How to Inject Semaglutide: Sites, Technique and What the Label Actually Says

Injection technique gets far less attention than dose and side effects, but doing it wrong is a real, preventable source of both discomfort and inconsistent absorption. Here is exactly what the FDA-approved instructions for use specify, plus what the broader injection-technique literature adds.

Where to inject

Per Wegovy's FDA prescribing information, semaglutide is injected subcutaneously — under the skin, never into a muscle or a vein — in one of three approved sites: the stomach (abdomen), the thigh, or the upper arm¹. All three are valid; which one you use on a given week is a rotation decision, not a fixed choice.

Rotate the site every time — this is not optional guidance

The label is direct on this point: "change (rotate) your injection site with each injection. Do not use the same site for each injection"¹. This isn't a minor suggestion. A comprehensive, evidence-based set of injection-technique recommendations — developed by an international panel for GLP-1 analogs and insulin alike — identifies site rotation as central to avoiding lipohypertrophy, a buildup of fatty tissue at repeatedly-injected sites that can itself impair how consistently the drug absorbs². In practice: pick a different spot within your chosen site region each week (for example, alternating quadrants of the abdomen, at least an inch from the last injection and away from the navel), and rotate between abdomen, thigh and upper arm over time rather than returning to the same few spots.

The weekly schedule and what a missed dose means

Semaglutide is dosed once weekly, on the same day each week, at any time of day, with or without food¹. If you need to shift your injection day, the label permits it as long as your last dose was at least 2 days earlier. If you miss a dose entirely: take it as soon as possible if the next scheduled dose is more than 2 days away; if it's less than 2 days away, skip the missed dose and resume your regular schedule rather than doubling up¹. Miss doses for 2 or more consecutive weeks, and the label specifically advises contacting your provider to discuss how to restart — a real recommendation, not overcaution, since your titration status may need reassessing after an extended gap. For the full week-by-week dose progression this schedule is layered onto, see the labeled titration schedule.

The pen itself is designed to be low-error

If you're nervous about self-injecting for the first time, the device engineering has actual usability data behind it. A formal human-factors usability study of the semaglutide single-dose pen-injector — testing 60 participants across patients with and without pen experience, plus healthcare professionals — found no potentially serious use errors across the simulated injection tasks, with mean ease-of-use ratings around 6.6–6.9 out of 7³. That doesn't replace the training your provider or pharmacy should walk you through on your first dose, but it's real evidence the device is built to be hard to get wrong.

What this means in practice

Rotate deliberately — pick your next site before you need it, not in the moment — inject on the same day each week, and don't let a missed-dose panic turn into doubling up; follow the specific make-up rule above instead. If you're comparing an injectable route against an oral option because needles are the sticking point, see oral semaglutide: Rybelsus, Ozempic tablets and the Wegovy pill for what the tablet alternatives actually are and aren't approved for. A verified provider's intake should also cover injection training directly — see how to choose a GLP-1 telehealth provider for what that should include. The technique guidance behind this is indexed in our research library. Not medical advice — see our medical disclaimer; get hands-on injection training from your provider or pharmacist before your first dose.