Using your Wegovy pen for the second time: what changes, what stays the same

The moment before you start: checking the pen is still good to use

You grabbed the pen from the fridge door this morning, and it feels routine. Pause for thirty seconds anyway. Check the expiry date printed on the label, then hold the pen up to the light and look through the inspection window. The liquid should be clear and colourless or faintly yellow; discard the pen and contact your prescriber if you see particles, cloudiness or discolouration. If the pen has been left at room temperature, check the patient information leaflet for how long that is acceptable, the window is finite and specific to this medicine, so the leaflet is the definitive reference, not a general estimate.

Once you are satisfied the pen is fine, let it reach room temperature if it came straight from the fridge. Injecting cold liquid is not dangerous, but it can be more uncomfortable. Some people simply leave it on the counter for fifteen to twenty minutes while they have breakfast. Then wash your hands thoroughly with soap and water before touching the pen again.

Gather what you need: the pen, a fresh needle if your pen requires one (check your specific device instructions), and a clean alcohol swab. If any part of the process still feels unfamiliar, our guide to using Wegovy for the first time is worth a quick read before you begin, and having a full refresher on Wegovy pen technique open on your phone the first few times is entirely sensible.

Choosing your injection site on the second use

Site rotation is the detail most people underestimate the first time. Injecting into exactly the same spot week after week can cause lipohypertrophy, a thickening of the fat tissue that slows absorption and makes the injection itself lumpy and unpredictable. By your second injection, you should be moving to a different area entirely, not just a centimetre away.

The three licensed sites are the abdomen (at least 5 cm away from your navel), the front of the thigh, and the outer upper arm. If you used the left side of your abdomen first time, right abdomen or thigh are both sensible choices now. Some people keep a simple note on their phone logging which site they used each week; it takes ten seconds and removes any guesswork.

Clean the chosen skin with an alcohol swab and let it dry fully before injecting, damp skin stings more than dry skin. Pinch the skin if you are lean in that area, insert the needle at a 90-degree angle, press the injection button firmly, and hold it in place for the full count that your device instructions specify. You will hear or feel a click. Keep holding until the yellow indicator confirms the dose is complete. The detailed Wegovy pen usage guide covers these steps with more device-specific context.

After the injection: disposal and what to expect

Once the dose is complete, remove the pen from your skin without bending or recapping the needle. Place the used needle directly into a suitable sharps container, household bins are not appropriate for used needles, and most local councils provide free sharps disposal through GP surgeries or pharmacies. The pen body itself is clinical waste; your patient information leaflet or pharmacy will advise on local disposal routes.

Side effects after a second injection are worth knowing about. Nausea, loose stools, burping and fatigue are the most reported. For many people, these are milder by the second week than the first, because the body has begun adapting. They are still most likely in the day or two immediately after the injection. If you experience severe, persistent stomach pain that spreads towards your back (with or without vomiting) seek urgent medical attention; this pattern can indicate pancreatitis, which the MHRA has identified as an infrequent but serious risk with GLP-1 medicines. The MHRA's Yellow Card scheme is the right place to report any suspected side effects, and your prescriber should always know if something concerns you.

For practical advice on timing (which day of the week works best and whether the time of day matters) the guide on the best time to inject Wegovy covers the evidence and practical trade-offs in detail.

When your dose changes and why the second injection at a new strength feels different

If your second injection coincides with a dose increase (prescribed by your clinician, not self-directed) treat it with the same care as a first injection. A higher dose means the side-effect profile can temporarily ramp back up, similar to week one. The titration schedule exists to minimise this; the plan your prescriber has set is paced to give your system time to adjust before each step.

Dose increases are decided by your prescriber after reviewing how you have tolerated the previous level. If you are uncertain whether a change is due, check your prescription and speak to your clinical team. Never adjust the dose yourself. More background on how Wegovy fits into a broader weight-management approach is on the Wegovy information page, and if cost is a consideration as treatment continues, the Wegovy cost page sets out what private prescriptions typically involve.

Wegovy is a prescription-only medicine. If you are not yet on treatment and are considering whether it might be right for you, check your eligibility through a free consultation with our prescribers.