GLP-1 Injection Sites — Stomach, Thigh, Arm and How to Rotate

You've got the pen in one hand and your shirt pulled up with the other, and you pause. Left side or right? Was last week the left? It's a small question, but it's the one the label actually asks you to get right every week.

Where can I inject a GLP-1?

The labels for the weekly GLP-1 injections we checked name the same three areas, all just under the skin:

Area	What the instructions say
Stomach (abdomen)	Wegovy pen and syringe instructions: at least 2 inches from your belly button
Thigh	Wegovy pen instructions: the front of the thigh
Upper arm	Zepbound label: another person should inject in the back of the upper arm. Wegovy syringe instructions say the same

These are subcutaneous injections, meaning into the layer just under the skin, not into a muscle or vein. Pens differ between brands, so follow the Instructions for Use that came with yours.

If you take a GLP-1 as a tablet, like the Wegovy pill, none of this applies — but the label has its own rules about taking it on an empty stomach, which are worth tracking just as carefully.

Does it matter which site I choose?

For semaglutide, the Wegovy label says similar levels in the body were reached whether it was injected in the abdomen, thigh or upper arm. It also says the site can be changed without needing a different dose.

So the choice mostly comes down to you. Some people find the stomach easiest to see and reach. Others prefer the thigh because it's simpler to do sitting down. The upper arm is usually a two-person job.

So what does rotating actually mean?

Both the Wegovy and Zepbound Medication Guides say to change your injection site with each injection. The Wegovy pen instructions add that you may inject in the same body area each week, as long as it isn't the same spot.

In practice, that might look like this over four weeks:

1. Stomach, left of the belly button
2. Stomach, right of the belly button
3. Front of the left thigh
4. Front of the right thigh

Then back to the start. You don't need a fixed pattern — you just need to know where you went last time so this week is somewhere different.

Are there places I should avoid?

The instructions point you to the areas above and away from the ring right around the belly button. Beyond that, the common-sense rule is to choose skin that looks and feels normal — not bruised, tender, red or scarred — and to skip a spot that's still sore from last time.

If a site stays painful, swollen or red, or you notice a lump that doesn't go away, mention it to your pharmacist or prescriber rather than working around it. They may want to check your technique or take a look.

Why is it so easy to lose track?

Because it's once a week, and a week is long enough to forget. Most people remember roughly where they injected; few remember which side. That's exactly the detail rotation depends on.

Writing it down takes five seconds and removes the guesswork. It also gives you something to point to if a site becomes irritated — you can see whether you've been coming back to the same patch.

What we'd track

1. The exact site each week. Area plus side, so next week's choice is obvious.
2. Any reaction at the site. Bruising, redness or soreness, and how many days it lasted. Patterns show up over a few weeks.
3. Which pen or strength you used. Useful when your dose changes and you're getting used to a new pen.
4. How you felt in the days after. The site rarely affects side effects, but noting both in one place helps rule things in or out.

Holt saves the site with every shot and suggests the next spot in your rotation — left arm, upper stomach, outer thigh and so on — so picking a different one takes a glance. Site reactions sit in the same log as your doses and side effects, so a sore patch or a repeated spot is easy to see.

Rotate your sites with Holt

If a site concern comes up at an appointment, the doctor-visit report shows your recent sites and any reactions you noted, so the conversation starts with facts.