How Wegovy Is Injected: What to Expect Each Week

Where exactly does the injection go?

Wegovy is injected subcutaneously, not into a vein, not into muscle. That means the needle tip sits in the soft layer of fat just under the skin, which is both accessible and relatively insensitive to pain. The three licensed sites are the abdomen (at least five centimetres from the navel), the front of the thigh, and the outer area of the upper arm.

Each site works equally well clinically. The abdomen tends to be the easiest to reach on your own. Injecting Wegovy in the thigh is a popular choice for people who find the stomach uncomfortable, particularly during dose increases when nausea can make the abdomen feel tender. The upper arm is the trickiest to self-administer and is more practical with a second person helping.

Rotation matters. Reusing the same small patch of skin week after week can lead to lipohypertrophy, a lumpy, hardened area of tissue that absorbs the medicine unevenly. Pick a slightly different spot within the same region each time. A simple mental map or a note on your phone makes this easy to track.

Injection sites should be free of broken skin, bruising, or scarring. If you are curious about the full Wegovy injection process from unwrapping the pen to aftercare, that page covers every stage in detail.

How does the pen itself work?

The Wegovy pen comes pre-filled with your current dose. Nothing is drawn up, nothing is mixed. You remove the pen cap, attach a new needle if required by your device instructions, and follow the steps in the Patient Information Leaflet that comes in the box. The prescriber or pharmacist team will confirm which pen format you have, since the 7.2mg pen approved by the MHRA in April 2026 has an auto-dosing mechanism with a built-in covered needle that locks after use, slightly different from the earlier format.

Before injecting, the skin area can be cleaned. Alcohol swabs are often used for this, though the PIL for your specific product gives the definitive instruction. Press the pen firmly against the skin until it clicks, hold for the count specified in the leaflet, then withdraw. That is the injection done for the week.

If you are ever unsure whether the dose delivered fully, the page on confirming the dose went in explains the signs to check and what to do if you are not certain. If you believe you have made an error with the technique, our page on what to do after a wrong injection is worth reading before calling the pharmacy.

What happens to the used pen and needle?

Used needles are sharps and should never go into household rubbish. A small sharps container takes up minimal space and keeps disposal safe and legal. Most local councils in England offer a collection or exchange scheme for sealed sharps bins, your GP surgery can usually advise on the nearest drop-off point.

Storage matters too. Wegovy should be kept refrigerated between 2°C and 8°C. There is a limited window during which a pen can be kept at room temperature if needed for travel or convenience, the exact duration is stated in your Patient Information Leaflet, and that leaflet is the authority on this, not a general summary. The Wegovy SmPC on the electronic Medicines Compendium (eMC) holds the full prescribing information if you want the technical detail.

Wegovy is given once a week, on the same chosen day each week. For the specifics of timing, flexibility around missed or delayed doses, and whether the day can shift, the page on how often Wegovy is injected covers those questions properly. Dose timing is a clinical matter, if you are unsure, speak to your prescriber rather than adjusting independently.

Are there side effects linked to the injection itself?

Most of Wegovy's side effects are gastrointestinal rather than injection-related: nausea, loose stools, indigestion and bloating are the most commonly reported, tending to be most noticeable after a dose increase and fading over the following days. These are covered in detail across Wegovy's clinical literature and the NHS guidance. The injection site itself occasionally causes temporary redness, a small lump, or mild itching, rotating sites each week significantly reduces this.

If you notice prolonged or worsening pain at an injection site, or any sign of a systemic reaction, contact your prescriber. Severe, persistent abdominal pain that spreads toward the back is a reason to seek urgent medical attention, it can, in rare cases, indicate acute pancreatitis, which the MHRA has highlighted in guidance on GLP-1 medicines. Any suspected side effect can be reported through the MHRA Yellow Card scheme.

Semaglutide, which is the medicine in Wegovy, is also found in Ozempic, though that product is licensed for type 2 diabetes, not weight loss. The page on weight-loss injections and Ozempic explains the distinction clearly if you have seen it mentioned elsewhere.

If you are thinking about starting Wegovy and want to understand the full picture before your consultation, the weight-loss treatments page is the right place to begin. A GPhC-registered prescriber at our pharmacy will review your consultation the same day it is submitted.