How to Take a Wegovy Shot: Technique, Timing and Sites That Actually Work

What the official guidance says about injection technique, and why it matters

The NHS patient-level guidance for semaglutide confirms that Wegovy is given as a subcutaneous injection: into the fatty tissue just under the skin, not into a vein or muscle. That distinction matters because intramuscular injection changes the absorption profile and increases pain and bruising risk. The approved sites are the abdomen (keeping at least a few centimetres from the navel), the front or outer thigh, and the back of the upper arm. You can read the full technique detail in NHS guidance on semaglutide, which is written specifically for patients using the injection at home.

Rotating your injection site is not optional advice. Using exactly the same point of skin week after week leads to lipohypertrophy, a hardening of fatty tissue that slows absorption unpredictably. Move a few centimetres around the same general area each time. If you use the abdomen one week, you can use the thigh the next; if you stay with the abdomen, work around it in a rough clockwise pattern. A useful way to track this, which our prescribers sometimes suggest, is to note the site in your phone's calendar alongside your injection day.

Before injecting, clean the chosen area with an alcohol swab and let it dry fully, injecting into wet skin stings more. Then pinch a small fold of skin gently, insert the needle at roughly 90 degrees if using a standard-length needle (or at 45 degrees for very lean sites), press the button until the window turns red, and hold the pen in place for a slow count of ten. Releasing too early is the single most common cause of incomplete dosing.

Choosing and sticking to your injection day

Pick a day of the week that you can reliably return to. Most people find a day with low disruption works best, Sunday evening before the working week, or Saturday morning before the weekend's rhythm kicks in. If you travel for work, factor in that the pen needs refrigeration; a day before a regular trip can create problems. That said, Wegovy can be kept at room temperature for a limited period as described in the Patient Information Leaflet, so short trips are manageable with some forward planning.

One practical note: if you order on a Monday before noon, your treatment advice from your prescriber and your pen can both be with you the next working day. That kind of predictability makes it easier to plan which day becomes your injection day. You can shift your chosen day by a day or two if needed (so if your usual Wednesday is suddenly impossible because of a work event, Thursday is fine) but try to keep at least 72 hours between shots. Going too early, not too late, is the more common mistake when people experiment with timing.

If you miss a dose entirely, the approach is different from simply taking it late. What to do after a missed Wegovy shot depends on how many days have passed, your prescriber and the PIL cover this clearly, and it is never something to guess at.

Storage, the pen itself, and used-sharps disposal

Wegovy pens are stored in the fridge at 2–8°C, typically in the door, though check your PIL for the exact parameters, since conditions at the door vary. The pen should never be frozen; if it has been, do not use it. When you are ready to inject, take the pen out of the fridge and let it come up to room temperature for around 15–30 minutes. Cold injections are significantly more uncomfortable and can cause local reactions.

Each Wegovy pen is pre-set at manufacture to your prescribed dose. There is no dial to turn, no cartridge to load. You remove the cap, check the window for the correct colour indicator and that the liquid is clear and colourless, attach a needle if your device requires one, and follow the steps above. If anything looks different (cloudy, discoloured, particles floating) do not use that pen and contact your pharmacy.

Used pens and needles go into an approved sharps container, not the household bin. A 1-litre sharps bin is what most people on weekly injections use; once full, your local council or pharmacy can advise on collection. Never recap a used needle by hand. The full process for injecting semaglutide safely, including disposal steps, is covered in detail at our semaglutide injection guide.

Side effects to expect around injection day, and when to act

The most frequently reported side effects of Wegovy (nausea, loose stools, fatigue, a reduced appetite that goes beyond the intended effect) cluster in the first day or two after an injection, particularly after starting or after a dose step up. The STEP 1 trial, published in the New England Journal of Medicine, recorded gastrointestinal effects as the most common adverse events; they were typically mild to moderate and transient, resolving as participants' bodies adjusted. Planning your injection day so that any nausea falls on days when your schedule is lighter is a small but genuine quality-of-life choice.

On the serious-but-rare side, the MHRA has flagged acute pancreatitis as an infrequent but significant risk with GLP-1 medicines: severe stomach pain that extends to the back, with or without vomiting, needs urgent medical attention rather than a wait-and-see approach. Gallbladder symptoms, allergic reactions (swelling of the face or throat, breathing difficulty), and signs of dehydration from persistent vomiting are also reasons to seek help promptly rather than push through to your next scheduled call. The MHRA's Yellow Card scheme allows patients to report side effects directly, which contributes to the ongoing safety monitoring of newer medicines like Wegovy. If you have questions about a reaction between appointments, our aftercare team is available seven days a week. For a fuller picture of what the injection schedule looks like across doses and what to expect at each stage, our detailed injection walkthrough goes through each step with additional context. You can also explore pen pictures and visual guides if you find it helpful to see the device before your first dose arrives.