Ozempic is the brand name for semaglutide, a prescription-only medication that belongs to a group of drugs called GLP-1 receptor agonists. In the UK, Ozempic is licensed for the treatment of type 2 diabetes, where it is used alongside diet and lifestyle measures to help improve blood sugar control over time.

GLP-1 receptor agonists work by mimicking a naturally occurring hormone (glucagon-like peptide-1) that helps regulate blood sugar levels. Ozempic supports blood sugar control in several ways:

• increasing insulin release when blood sugar levels are high
• reducing the amount of sugar released by the liver
• slowing how quickly the stomach empties after eating
• reducing appetite as a secondary effect

Ozempic is not licensed for weight loss in the UK. However, semaglutide is approved for weight management under a different brand name, Wegovy, which is prescribed at different doses and follows a separate dosing schedule.

➤ Read about the best Ozempic alternatives for weight loss.

Ozempic is supplied in pre-filled injection pens that deliver fixed doses of semaglutide. The dose cannot be adjusted per injection – instead, dose changes happen by moving to a different pen strength.

Ozempic pens are available in the following weekly doses:

The standard starting dose of Ozempic is 0.25mg once weekly for 4 weeks. This starting dose is used to help the body adjust to semaglutide and reduce the likelihood of side effects, particularly nausea and vomiting.

It’s important to understand that:

• 0.25mg is not intended to significantly lower blood sugar
• it is not considered a therapeutic dose
• it is a titration dose, used for safety rather than effectiveness

For the treatment of type 2 diabetes, the maximum licensed dose of Ozempic is 2mg once weekly. However, not everyone will need to reach this dose, and some people may not tolerate it. Dose increases must always be doctor-directed, based on blood sugar response, and balanced against any side effects.

There is often confusion online between Ozempic and Wegovy dosing. Higher semaglutide doses are frequently discussed in the context of weight loss, but these apply to Wegovy, which is licensed differently and at higher maintenance doses. They do not apply to Ozempic’s UK licence for type 2 diabetes.

Trying to adjust your dose yourself or following non-medical advice can increase the risk of side effects, including:

• severe gastrointestinal symptoms such as nausea and vomiting
• dehydration
• hypoglycaemia (low blood sugar), particularly if Ozempic is used alongside other diabetes medications

Dose increases are usually considered after you’ve been on the same dose for around 4 weeks, giving your body time to adjust and allowing your doctor to review how well the medication is managing your blood sugar levels. This review looks at factors such as blood sugar readings, side effects, and how consistently you’re using Ozempic alongside diet and lifestyle measures.

If side effects are ongoing or difficult to manage, your doctor may recommend staying on your current dose for longer before increasing or adjusting your treatment plan. Regular medical review is important, as dose changes should always be tailored to your individual response rather than following a fixed schedule.

The table shows a typical example of how Ozempic doses may be increased over time. This is not prescriptive and should not replace medical advice:

Ozempic is taken once weekly, on the same day each week. You can inject it at any time of day, and it does not need to be taken with food. Choosing a regular injection day can help make treatment easier to remember and reduce the chance of missed doses.

If needed, you can change your injection day, as long as it has been at least 3 days (72 hours) since your last dose. After switching, you should continue injecting once weekly on the new chosen day.

Ozempic is injected just under the skin. Common injection sites include the abdomen (stomach area), thigh, or upper arm. Injection sites should be rotated each week to help reduce skin irritation.

Before using your Ozempic pen for the first time, it’s important to read the patient information leaflet included with your medication.

To inject Ozempic:

1. Check that the solution in the pen window is clear and colourless.
2. Wash your hands thoroughly.
3. Attach a new needle.
4. If using a new pen, check the flow as instructed in the leaflet.
5. Set the dose using the dose selector (only if advised by your doctor).
6. Remove the inner needle cap.
7. Insert the needle into your chosen injection site.
8. Press and hold the dose button until the counter returns to 0, then keep the needle in place for at least 6 seconds.
9. Remove the pen from your skin.
10. Dispose of the needle safely in a sharps container and replace the pen cap before storing.

Each Ozempic pen delivers a fixed weekly dose, based on the strength prescribed. Most pens contain several weekly doses, so a single pen usually lasts a few weeks. The exact number of doses depends on the pen strength and your prescribed dose.

The dose is not adjusted by counting clicks – instead, any dose change is made by switching to a different pen strength under medical guidance. Always check the pen label and follow the instructions provided. If you’re unsure how many doses remain or when to start a new pen, a pharmacist or doctor can advise you.

Yes. Side effects with Ozempic are dose-dependent and are most likely to occur when starting treatment or when the dose is increased. Common side effects affecting around 1 in 10 people include:

• nausea (feeling sick)
• diarrhoea
• vomiting (being sick)
• constipation
• fatigue or feeling tired

These side effects often peak during dose increases and usually improve over time as the body adjusts to Ozempic. This is why doses are increased gradually. If side effects are difficult to manage, your doctor may recommend:

• staying on the same dose for longer
• delaying or avoiding a dose increase
• reducing the dose
• stopping treatment if side effects are severe or persistent

Although uncommon, Ozempic can cause serious side effects that need medical attention. If you have any of these symptoms, particularly trouble breathing or severe abdominal pain, call 999 immediately or go to A&E.

• severe and persistent abdominal pain, which may be a sign of pancreatitis
• signs of dehydration, such as dizziness, dark urine, reduced urination, or extreme thirst
• severe allergic reactions, including swelling of the face, lips, or throat
• worsening vision in people with diabetic eye disease

You should get medical advice if:

• side effects are severe, persistent, or worsening
• you experience repeated vomiting or diarrhoea
• you notice signs of dehydration
• your blood sugar control worsens
• you have concerns about how the medication is affecting you

If you miss a dose of Ozempic, try not to worry – this is a common situation, and it can usually be managed safely.

What you should do depends on how much time has passed since your scheduled injection day:

• if fewer than 5 days have passed, take the missed dose as soon as you remember, then continue with your next dose on your usual weekly day
• if more than 5 days have passed, skip the missed dose and take your next dose on your normal injection day – do not try to “catch up” by taking extra doses

If you miss doses frequently, it may help to:

• choose a consistent day of the week that fits your routine
• set a reminder on your phone or calendar
• link your injection day to a regular weekly habit

If you are unsure what to do after missing a dose, or if missing doses are affecting your blood sugar control, speak to your GP or online doctor for advice.

If you miss doses frequently, it may help to:

• choose a consistent day of the week that fits your routine
• set a reminder on your phone or calendar
• link your injection day to a regular weekly habit

If you are unsure what to do after missing a dose, or if missing doses are affecting your blood sugar control, speak to your GP or online doctor for advice.

Ozempic and Wegovy both contain semaglutide, but they are licensed for different conditions and follow different dose schedules. In the UK, Ozempic is licensed for type 2 diabetes, while Wegovy is licensed specifically for weight management. Because of this, the doses used, how quickly they are increased, and the maximum dose reached are not the same.

The key difference is the dose range over time. Wegovy is gradually increased to a higher long-term dose than Ozempic, reflecting its separate licence and the clinical trials that studied semaglutide for obesity. Weight loss studies showing substantial results used Wegovy-range doses (up to 7.2mg weekly), not the lower doses licensed for diabetes treatment with Ozempic.

Even though both medications contain semaglutide, Ozempic dosing should always stay within its licensed range and be guided by a healthcare professional.

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Ozempic dosing, Novo Nordisk [accessed 09 January 2026]

Semaglutide, BNF [accessed 09 January 2026]

Once-Weekly Semaglutide in Adults with Overweight or Obesity, New England Journal of Medicine [accessed 09 January 2026]

Guide to HbA1c, Diabetes UK [accessed 09 January 2026]

Wegovy 0.25 mg solution for injection in pre-filled pen, emc [accessed 09 January 2026]