arm. It can be taken at any time of day, with or without food, though sticking to a consistent time helps build a routine.
Blood Sugar Control
In real-world studies of patients using Victoza, average A1c levels dropped by about 0.9 percentage points. That is a meaningful reduction for most people with type 2 diabetes. Patients who started with higher blood sugar saw even larger improvements: those with a baseline A1c above 9% experienced significantly greater drops than those who began below that threshold.
Victoza is typically used alongside other diabetes treatments rather than on its own. It can be combined with metformin, certain other oral medications, or long-acting insulin, depending on what your blood sugar levels require.
Heart Health Benefits
Victoza carries a second FDA-approved indication that sets it apart from many diabetes medications: it reduces the risk of major cardiovascular events in adults with type 2 diabetes and existing heart disease. The evidence comes from the LEADER trial, a large study that followed thousands of patients at high cardiovascular risk. Compared to placebo, Victoza lowered the combined risk of cardiovascular death, non-fatal heart attack, and non-fatal stroke by 13%.
The benefit held up across different patient groups. Those who had already survived a heart attack or stroke saw a reduction from 20.4% to 17.3% in major cardiovascular events. Patients with established artery disease but no prior heart attack or stroke also benefited, with event rates dropping from 12.9% to 10.3%. The trial also found that Victoza reduced the risk of kidney-related complications in both groups, a meaningful secondary benefit since diabetes and heart disease both strain the kidneys.
Victoza vs. Saxenda for Weight Loss
One of the most common points of confusion is whether Victoza can be used for weight loss. Victoza and Saxenda contain the exact same active ingredient, liraglutide, but they are approved for different conditions and prescribed at different doses. Victoza is approved only for type 2 diabetes, with a maximum daily dose of 1.8 mg. Saxenda is approved specifically for chronic weight management, with a higher maximum dose of 3 mg per day.
People taking Victoza for diabetes often do lose some weight as a side effect, since the medication slows digestion and can reduce appetite. But Victoza is not indicated for weight loss on its own, and the two products should never be used together or combined with any other medication in the same drug class.
Saxenda is intended for adults with a BMI of 30 or higher, or a BMI of 27 or higher if they also have a weight-related condition like high blood pressure or high cholesterol. Notably, Saxenda’s labeling states it is not indicated for treating type 2 diabetes, making the two products essentially mirror images of each other in terms of approved use.
Starting and Adjusting the Dose
Victoza follows a gradual dose-increase schedule designed to minimize stomach-related side effects. You start at 0.6 mg once daily for the first week. This starting dose is not intended to control blood sugar on its own; it simply gives your body time to adjust. After one week, the dose increases to 1.2 mg daily. If blood sugar control is still not where it needs to be, your prescriber can raise the dose to the maximum of 1.8 mg daily.
Common Side Effects
The most frequent side effects are digestive. Nausea is the one patients report most often, particularly during the first few weeks and when the dose increases. Diarrhea, vomiting, decreased appetite, and constipation also occur. For most people, these symptoms are mild to moderate and fade as the body adjusts over a few weeks. The gradual dose titration schedule exists specifically to reduce the severity of these effects.
Because Victoza slows how quickly your stomach empties, it can theoretically affect how fast your body absorbs other oral medications you take. Clinical testing found no significant impact on absorption, but it is still worth mentioning to your prescriber so they can review timing if needed.
Thyroid Risk and Who Should Not Use It
Victoza carries a boxed warning, the most serious type of FDA safety alert, regarding thyroid tumors. In animal studies, liraglutide caused tumors in thyroid cells called C-cells in both rats and mice. The risk increased with higher doses and longer treatment. Whether this translates to humans remains unknown, and no definitive link to thyroid cancer in people has been established.
As a precaution, Victoza is completely off-limits for anyone with a personal or family history of medullary thyroid carcinoma, a rare type of thyroid cancer, or a genetic condition called Multiple Endocrine Neoplasia syndrome type 2. While taking Victoza, be aware of potential warning signs like a lump in your neck, difficulty swallowing, shortness of breath, or persistent hoarseness. Routine thyroid screening through blood tests or ultrasound has not been shown to reliably detect problems early in patients on this medication.