Wegovy is one of the most effective weight loss medications available. In clinical trials, people taking it lost roughly 15% of their body weight over about 16 months, a result that far exceeds older weight loss drugs. It works, but it comes with real trade-offs in terms of side effects, cost, and the need for long-term use to keep the weight off.
How Much Weight People Actually Lose
The major clinical trial behind Wegovy’s approval enrolled nearly 2,000 adults with obesity or overweight plus at least one weight-related health condition. Over 68 weeks, participants taking Wegovy alongside diet and exercise changes lost an average of about 15% of their starting body weight, compared to roughly 2.4% in the group that got a placebo with the same lifestyle changes. For someone starting at 250 pounds, that’s the difference between losing around 37 pounds versus 6 pounds.
That 15% figure is an average. Some people lose significantly more, while others see more modest results. Individual response varies depending on factors like starting weight, diet, activity level, and how well someone tolerates the medication at its full dose.
How Wegovy Works in the Body
Wegovy’s active ingredient mimics a hormone your gut naturally releases after eating. This hormone signals your brain to feel full, slows how quickly food leaves your stomach, and reduces appetite. The net effect is that you feel less hungry throughout the day and get satisfied with smaller portions. It’s a once-weekly injection you give yourself, typically in the abdomen, thigh, or upper arm.
The dose ramps up gradually over about four months to minimize stomach-related side effects. You start at a low dose for the first four weeks, then increase every four weeks until reaching the maintenance dose by week 17. Most adults stay on 2.4 mg per week, though some remain at a slightly lower dose if they can’t tolerate the full amount.
Benefits Beyond the Scale
Weight loss alone improves many health markers, but Wegovy appears to offer cardiovascular protection on top of that. The SELECT trial, a large study of people with established heart disease, found that semaglutide (Wegovy’s active ingredient) reduced the risk of major cardiovascular events like heart attacks and strokes by 20%. This result was significant enough that the FDA expanded Wegovy’s approved uses to include reducing cardiovascular risk in certain patients.
People in clinical trials also saw improvements in blood pressure, blood sugar levels, and cholesterol. For those with prediabetes, Wegovy can delay or prevent the progression to type 2 diabetes.
Common Side Effects
Stomach and digestive issues are by far the most frequent complaints. Nausea is the most common, particularly during the dose escalation phase when your body is adjusting. Diarrhea, vomiting, and constipation are also reported frequently. For most people, these symptoms are mild to moderate and improve over time, but a meaningful percentage of trial participants discontinued the medication because of them.
The gradual dose increase exists specifically to ease you into the medication. Skipping steps or increasing too quickly tends to make side effects worse. Eating smaller meals, avoiding high-fat foods, and staying hydrated can help manage nausea during the adjustment period.
Important Safety Considerations
Wegovy carries an FDA boxed warning, the most serious type of safety alert, related to thyroid tumors. In animal studies, semaglutide caused thyroid C-cell tumors at doses similar to what humans take. Whether this translates to humans remains unknown, but the medication is contraindicated for anyone with a personal or family history of medullary thyroid carcinoma or a condition called Multiple Endocrine Neoplasia syndrome type 2.
Other notable risks include inflammation of the pancreas (pancreatitis), gallbladder problems, and, in people with diabetes, the possibility of low blood sugar when combined with other glucose-lowering medications. Rare but serious allergic reactions have also been reported.
What Happens When You Stop
This is the part many people don’t anticipate. A 2025 systematic review published in The BMJ found that people regain weight at a rate of about 0.8 kg (roughly 1.8 pounds) per month after stopping newer medications like Wegovy. Within the first year off treatment, the average weight regain was approximately 10 kg (22 pounds), with a projected return to baseline weight about 1.5 years after stopping.
This pattern reflects the biology of obesity itself. The hormonal signals that drive hunger and slow metabolism don’t reset permanently because of medication. When the drug is removed, those signals return. For most people, Wegovy is effective only as long as they continue taking it, which means thinking of it as a long-term or indefinite treatment rather than a temporary fix.
Who Can Get a Prescription
The FDA approves Wegovy for adults with a BMI of 30 or higher (the clinical threshold for obesity) or a BMI of 27 or higher if they also have at least one weight-related condition such as high blood pressure, type 2 diabetes, or high cholesterol. It’s also approved for adolescents aged 12 and older whose BMI is at or above the 95th percentile for their age and sex. In all cases, it’s meant to be used alongside a reduced-calorie diet and increased physical activity, not as a standalone treatment.
What It Costs
Cost remains one of the biggest barriers. Through the manufacturer’s direct pricing program, Wegovy starts at $199 per month for the lowest doses, rising to $349 per month at the standard maintenance dose and $399 per month for the highest available dose. These are the self-pay prices offered through the manufacturer’s pharmacy. Without any savings program or insurance coverage, the retail price at a typical pharmacy can be substantially higher.
Insurance coverage varies widely. Some commercial plans cover Wegovy, particularly when prescribed for patients who meet specific BMI and comorbidity criteria, while others exclude weight loss medications entirely. Medicare has historically not covered anti-obesity medications, though policy discussions are ongoing. If you’re considering Wegovy, checking your specific plan’s formulary before starting is worth the effort, since out-of-pocket costs over months or years add up quickly given the long-term nature of treatment.