How to inject Wegovy, step by calm step

What this guide covers

Wegovy (semaglutide 2.4 mg) comes as a single-dose, prefilled pen you press against the skin rather than a dial-a-dose pen. Here is how to use it, where to inject, how to rotate sites, and the small snags nobody warns you about. This is patient education, not a substitute for the prescriber who knows your case. Generic names sit next to brand names throughout: semaglutide (Ozempic, Wegovy), tirzepatide (Mounjaro, Zepbound).

Key points

• The Wegovy pen is a single-dose pen, not a dial-a-dose one. The first thing to understand is that the Wegovy (semaglutide 2.4 mg) pen works differently from the Ozempic pen many people picture. Ozempic uses one multi-dose pen that you dial and reuse for several weeks. Wegovy comes as a single-dose, prefilled, disposable auto-injector: one pen holds one week's dose, you use it once, and you throw it away. There is no dialing and no dose to set, because the dose is fixed inside the pen you were given. That also means each titration step, as your prescriber steps you up through the schedule, comes as a different-strength pen rather than a different number you turn. Knowing this removes most of the early confusion, since the instructions that apply to a reusable pen simply do not apply here.
• The three injection sites: belly, thigh, upper arm. Wegovy is a subcutaneous injection, meaning it goes into the layer of fat just under the skin, not into muscle or vein. The FDA Instructions for Use name three body regions: the abdomen, the front of the thigh, and the upper arm. On the belly, stay at least two inches (about five centimeters) clear of the navel. On the thigh, use the fleshy front-outer part rather than the inner thigh or over the kneecap. The upper arm works well but is the hardest to reach yourself, so many people save it for when someone else can help. All three regions deliver the drug equally well, so the choice between them comes down to comfort and reach. What you should not do is inject into skin that is tender, bruised, red, or hard.
• Working the pen, step by step. The mechanics are more forgiving than they look. Take the pen from the fridge and check the medicine through the window: it should be clear and colorless, and you can let a cold pen sit out briefly if a chilly injection stings. Wash your hands, then pull the cap straight off only when you are ready to inject, never before. Place the flat yellow end firmly against your chosen spot at a right angle to the skin, then press and hold. You will hear a first click as the injection starts and a second click when it finishes; keep the pen pressed to the skin, usually for the count of several seconds the leaflet specifies, until the medicine window turns fully yellow, which is how you know the whole dose has gone in. Lift the pen straight off, and dispose of the whole pen in a sharps container, never loose in the household bin.
• Rotating sites, timing, and a missed dose. Wegovy is a once-weekly injection you can take any day, at any time of day, with or without food. Pick a set day and, importantly, rotate where you inject: choose a different spot each week, keeping new injections clear of the last one, because repeatedly using the same patch of skin can cause lipohypertrophy, the firm fatty lumps that make absorption erratic. You can stay within one region, like the belly, and simply move around it. If you miss a dose, the general leaflet guidance is to take it as soon as you can if your next scheduled dose is more than two days (48 hours) away, and otherwise to skip it and resume on your regular day, never doubling up; confirm the exact window for your pen with your pharmacist. Changing your injection day is allowed as long as your last two doses were at least a set number of days apart.
• The small snags, and when to call. A few things routinely rattle new users and mostly should not. A dot of blood or a small bruise after injecting is common and not a problem. A tiny air bubble is not something you manage yourself with this device, since it is a sealed single-dose pen with no priming step. If you lift the pen too soon, before the window is fully yellow, you may not have delivered the full dose; do not reinject with a second pen to make up for it, and call your pharmacist to ask what to do. What does warrant a prompt call is a pen that will not click or seems not to have released, a needle you are worried stuck you before you were ready, or a large hot red area that spreads rather than settling over a day or two. And if you are simply unsure your technique is right, a pharmacist or nurse can watch you do it once, which resolves most worries in a single visit.

Frequently asked questions