Key takeaways
Clinical studies show an average weight loss of 15% over 68 weeks when Wegovy is combined with diet and exercise.
Wegovy is available as both a weekly subcutaneous injection that peaks within three days and a daily oral tablet that absorbs within one hour.
Patients must take the daily oral tablet in the morning on an empty stomach, whereas they can administer the weekly injection at any time of day regardless of food.
The most common adverse reactions involve gastrointestinal distress, and the treatment carries a boxed warning due to the risk of thyroid C-cell tumors.
Wegovy (semaglutide) is an injected and oral prescription medication approved by the U.S. Food & Drug Administration (FDA) for chronic weight management in adults and children 12 years and older—along with a reduced-calorie diet and increased exercise. While individual results vary, a New England Journal of Medicine (NEJM) clinical study showed that people who took semaglutide lost an average of 15% of their body weight over a period of 68 weeks.
Many people ask: How long will Wegovy take to work? The short answer is that it may start working within a few weeks. However, to get the best results, you need to take Wegovy as prescribed, combining it with dietary changes and increased physical activity.
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How does Wegovy work?
Glucagon-like peptide-1 (GLP-1) is a hormone that regulates appetite and calorie intake. According to the prescribing information, Wegovy is a GLP-1 receptor agonist that works by binding to and activating the GLP-1 receptor in the brain. By doing so, it helps decrease appetite and regulate food intake, helping people eat less. It also delays stomach emptying, which makes people feel full for longer.
How to take Wegovy
Wegovy is now available as oral tablets and autoinjector pens. The tablets should be taken once daily on an empty stomach in the morning with up to four ounces of water. It should not be taken with any other liquid. You should wait at least 30 minutes to eat, drink, or take other medications after taking a Wegovy pill. Your healthcare provider can teach you how to use Wegovy autoinjector pens. When selecting a Wegovy injection site, you can choose from the stomach, thigh, or upper arm once weekly. Be sure to choose a different injection site each week.
You can inject Wegovy at any time of the day, but it should be injected on the same day each week. If you need to change the injection day, you can talk to your prescriber or pharmacist to determine the best way to change it. If you miss an injected dose of Wegovy and your next dose is more than two days away, inject your dose right away. If you miss an injected dose of Wegovy and your next dose is less than two days away, you can skip the missed dose and take the next dose on the regularly scheduled day. If you miss Wegovy injections for more than 14 days, you can take your next dose on the regularly scheduled day or consult your healthcare provider on how to restart treatment. If you miss a Wegovy tablet dose, skip the missed dose and continue taking one tablet daily the next morning.
Your healthcare provider will give you instructions on how to slowly increase your Wegovy dose. Generally, you will inject a dose of 0.25 mg every week for one month, then 0.5 mg every week during the second month. In the third month, you will inject 1 mg every week, and in the fourth month, you will inject 1.7 mg every week. For the fifth month and thereafter, your healthcare provider will let you know if you should keep the dose at 1.7 mg per week or increase it to 2.4 mg weekly. Wegovy tablets are typically started at 1.5 mg daily for 30 days, then increased every 30 days to achieve the maintenance dose, which is usually 25 mg daily. These titration doses help the body adjust to the medication and reduce the risk of side effects.
You can take Wegovy autoinjector pens with or without food, but the tablets should be taken on an empty stomach in the morning, at least 30 minutes before anything else is consumed.
How long does it take for Wegovy to work?
Wegovy starts working right away, reaching its maximum concentration in the body within one to three days for the pen and one hour for the tablet. However, it can take about one to four weeks for both dosage forms to start showing effects after consistent dosing because the medication has to build up in the body.
Keep in mind that everyone is slightly different, so the time that it takes to become effective may vary. Most patients will notice a reduced appetite within the first few weeks. The maximum effects can occur after taking it for a few months. The dose is gradually increased each month as well, helping the effects increase even more over the first few months.
RELATED: Can I start Wegovy at 1.7 mg?
Always remember that the rate of weight loss is different for each person. It may seem like the weight falls off for some individuals, while others struggle more. Studies have found that using Wegovy with lifestyle changes (like eating a healthy diet and exercising) leads to a significant reduction in body weight. What’s more, the weight loss results tend to be sustained, meaning you are likely to keep the weight off with continued use of Wegovy and lifestyle changes. According to the NEJM study, after 68 weeks of treatment (1.3 years):
- 86% of participants lost 5% or more of their body weight, which equates to a weight loss of 11 pounds for someone who started at 220 pounds.
- 69% of participants lost 10% or more of their body weight, which equates to a weight loss of 22 pounds for someone who started at 220 pounds.
- 51% of participants lost 15% or more of their body weight, which equates to a weight loss of 33 pounds for someone who started at 220 pounds.
- 32% of participants lost 20% or more of their body weight, which equates to a weight loss of 44 pounds for someone who started at 220 pounds.
Wegovy weight loss after 68 weeks |
||
|---|---|---|
| Percent of body weight lost | Percent of study participants who achieved this loss | Estimated weight loss if starting weight was 220 pounds (lbs) |
| 5% or more | 86% | 11 lbs |
| 10% or more | 69% | 22 lbs |
| 15% or more | 51% | 33 lbs |
| 20% or more | 32% | 44 lbs |
Because individual results can depend on many factors, you can talk with your healthcare provider about how much weight you can expect to lose with Wegovy, as well as other lifestyle changes that may help with your weight loss journey.
Wegovy vs. Ozempic
Ozempic and Wegovy both contain the active ingredient semaglutide, and both are made by the pharmaceutical manufacturer Novo Nordisk.
Wegovy is FDA-approved as a weight loss drug. Ozempic is FDA-approved to control blood sugar levels in adults with Type 2 diabetes. Ozempic can also be used to lower the risk of cardiovascular events, like heart attack and stroke, in adults with both Type 2 diabetes and heart disease. Some healthcare providers prescribe Ozempic off-label (for a use that is not FDA-approved) because it can help people lose weight.
Because Ozempic and Wegovy contain the same ingredient, they have many similarities. For example, they are both weekly injections and have the same side effects. Their dosages vary—Ozempic goes up to a maximum dosage of 2 mg per week, while Wegovy’s highest dosage is 2.4 mg per week. Therefore, studies typically show that Wegovy shows more weight loss. Additionally, Ozempic is not approved for weight loss, so studies are limited, and those studies that show weight loss often have diabetic patients starting at normal weights, so the data can be difficult to interpret.
Because Wegovy and Ozempic are similar, the decision between one or the other may simply come down to factors like cost and insurance coverage. You can talk with your healthcare provider for more information about these medications.
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Is Wegovy safe?
Common Wegovy side effects are mostly gastrointestinal and include:
- Nausea
- Vomiting
- Diarrhea
- Stomach pain
- Constipation
- Heartburn
- Burping
- Runny nose
- Sore throat
- Headache
RELATED: Does Wegovy make you tired?
Wegovy has a boxed warning, also known as a black box warning, which is the most serious warning required by the FDA. The warning states that the ingredient semaglutide has caused thyroid tumors in animal studies. It is not known whether this may occur in people who take Wegovy. Therefore, people who have a personal or family history of medullary thyroid carcinoma (MTC) or people with multiple endocrine neoplasia type 2 (MEN 2) should never take Wegovy. Also, anyone who takes Wegovy should be alert to symptoms of thyroid tumors, such as a lump in the neck, a hoarse voice, shortness of breath, or difficulty swallowing.
Serious side effects may also occur with Wegovy. While allergic reactions are rare, if you have symptoms such as hives, difficulty breathing or swallowing, or swelling of the face, lips, tongue, or throat, get emergency medical help.
Other serious reactions include, but are not limited to:
- Suicidal thoughts or behavior: Be alert to any changes in mood or behavior and notify your healthcare provider right away if changes occur, or call 988 for the Suicide and Crisis Lifeline.
- Vision changes: Semaglutide may cause a worsening of diabetic retinopathy in people with diabetes.
- Pancreas problems: Symptoms may include severe stomach pain, which may spread to the back, nausea, and a fast heart rate.
- Gallbladder problems: Symptoms may include upper stomach pain, fever, clay-colored stools, and yellowing of the skin and whites of the eyes.
- Kidney problems: Symptoms may include swelling, tiredness, and decreased urination.
- Low blood sugar: Symptoms may include dizziness, sweating, blurry vision, headache, confusion, shaking, and hunger.
This is not a full list of side effects. Others may occur. Consult your healthcare provider for more information about Wegovy’s side effects.
Bottom line
Wegovy starts working within a few days of taking it, but it could take weeks or months to see results. How quickly Wegovy works depends on various factors, such as diet, exercise, and the body’s unique metabolic response to the drug. Most people who take Wegovy lose an average of 15% of their body weight within a year and four months. To get the best results, you need to take Wegovy as prescribed, eat well, and increase your physical activity levels. Speak with your healthcare provider about whether Wegovy is right for you.
Frequently asked questions
How soon does Wegovy start working?
Although Wegovy reaches its maximum concentration relatively quickly (one hour for the tablet and one to three days for the pen), it can take one to four weeks to start showing effects. It can take a few months to reach the maximum effects.
What if Wegovy isn’t working after a month?
If Wegovy is not working after a month of taking it, do not be discouraged. It can take a few weeks to months to see initial results, and a few months to show the maximum effects. The time it takes to see benefits can vary per person. If you do not experience weight loss after six months, talk to your healthcare provider about increasing your dose or switching to an alternate medication.
How long does Wegovy stay in your system?
Wegovy stays in the system for about five to seven weeks after the last dose is taken.
The SingleCare prices in this article are the most accurate at the time of publishing in ZIP code 23666 as of Oct. 27, 2026. Prices vary by pharmacy. Visit our coupon page for updated drug prices at pharmacies near you.
- Highlights of prescribing information, Novo Nordisk (2026)
- Wegovy- semaglutide injection, solution, tablet, DailyMed (2026)
- Once-weekly semaglutide in adults with overweight or obesity, The New England Journal of Medicine (2021)
- Ozempic- semaglutide injection, solution, DailyMed (2026)
- Semaglutide injection, MedlinePlus (2026)
- Update on semaglutide risks, American Academy of Ophthalmology (2021)
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