What is Wegovy? A Complete Guide to the Weight Loss Injection

Obesity is a major health concern in the UK, with more than 26% of adults living with the condition. Consequently, many people face an increased risk of type 2 diabetes, hypertension, heart attacks, and other weight-related diseases. If you’ve had difficulty losing weight even after adopting a healthy diet and exercise, consider using a prescription weight-loss medication like Wegovy.

In this guide, we’ll explain what Wegovy is, how weight loss injections work, who can use it safely, and its accessibility in the UK. Based on extensive research findings, we'll discuss how Wegovy helps people achieve steady weight loss and maintain a healthy weight long-term.

Key Takeaways

• Wegovy is a prescription medicine used to treat obesity or being overweight with related conditions among adults in the UK.
• It contains a GLP-1 analogue, semaglutide, that controls appetite and blood sugar levels.
• Clinical trials have shown that the average weight reduction achieved is between 15% and 20%. In some instances, patients lose weight faster, resulting in higher percentages.
• Wegovy works best when used together with a reduced-calorie diet and increased physical activity. 

What is Wegovy Injection?

Wegovy is a once-weekly injection used for chronic weight management in adults and adolescents aged 12 and older who live with obesity or are overweight with a weight-related health condition, such as high cholesterol or cardiovascular disease.
Wegovy contains the active ingredient semaglutide, which is a GLP-1 receptor agonist. A GLP-1 receptor agonist works similarly to a natural hormone in your body that controls appetite, calorie intake, and blood sugar levels.
Since it's a licensed medication in the UK, you can start your weight loss injections consultation and get your prescription online. At Curely, we prescribe Wegovy Injection, which is available on prescription from the NHS and online, and deliver treatment securely to your door.

Semaglutide Explained

Semaglutide works by binding to GLP-1 receptors in the brain, decreasing appetite and cravings. It also delays the emptying of food from the stomach, making you feel full between meals. At higher doses, semaglutide also reduces cardiovascular risk and lowers blood pressure and cholesterol levels, especially when used alongside a healthy diet and physical activity.
That's why Wegovy was approved by the United Kingdom’s National Institute for Health and Care Excellence (NICE) and the Medicines and Healthcare Products Regulatory Agency (MHRA) for prescription after rigorous clinical trials.

How Does Wegovy Work?

Wegovy works by mimicking GLP-1, a hormone that helps regulate appetite and food intake. As a result, it makes you feel less hungry and eat smaller portions.

Appetite Regulation and Hunger Signals

Wegovy acts on the brain to bind to receptors that regulate hunger and cravings. This reduces the frequency of feeling hungry, making it easier to cut down your calorie intake without feeling deprived.

Slowed Gastric Emptying

Wegovy also slows the rate at which you feel hungry between meals. It increases satiety by keeping food in your stomach longer, helping you eat less throughout the day.

Blood Sugar Modulation

Wegovy supports insulin production and decreases glucose output in the liver. It can help minimise the risks of developing type 2 diabetes and can improve the existing glucose control in overweight individuals.

Lifestyle Integration (Diet and Exercise)

Wegovy works best when used alongside a calorie-controlled diet and increased physical activity. At Curely, we provide support to help you adopt sustainable lifestyle changes and maintain a healthy BMI in the long term.

Effectiveness and Clinical Trial Results

Wegovy has shown significant results in clinical trials and real-world studies.

Weight Loss Evidence

• In the STEP 5 trial published in Nature Medicine by Rubino et al. (2022), participants taking Wegovy 2.4 mg weekly lost an average of 15% of their body weight over 104 weeks. In contrast, the placebo group lost just 2-3%.
• The STEP UP trial, published in The Lancet by Wharton et al. (2025), showed that the 7.2 mg dose achieved an average 20.7% weight loss after 72 weeks. One-third or more of the patients achieved a 25% or greater weight loss from their initial body weight.
• SELECT trial data, published in the New England Journal of Medicine (NEJM) by Wilding et al. (2023), confirmed that semaglutide reduced the risk of major cardiovascular events, including heart attack and stroke, by 20% in people with obesity and heart disease.
• A study by Rubino et al. (2024), published in Nature Medicine's SELECT analysis, reported that semaglutide enabled users to achieve a lower body mass index (BMI). This finding means that semaglutide can help patients achieve a healthy weight.

Maintaining a Healthy Weight

Sustainable weight loss is achieved through adherence to treatment while maintaining a healthy lifestyle and a reduced-calorie diet. If you abruptly discontinue Wegovy treatment, you may regain the weight lost.

Comparison with Other GLP-1 Weight Loss Drugs

Wegovy, Mounjaro, and Saxenda are all GLP-1-based prescription medicines licensed in the UK for managing weight, but they all have a slightly different approach and a varying purpose:

• Mounjaro (Tirzepatide): This is a double-action injection that binds to GLP-1 and GIP receptors. There is evidence suggesting it may lead to better weight loss than Wegovy, with the potential to lose 20% or more of body weight. It also regulates blood sugar levels.
• Wegovy (Semaglutide): A once-a-week injection approved to help with long-term weight loss. It suppresses hunger, slows the emptying of the stomach, and reduces blood sugar levels. Wegovy helps users lose an average of 15 to 20% of their body weight.
• Saxenda (Liraglutide): A daily injection that also stimulates GLP-1 receptors. Although effective, Saxenda tends to offer slightly less weight loss, around 5 to 10%, compared to the other medications on a daily injection regimen.

At Curely, we provide all three UK-licensed weight-loss medications, including Mounjaro and Saxenda. We'll first assess your goals, medical history, and lifestyle, and prescribe the most appropriate option.

Side Effects and Risks of Using Wegovy to Lose Weight

The body usually tolerates Wegovy, but like all other weight loss drugs, it can cause side effects.

Common Side Effects

The most common side effects include nausea, vomiting, diarrhoea, constipation, and headaches. Most of these symptoms are generally manageable in the first few weeks as the dosage builds up steadily.

Serious Side Effects

Some people may develop gallbladder issues, kidney problems, or pancreatic inflammation. In addition, a few users have reported hair loss, while hypoglycemia is a risk if users take any diabetes drugs along with Wegovy.

Managing Side Effects

Start on a low dose and increase gradually to your maximum dose to minimise side effects. Hydrate well, eat in small portions, and if symptoms continue, contact your health care provider.

Usage and Dosage Instructions

Wegovy is a once-weekly injection, delivered through a pre-filled pen.

Weekly Injection Schedule

You’ll start with 0.25 mg and gradually increase every four weeks until you reach the maximum dose of 2.4 mg or 7.2 mg, depending on your treatment plan. This approach helps your body adjust and reduces side effects.

How to Inject Safely

Inject into your upper arm, thigh, or abdomen. It's important to rotate injection sites each week to reduce the risk of skin irritation or lipodystrophy (changes in fat tissue). Avoid injecting into areas that are bruised, tender, swollen, or scarred

Eligibility for Wegovy: Who Can Take It

Wegovy is usually prescribed to adults with:

• A body mass index (BMI) ≥30, or
• A BMI of 27 or more with a weight-related health condition, such as high blood pressure, type 2 diabetes, or heart disease.

Patients from ethnic minority backgrounds, including Black African, South Asian, and Middle Eastern, are eligible at a lower BMI due to higher health risks. Patients with a history of pancreatitis, certain thyroid cancers, or kidney problems should not take Wegovy. Always review your medical history with a prescribing pharmacist.
NHS access requires a referral to specialist weight management services. That's why we offer private prescriptions through a quick online consultation, with no GP visits required, to minimise this hassle.

Frequently Asked Questions

How Can I Access Wegovy In the UK?

You can access Wegovy through the NHS when referred to a specialist weight management service, or privately via online clinics. For instance, Curely offers UK-licensed prescription weight loss treatments without the need for GP visits.

Who's Eligible for Prescribed Wegovy?

Healthcare professionals may prescribe Wegovy if your BMI is 30 or higher, or 27+ with conditions like type 2 diabetes or high cholesterol. Wegovy is particularly effective for helping people lose weight, especially those who haven't responded to conventional treatment.

How Much Weight Can I Lose from Using Wegovy?

Clinical studies show that patients using Wegovy lose 15% to over 20% of their body weight. How much weight you lose depends on your dosage, consistency, and your commitment to lifestyle changes like diet and physical activity. In the STEP trial by Rubino et al. (2022), the Wegovy group lost significantly more weight than those in the placebo group.

Can Wegovy Help With More Than Just Weight?

Yes. Wegovy helps regulate blood sugar, lower blood pressure, and reduce the risk of heart attack and stroke. It supports overall health by helping you lose excess weight.

Are there Wegovy Supply Issues in the UK?

Due to high demand, some pharmacies and clinics have experienced temporary shortages of Wegovy. That's why we work closely with suppliers to help ensure consistent availability for eligible patients.

How Does Wegovy Compare to Conventional Treatment?

Unlike conventional treatment that relies solely on diet and exercise, Wegovy supports patients biologically by reducing appetite and regulating hunger hormones. It works best when combined with lifestyle changes.

What is the Maintenance Dose of Wegovy?

The standard maintenance dose is 2.4 mg weekly. A higher dose (7.2 mg) may be prescribed in some cases for greater weight loss, depending on your response.

Will I Gain Weight if I Stop Taking Wegovy?

Yes, weight gain is common if the treatment stops and lifestyle changes aren’t maintained. Ongoing support with diet and physical activity is essential.

Conclusion: So, What is Wegovy?

Wegovy is a proven prescription weight-loss medication that delivers real results. It reduces appetite, supports blood sugar control, and helps lower blood pressure and cholesterol. Most importantly, it empowers you to achieve and maintain a healthy weight.
At Curely, we make access simple and discreet. With our quick online consultation, you can find out if you're eligible. After assessing your eligibility for the drug, we'll prescribe and deliver your treatment securely to your door. Start your consultation today and join the Wegovy group of thousands already seeing results.

References

Rubino, D., Abrahamsson, N., Davies, M., Hesse, D., Greenway, F. L., Jensen, C., Lingvay, I., Rigas, G., Rosenstock, J., Rubino, D. M., & Wadden, T. A. (2022). Two-year effects of semaglutide in adults with overweight or obesity: The STEP 5 trial. Nature Medicine, 28(10), 2073–2081.
Rubino, D. M., Greenway, F. L., Davies, M. J., et al. (2024). Long-term weight loss effects of semaglutide in obesity without diabetes in the SELECT trial. Nature Medicine, 30, 1234–1245.
Wharton, S., Davies, M. J., Rubino, D. M., et al. (2025). Once-weekly semaglutide 7.2 mg in adults with obesity (STEP UP): A randomised, controlled, phase 3b trial. The Lancet Diabetes & Endocrinology, 13(11), 949–960.
Wilding, J. P. H., Sørrig, R., Blüher, M., et al. (2023). Semaglutide and cardiovascular outcomes in obesity without diabetes. The New England Journal of Medicine, 389(24), 2233–2245.