Wegovy pen colours: what the colour-coding actually tells you

The myth that the colours are just branding

A common assumption is that the different colours on Wegovy pens are a cosmetic choice, similar to the colour-ways you see on consumer products. They are not. Novo Nordisk colour-codes each dose strength deliberately as a medication safety measure. The rationale is straightforward: patients titrate through five dose steps over the course of their treatment, and having five visually distinct pens reduces the chance of accidentally injecting the wrong strength. The NHS semaglutide page reinforces that patients should always check the label before each injection, and the colour is one of the quickest checks available.

The coding also helps carers, pharmacists and clinical teams quickly confirm which pen a patient is using during a review. So while the colours look neat, their job is functional. If the pen you receive looks different from what you expected, that is worth querying before you inject.

One thing the colour does not confirm is whether that dose is appropriate for you at that moment. A prescriber decides when you move up the schedule; the pen's colour only tells you what is inside it.

What colour corresponds to which Wegovy dose

The Wegovy titration schedule runs through five doses: 0.25 mg, 0.5 mg, 1 mg, 1.7 mg and 2.4 mg. Each has its own colour. The exact shade names used by Novo Nordisk are detailed in the patient information leaflet that comes with every pen, the definitive reference is always the leaflet inside the box, not a third-party description. Broadly, the pens move from lighter tones at the lower doses to progressively deeper tones at the higher ones, making it straightforward to check you are holding the right pen for your current stage.

The 0.25 mg pen is the starting strength, used for the first four weeks to allow your system to adjust, and if you are sourcing that first pen you can find details on our Wegovy 1 pen page covering what to expect from that format. From there, the prescriber typically steps the dose upward every four weeks if tolerability is good, with the 2.4 mg pen representing the standard maintenance dose. The higher 7.2 mg maintenance dose, approved by the MHRA in January 2026 and as a dedicated single-dose pen on 14 April 2026, has its own distinct presentation, check the full Wegovy pen guide for specifics on that format.

If you want to look up the exact colour descriptions in clinical language, the summary of product characteristics is published on the Electronic Medicines Compendium, where the Wegovy SmPC lists each pen's appearance.

Spotting a pen that might not be genuine

The MHRA has repeatedly warned the public about counterfeit weight-loss pens circulating through unofficial online sellers and social media. Fake pens have reached people without going through the licensed UK supply chain, and in some cases the contents have been something other than what the label claimed. Colour-coding on counterfeits has not been reliably reproduced, shades have been off, label printing has varied, and in some cases pen mechanisms have differed from the genuine article.

The safe checks are practical ones. Verify that your pharmacy appears on the GPhC pharmacy register before ordering. A legitimate supply arrives with a full patient information leaflet in English, an expiry date, a batch number, and pen markings that match the leaflet's description precisely. If anything looks inconsistent (a shade that seems off, a label that feels different, a cap that doesn't seat properly) do not inject and contact your prescriber or pharmacist. You can also flag suspect products to the MHRA at Yellow Card.

It is also worth knowing that injecting a cold pen can affect how comfortable the injection feels. Our page on injecting Wegovy cold covers the practicalities of pen temperature and storage.

Storing your pens so the colour-coding stays meaningful

Colour-coding only works as a safety check if the pens are stored correctly and remain identifiable. Wegovy pens are refrigerated at 2–8°C before first use; the patient information leaflet sets out the limited room-temperature window after that. Store them in the original packaging so the colour-coded label stays intact and readable. If pens from different doses are in the house at the same time (during a transition from one strength to the next) keep them in separate, clearly labelled areas.

If you are curious about the volume of semaglutide each pen contains alongside the dose, this page on Wegovy pen volumes breaks that down. And if you are comparing Wegovy's design to the pens used for other semaglutide products, it is worth knowing that Ozempic is a different licence entirely, intended for type 2 diabetes, not weight management, and its pen presentation differs accordingly.

If you are considering starting Wegovy and want to understand whether it suits your situation, a free consultation with a prescriber from our team is the right first step. Speak to our prescribers, a real clinician reviews your answers the same day, not software.