A guide to the different Wegovy pens available in the UK

The myth: every Wegovy pen is essentially the same device at a different fill level

This is the assumption that trips people up most often. Because all the pens carry the same active ingredient, semaglutide, and look broadly similar in packaging, it is tempting to treat them as one product in different sizes. In practice, the pen you receive at week one and the pen you might use at month eighteen have different mechanical designs, different needle exposure systems and, with the 7.2 mg version, a completely different injector architecture. Getting familiar with the specific device in your hand matters, and the Patient Information Leaflet included with each box is the authoritative source for how that particular pen operates.

There is also genuine confusion about Ozempic, which contains semaglutide at lower doses and uses a multi-dose reusable pen requiring separate needles. Ozempic is licensed for type 2 diabetes, not weight loss. The Wegovy pens are single-use, dose-fixed devices, and the two should never be conflated.

If you have ever received a pen that looked unfamiliar in your hand, you are not alone. It is one of the questions our prescribers hear most weeks from patients transferring from another provider or moving up the dose ladder.

The five standard Wegovy pens and how the titration sequence works

The standard Wegovy titration uses five pre-filled, single-use pens: 0.25 mg, 0.5 mg, 1.0 mg, 1.7 mg and 2.4 mg. Treatment begins at 0.25 mg, a starting dose designed to let your body adjust to semaglutide before the therapeutic dose is reached. Each level is typically held for around four weeks before your prescriber considers moving you to the next, based on tolerability. The NHS semaglutide medicines page provides a clear patient-level overview of this schedule.

Each pen in this sequence is a fixed-dose, single-use injector. You press the device against the skin at your chosen site, activate the mechanism, and the needle inserts, delivers the dose and retracts automatically. There is no dose dial to set and no cartridge to load. Once used, the pen locks permanently. Step-by-step guidance on using a Wegovy pen covers the injection process in detail, including how to confirm the dose has been delivered.

Injection site choices for the standard pens include the abdomen, the front of the thigh and the upper arm. Rotating between sites, and between different spots within each site, helps to prevent local skin changes over time. For more on whether your chosen site actually affects how well the medicine works, the detail is worth reading separately. Whether the injection site makes a measurable difference is a question with a more nuanced answer than most people expect.

The 7.2 mg pen: what changed in April 2026

On 14 April 2026 the MHRA approved a dedicated single-dose 7.2 mg Wegovy pen, making the UK the first country to authorise this higher maintenance dose in a single pre-set device. Before this approval, patients moving to 7.2 mg had to administer three separate 2.4 mg pens each week, which was logistically demanding. The new pen delivers the full 7.2 mg in one weekly injection, using an auto-dosing mechanism with a covered, built-in needle that locks after use, as confirmed by the MHRA's announcement on GOV.UK.

There are two points worth noting about this pen. First, it is licensed only for adults with a BMI of 30 or above, and it is not authorised for the cardiovascular risk-reduction indication. Second, even patients starting fresh still begin at 0.25 mg and titrate upward; the 7.2 mg pen is a maintenance format reached after months of treatment, not an entry point. Specific dose availability is confirmed during your clinical assessment, rather than assumed from the outset.

For context on how the 7.2 mg results compare to other treatment options, the Wegovy treatment overview draws together the evidence in one place. Thinking about costs across the different pens? A fair comparison of what private treatment involves is worth reading before drawing conclusions. You can find a breakdown of where to get Wegovy and what to look for in a provider on a dedicated page.

Practical differences that matter day to day

Beyond the dose, there are practical differences between the pen formats that affect how you store and handle them. All Wegovy pens should be refrigerated at 2 to 8°C, but each comes with a limited window during which it can be kept at room temperature before use. The exact duration of that window differs between formats, and the SmPC for your specific pen, available via the electronic Medicines Compendium, is the only source to trust for that figure.

Used pens, like all sharps, need proper disposal. A rigid sharps bin is the safe option. Dropping a used pen into a household bin creates a needle-stick risk for waste handlers. If you need one, a 1-litre sharps container is available through our pharmacy.

The practical guide to using a Wegovy pen covers storage tips, what to check before injecting and what a normal injection should feel and sound like. Getting these basics right from the start prevents the small errors that can make treatment harder than it needs to be. If anything feels wrong at any point, our clinical team is available seven days a week. You can reach us through the contact page whenever you need support.

If you would like to discuss which pen or dose stage is right for your situation, speak to our prescribers through a free consultation.