Ozempic and Wegovy both contain semaglutide, so what is the difference? A clear UK guide to licences, doses, weight loss results, NHS access and which you can get.
What is the difference between Ozempic and Wegovy?
Ozempic and Wegovy contain exactly the same active ingredient, semaglutide, and are made by the same company. The difference is what they are licensed for and the doses they come in.
In the UK:
- Ozempic is licensed to treat type 2 diabetes. Its maximum dose is 2 mg once a week.
- Wegovy is licensed for weight management. Its standard maintenance dose is 2.4 mg once a week.
So although the name "Ozempic" is often used in the media as a catch-all term for weight loss injections, Ozempic is not licensed for weight loss in the UK.
If you are looking for semaglutide to help you lose weight, the appropriate licensed product is Wegovy.
This guide explains the similarities and differences in detail, why the two brands exist, how the results compare, and where Mounjaro fits in.
Ozempic vs Wegovy at a glance
Active ingredient
- Ozempic: semaglutide
- Wegovy: semaglutide
Manufacturer
- Ozempic: Novo Nordisk
- Wegovy: Novo Nordisk
UK licence
- Ozempic: type 2 diabetes in adults
- Wegovy: weight management, and reducing cardiovascular risk in certain adults with established cardiovascular disease and overweight or obesity
How it is taken
- Ozempic: once-weekly injection
- Wegovy: once-weekly injection
Doses
- Ozempic: 0.25 mg, 0.5 mg, 1 mg, 2 mg
- Wegovy: 0.25 mg, 0.5 mg, 1 mg, 1.7 mg, 2.4 mg, with a higher 7.2 mg dose approved for some adults
Main goal
- Ozempic: lowering blood sugar
- Wegovy: reducing body weight
What is semaglutide?
Semaglutide belongs to a group of medicines called GLP-1 receptor agonists.
It mimics a natural gut hormone, GLP-1, which is released after eating.
Semaglutide:
- Stimulates insulin release when blood sugar is high
- Reduces the release of glucagon, a hormone that raises blood sugar
- Slows the emptying of the stomach
- Acts on appetite centres in the brain, reducing hunger and increasing fullness
The first two effects are particularly useful in type 2 diabetes. The last two lead to weight loss.
It was while studying semaglutide for diabetes that researchers saw how much weight participants were losing. This led to dedicated trials at a higher dose for weight management, and to Wegovy.
Why are there two brand names for the same medicine?
Medicines are licensed for specific uses, at specific doses, based on the clinical trials submitted to regulators.
- Ozempic was studied in people with type 2 diabetes, in the SUSTAIN trials, at doses up to 2 mg.
- Wegovy was studied in people with overweight or obesity, in the STEP trials, at a dose of 2.4 mg.
Because the trials, doses and intended patients were different, the two were approved as separate products with separate names, pens and patient information.
This also helps to ensure that each group of patients has a dedicated supply of the product intended for them.
How do the doses compare?
Ozempic
- Starting dose: 0.25 mg weekly for four weeks
- Then 0.5 mg weekly
- Can be increased to 1 mg, and then to a maximum of 2 mg, if needed for blood sugar control
Wegovy
- 0.25 mg for four weeks
- 0.5 mg for four weeks
- 1 mg for four weeks
- 1.7 mg for four weeks
- 2.4 mg maintenance dose from week 17
A higher 7.2 mg dose of Wegovy was approved in the UK in January 2026 for some adults with obesity who need additional weight loss.
So Wegovy reaches a higher dose of semaglutide than Ozempic, and it is this higher dose that was shown to produce greater weight loss.
For a step-by-step explanation, see our Wegovy dosage guide.
Is Wegovy "stronger" than Ozempic?
The medicine is identical. The difference is the amount.
At the same dose, for example 1 mg, Ozempic and Wegovy would be expected to have the same effect in the body.
Wegovy's maintenance dose of 2.4 mg is higher than Ozempic's maximum of 2 mg, which is why Wegovy is associated with greater average weight loss.
How much weight do people lose?
Wegovy
In the STEP 1 trial, adults with overweight or obesity who did not have diabetes lost an average of 14.9% of their body weight over 68 weeks on semaglutide 2.4 mg, compared with 2.4% with placebo.
Ozempic
Ozempic's trials were designed to measure blood sugar control in people with type 2 diabetes, not weight loss. Participants did lose weight, typically in the region of 4 to 7 kg on average depending on the dose, which is less than seen with Wegovy.
Two things explain the difference:
- The dose is lower
- People with type 2 diabetes tend to lose less weight on these medicines than people without diabetes
For a realistic picture of what to expect, read our article on how much weight you can lose on Mounjaro or Wegovy.
Can you get Ozempic for weight loss in the UK?
Ozempic is not licensed for weight loss in the UK, and you should not expect a reputable service to supply it for that purpose.
When demand for these medicines surged, there were prolonged shortages of GLP-1 medicines for people with type 2 diabetes. National guidance was issued advising prescribers to use these medicines only for their licensed indications, so that people with diabetes could continue to get the treatment they depend on.
Prescribing a medicine outside its licence is known as off-label prescribing. It is legal in some circumstances, but it is not appropriate when a licensed alternative exists.
For weight management, licensed alternatives do exist:
If a website or seller offers you Ozempic for weight loss with few questions asked, treat it as a warning sign. Ozempic has been one of the most frequently counterfeited medicines in recent years. Read our guide to fake weight loss injections.
Who is each medicine for?
Ozempic
Ozempic is for adults with type 2 diabetes whose blood sugar is not adequately controlled, used alongside diet and exercise, either alone or with other diabetes medicines.
It is usually prescribed by a GP or diabetes team on the NHS.
Wegovy
Wegovy is for weight management in adults with:
- A BMI of 30 or more, or
- A BMI of 27 or more with at least one weight-related health condition
It is used alongside a reduced-calorie diet and increased physical activity.
Wegovy is also licensed to reduce the risk of major cardiovascular events, such as heart attack and stroke, in adults with established cardiovascular disease and a BMI of 27 or more.
To check whether you may qualify, read Am I eligible for weight loss injections?
Availability on the NHS
Ozempic
Ozempic is available on NHS prescription for type 2 diabetes, in line with NICE guidance on when GLP-1 medicines should be used.
Wegovy
Wegovy is available on the NHS for weight management, but access is limited. It is generally prescribed through specialist weight management services for people who meet stricter criteria than the licence, and NHS treatment is time-limited.
Privately
Wegovy is available privately through registered pharmacies and clinics, following a clinical assessment, for people who meet the licensed criteria.
Are the side effects the same?
Yes, broadly. Because they contain the same medicine, Ozempic and Wegovy share the same side effect profile.
The most common are:
- Nausea
- Diarrhoea
- Constipation
- Vomiting
- Stomach pain
- Indigestion, reflux and burping
- Tiredness
- Headache
Side effects are more likely at higher doses, so they may be more noticeable at Wegovy's 2.4 mg than at lower Ozempic doses.
Less common but serious risks include pancreatitis and gallbladder problems. In people with type 2 diabetes and existing diabetic eye disease, rapid improvement in blood sugar has been associated with a temporary worsening of retinopathy, so eye screening should be kept up to date.
For more detail, see our guide to weight loss injection side effects.
Are the pens the same?
Both are pre-filled, multi-dose pens designed for once-weekly use, and both are injected under the skin of the abdomen, thigh or upper arm.
However, they are different devices with different dose settings and are not interchangeable.
You should never try to use an Ozempic pen to deliver a Wegovy dose, or the other way round, by counting clicks or injecting multiple times. This is inaccurate and unsafe.
For technique, see how to inject Mounjaro or Wegovy.
Can you switch from Ozempic to Wegovy?
This depends on why you are taking Ozempic.
If you have type 2 diabetes
Your Ozempic is part of your diabetes treatment. Any change should be made by your GP or diabetes team, who will consider your blood sugar control, other medicines and overall health.
Wegovy can be prescribed to people with type 2 diabetes for weight management, but you should not take both together, and your other diabetes medicines may need adjusting.
If you were prescribed Ozempic privately for weight loss
Speak to a prescriber about moving to a medicine licensed for weight management. Because the active ingredient is the same, a move to Wegovy is usually straightforward, with the dose chosen according to what you have been taking and how you have tolerated it.
See our guide to switching between Wegovy and Mounjaro for how changes between weight loss medicines are planned.
What about Rybelsus and Wegovy tablets?
Semaglutide also comes in tablet form.
- Rybelsus is a daily semaglutide tablet licensed for type 2 diabetes.
- Wegovy tablets are a daily oral semaglutide option for weight management.
The same principle applies: same active ingredient, different licences and doses.
Read more in Wegovy tablets vs Mounjaro.
Where does Mounjaro fit in?
Mounjaro contains a different medicine, tirzepatide, made by a different company, Eli Lilly.
Tirzepatide acts on two hormone pathways, GLP-1 and GIP, whereas semaglutide acts on GLP-1 only.
Unlike semaglutide, tirzepatide is sold under one brand name in the UK for both uses. Mounjaro is licensed for type 2 diabetes and for weight management.
In a head-to-head trial in people with obesity, tirzepatide produced greater average weight loss than semaglutide: around 20% compared with around 14% over 72 weeks.
Compare them in our article: Is Mounjaro better than Wegovy? You can also read our Mounjaro dosage guide.
Ozempic vs Wegovy vs Mounjaro: a quick summary
Ozempic
- Semaglutide
- Type 2 diabetes
- Up to 2 mg weekly
Wegovy
- Semaglutide
- Weight management and cardiovascular risk reduction
- 2.4 mg weekly maintenance dose, with a higher dose for some adults
Mounjaro
- Tirzepatide
- Type 2 diabetes and weight management
- Up to 15 mg weekly
Which one is right for you?
- If you have type 2 diabetes, your GP or diabetes team will advise which medicine is appropriate. This may be Ozempic, Mounjaro or another option.
- If you want help with weight management and meet the criteria, the licensed injectable options are Wegovy and Mounjaro.
- If you have both, your treatment should be coordinated so that your diabetes care and weight management work together.
The choice between Wegovy and Mounjaro depends on your medical history, goals, how you tolerate each medicine, and cost. A prescriber can help you decide.
Getting treatment through SynovaMed
SynovaMed provides Wegovy and Mounjaro for weight management, following an online consultation and review by our clinical team.
To find out more, visit our weight loss programme, read our overview of injections for weight loss in 2026, or contact our team.
Frequently Asked Questions
Is Ozempic the same as Wegovy?
They contain the same active ingredient, semaglutide, but they are licensed for different uses and come in different doses.
What is the main difference between Ozempic and Wegovy?
Ozempic is licensed for type 2 diabetes at doses up to 2 mg. Wegovy is licensed for weight management at a maintenance dose of 2.4 mg.
Can I get Ozempic for weight loss in the UK?
Ozempic is not licensed for weight loss in the UK. Wegovy and Mounjaro are the licensed injectable options for weight management.
Is Wegovy stronger than Ozempic?
The medicine is the same, but Wegovy is given at a higher dose, which produces greater average weight loss.
Which is better for weight loss, Ozempic or Wegovy?
Wegovy. It was specifically studied and licensed for weight management at a higher dose.
Can I use Ozempic and Wegovy together?
No. They contain the same medicine and must not be used together.
Can I switch from Ozempic to Wegovy?
Yes, with a prescriber's guidance. If you have type 2 diabetes, speak to your GP or diabetes team first.
Are Ozempic and Wegovy side effects the same?
Yes, broadly, because both contain semaglutide. Side effects may be more noticeable at higher doses.
Is Ozempic available on the NHS?
Yes, for type 2 diabetes. It is not prescribed on the NHS for weight loss.
Is Mounjaro the same as Ozempic?
No. Mounjaro contains tirzepatide, a different medicine that acts on both GLP-1 and GIP receptors.
Why does everyone call weight loss injections "Ozempic"?
Ozempic was the first of these medicines to become widely known, and the name is often used loosely in the media. In the UK, the semaglutide product licensed for weight loss is Wegovy.
The bottom line: Ozempic vs Wegovy
Ozempic and Wegovy are the same medicine, semaglutide, licensed for different purposes at different doses.
Ozempic is for type 2 diabetes, up to 2 mg a week.
Wegovy is for weight management, at 2.4 mg a week.
Ozempic is not licensed for weight loss in the UK.
The pens are not interchangeable, and the two should never be used together.
For weight management, the licensed injectable options are Wegovy and Mounjaro.
Always obtain these medicines through a registered pharmacy, on prescription.
If you are unsure which treatment is right for you, a qualified prescriber can review your health, your goals and your options.
Medical Disclaimer
This article is intended for general educational purposes and does not replace personalised medical advice, diagnosis or treatment. Ozempic, Wegovy and Mounjaro are prescription-only medicines and are not suitable for everyone. Licences, doses, NHS criteria and availability can change. If you have type 2 diabetes, do not change or stop any of your medicines without speaking to your GP or diabetes team. The trial figures quoted are averages and do not predict individual results.