GLP-1 Injection Site Rotation: Where to Inject and How to Rotate
Injection site rotation is a habit of changing where you inject each dose so you do not reuse the same spot. The instructions for Ozempic, Wegovy, Mounjaro and Zepbound list the stomach area, the thigh and the back of the upper arm (the arm only when someone else gives the injection). Novo Nordisk says to change the injection site with each injection and not reuse the same site. Lilly says to change it each week and allows the same area if you pick a different spot within it. Ask your prescriber which site is right for you.
Where can you inject a GLP-1?
In the stomach area, the thigh or the back of the upper arm, with the arm only when someone else gives the injection. Both makers of the common once-weekly GLP-1 injections list the same three body areas, with small differences in who may use which. This table summarizes the instructions for use that come with each medicine.
| Medicine | Sites listed | Rotation wording |
|---|---|---|
| Ozempic (Novo Nordisk) | Stomach area at least 2 inches from the belly button, thighs, back of upper arm (only with help from someone else) | "Change (rotate) your injection site with each injection. Do not use the same site for each injection." |
| Wegovy injection (Novo Nordisk) | Stomach area at least 2 inches from the belly button, thighs, back of upper arm (only with help from someone else) | "Change (rotate) your injection site with each injection." |
| Mounjaro (Lilly) | Stomach (abdomen) or thigh by you or another person; back of upper arm by another person | "Change (rotate) your injection site each week. You may use the same area of your body but be sure to choose a different injection site in that area." |
| Zepbound (Lilly) | Stomach (abdomen) or thigh by you or another person; back of upper arm by another person | Same wording as Mounjaro |
Wording taken from each product's instructions for use and Medication Guide. Check the version that came with your pen or syringe, because devices differ.
The prescribing information for both Ozempic and Zepbound also notes that similar exposure was achieved when the medicine was given in the abdomen, thigh or upper arm. That means the choice among these sites is mostly about comfort, reach and rotation. Your prescriber or pharmacist can tell you which site suits you.
Where should you not inject?
Do not inject into irritated or damaged skin, within 2 inches of the belly button, into muscle or a vein, or into a site you use for other medicines.
- Skin that is tender, bruised, red or hard. The Wegovy pen instructions say not to inject into these areas.
- Skin with pits, thickening or lumps, scars, or damaged skin. This is from Lilly's instructions for the vial.
- Within 2 inches of the belly button. Novo Nordisk's instructions say to keep that distance on the stomach.
- Muscle or a vein. Novo Nordisk's Medication Guide says these medicines go under the skin.
- The same site you use for other medicines. Lilly's instructions say not to inject into it.
Why rotate injection sites?
Rotating lowers your risk of skin changes such as pits, thickened skin or lumps at the injection sites. Novo Nordisk says only that you should not use the same site for each injection. Lilly's instructions give a reason: they say to rotate within the area you choose for each dose to reduce your risk of lipodystrophy (pits in skin or thickened skin) and localized cutaneous amyloidosis (skin with lumps) at the injection sites. If you see changes in the skin where you inject, tell your prescriber.
How do you rotate GLP-1 injection sites?
Both makers allow the stomach and thigh, so one workable plan is a repeating loop of four spots. This is an example, not a prescription, and your prescriber's guidance comes first.
| Dose | Spot |
|---|---|
| Week 1 | Stomach, left side |
| Week 2 | Right thigh |
| Week 3 | Stomach, right side |
| Week 4 | Left thigh |
Each time you come back to a spot, choose a different point inside it rather than the exact place you used last. Add the back of the upper arm only if someone else gives that injection, as both sets of instructions say. The plan only works if you know where the last shot went, so record the site every time.
What mistakes break a rotation?
Rotations break when you reuse the easy spot, forget the last site, inject too close to the belly button, or try the back of the arm on your own.
- Defaulting to the same easy spot every week because it is convenient.
- Forgetting where the last injection went, then guessing.
- Injecting too close to the belly button.
- Using the back of the arm alone, when both makers say another person should give that injection.
How Simple GLP helps
Simple GLP is a dose log for GLP-1 weekly shots and daily pills. When you log a shot you can record the injection site (abdomen, left or right thigh, left or right arm), and the Home screen shows where the last shot went, so you know which spot is next without relying on memory. You can leave the site as not recorded and edit entries later. The app does not tell you which site to use, does not suggest doses and is not medical advice. It keeps a log, and your prescriber and the instructions for your medicine decide the rest. Comparing apps? See the best GLP-1 tracker app comparison.
Log the site with every shot
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About Simple GLPFrequently asked questions
Where can I inject Ozempic or Wegovy?
The stomach area at least 2 inches from the belly button, the thighs, and the back of the upper arm, with the arm only when someone else gives the injection, according to Novo Nordisk's instructions. Your prescriber can help you choose the best site for you.
How often do I need to rotate injection sites?
Each time you inject. Novo Nordisk's instructions say to change your injection site with each injection and not use the same site each time. Lilly's instructions for Mounjaro and Zepbound say to change your injection site each week.
Can I inject in the same area every week?
Yes, if you choose a different spot within that area. Lilly says you may use the same area of your body as long as you choose a different injection site within that area. Novo Nordisk says to avoid using the exact same spot as last time.
Does the injection site change how well the medicine works?
Exposure is similar across sites: the prescribing information for Ozempic and Zepbound reports similar exposure after injection in the abdomen, thigh or upper arm. For anything about your own results, ask your prescriber.
What should I do if an injection site is bruised, red or hard?
Use a different spot. The Wegovy pen instructions say not to inject into skin that is tender, bruised, red or hard. If skin changes such as lumps or pits appear, tell your prescriber.
Is it better to inject GLP-1 in the thigh or stomach?
The labels do not favor one. Both makers list the stomach and the thigh, and the prescribing information for Ozempic and Zepbound reports similar exposure after injection in the abdomen, thigh or upper arm, so the choice is mostly about comfort, reach and keeping a rotation going. Follow your prescriber's advice and the instructions that came with your pen.
Sources
- Novo Nordisk: Ozempic prescribing information, Medication Guide and instructions for use
- Novo Nordisk: Wegovy prescribing information, Medication Guide and instructions for use
- Eli Lilly: Mounjaro prescribing information
- Eli Lilly: Zepbound prescribing information
- Eli Lilly: Zepbound instructions for use and Medication Guide
- Eli Lilly: Mounjaro instructions for use and Medication Guide
This page is general information, not medical advice. It summarizes manufacturer instructions and gives no dosing guidance. Follow the instructions that came with your medicine and talk to your prescriber or pharmacist. Simple GLP is an independent app and is not affiliated with Novo Nordisk or Eli Lilly.