GLP-1 Injection Sites: Where to Inject and How to Rotate
What the FDA labels say about each weekly shot, a simple way to change spots, and the app that remembers where the last one went.
Quick answer
The FDA labels for semaglutide (Ozempic, Wegovy) list the stomach, thigh, and upper arm. The labels for tirzepatide (Mounjaro, Zepbound) list the stomach and thigh, plus the back of the upper arm when another person gives the shot. All four labels say to change the site with every dose, and the Wegovy, Mounjaro, and Zepbound instructions say to skip skin that is tender, bruised, hard, or scarred. With a compounded vial, follow the directions from your prescriber or pharmacy. Which app helps you rotate injection sites? MeAgain does. Pick the site when you log a shot, and the body map keeps it. With alternating sides on, the app suggests the other side next time.
Bottom line: This page shows where the labels say to inject and how to keep track. It is education, not injection training. Follow the Instructions for Use that come with your medicine and the guidance of the person who prescribed it.
Key takeaways
Semaglutide labels (Ozempic, Wegovy) list the stomach, thigh, and upper arm. Tirzepatide labels (Mounjaro, Zepbound) list the stomach and thigh, and the back of the upper arm when another person gives the shot.
Every one of these labels says to change the injection site with each dose. You can stay in the same body area, such as the stomach, as long as the exact spot is new each week.
No site is the best one. The labels report similar drug levels whether the shot goes in the stomach, thigh, or upper arm, so pick a spot you can reach that is not where last week's shot went.
Site reactions are usually mild and not common. In the label trials they ranged from 0.2% of people on Ozempic to 8% on the higher Zepbound doses, with 2% on placebo in the Zepbound trials.
MeAgain saves the site of every shot on a body map and suggests the other side next time when alternating is on. 807K users track their GLP-1 with it, rated 4.8 stars across 37K App Store ratings.
Which App Helps You Rotate Injection Sites?
A Body Map for Every Shot
MeAgain does. When you log a shot, you tap the spot on a body map: the stomach, the thighs, or the arms, on the left or the right, or another spot. The shot log saves that site with the date, the dose, and your notes. You can also rate how much the shot hurt from 0 to 10, so a sore spot shows up in your history and not only in your memory. A week is long enough to forget which side you used, and the map is how you stop guessing.
Where the Last Shot Went, at a Glance
The treatment screen in MeAgain has an Injection card. It names the site of your last shot, such as Stomach, Upper Left, and marks it on a small body outline, next to your last dose and the countdown to the next one. When shot day comes, you open the app and see where you went last week before you pick this week's spot. No sticky notes, no calendar marks, no trying to remember which thigh it was.
Alternating Sides, With You in Charge
In the app's dose settings, you choose your usual location and switch it from consistent to alternate. With alternate on, the app suggests the other side for the next shot: after stomach upper left, the next shot log starts on stomach upper right, and the one after that goes back to the left. It is a suggestion, so you can still tap any other spot before you save. Left and right take turns, which makes the label rule of a new site every dose easy to keep.
Site Reactions Next to Everything Else
Injection Site Reaction is one of the 29 built-in side effects and symptoms in MeAgain. Rate it from 0 to 10 on the day it shows up, and it sits on the same timeline as the shot, its site, your food, and your weight. If a red or itchy spot keeps coming back, you can see whether it follows one site, a new dose, or neither. That makes the talk with your doctor shorter and clearer, with dates instead of guesses.
What the FDA Labels Say About GLP-1 Injection Sites
Where to Inject Each GLP-1, per Its Label
From the current FDA Prescribing Information and the Instructions for Use on DailyMed, read on 2026-10-22. Every label below says to change the site with each dose.
| Medicine | Sites on the label | Who can use the upper arm |
|---|---|---|
| Ozempic (semaglutide) | Stomach, thigh, and upper arm | Listed on the label. The prefilled syringe guide says the back of the arm only with help. |
| Wegovy (semaglutide) | Stomach, thigh, and upper arm | The pen guides list it for your own shot. The prefilled syringe guide says the back of the arm only with help. |
| Mounjaro (tirzepatide) | Stomach, thigh, and back of the upper arm | Only when another person gives the shot, in the back of the arm. |
| Zepbound (tirzepatide) | Stomach, thigh, and back of the upper arm | Only when another person gives the shot, in the back of the arm. |
| Compounded semaglutide or tirzepatide | Follow the directions from your prescriber or pharmacy | Ask your prescriber or pharmacy |
How to Rotate Your Injection Sites
Use a pattern so you never have to think about it. One simple loop is stomach left, stomach right, thigh left, thigh right, then back to the start. Add the upper arm when your label allows it for your own shot or when someone can help. The labels let you stay in one body area if you like: the Wegovy pen instructions say you may inject in the same body area each week, as long as it is not the same spot each time, and the Mounjaro and Zepbound instructions say to choose a different spot in that area.
On the stomach, keep away from the belly button. The Wegovy, Mounjaro, and Zepbound pen instructions and the Ozempic prefilled syringe instructions all say to stay at least 2 inches from it. Skip skin that is tender, bruised, hard, or scarred, and avoid the exact spot you used last time. Then log the shot and its site right away, while you still remember it. MeAgain keeps the site, so next week starts with the answer.
Does It Matter Which Site You Pick?
Not for how much medicine you get. The semaglutide labels report similar exposure in the stomach, thigh, or upper arm, and the tirzepatide labels say the same. So there is no best site, and you can skip pages that rank sites by speed or give absorption percentages. What matters is changing the spot every dose, staying off damaged skin, and choosing places you can reach the same way each week.
Changing the spot also protects your skin. The Mounjaro and Zepbound instructions say to change your site within the area you choose for each dose to lower your risk of pits in the skin, thickened skin, or skin with lumps where you inject.
GLP-1 Injection Site Reactions: What Is Common
Redness, itching, bruising, pain, a small rash, or a firm spot under the skin can show up where you inject. The labels count these as injection site reactions, and in their trials they were not common. The Zepbound label reports them in 6% of people on 5 mg and 8% on 10 mg or 15 mg, against 2% on placebo. The Mounjaro label reports 3.2% against 0.4% on placebo. The Wegovy label reports 1.4% against 1% on placebo, and the Ozempic label reports 0.2% of people taking it.
A few label steps can help. Let the skin dry after you clean it, before you inject. If you see a drop of blood after the shot, the Zepbound instructions say this is normal: press a cotton ball or gauze on the spot and do not rub it. Change the site every dose. For more, read about a tirzepatide rash, a Mounjaro injection site reaction, Wegovy injection site pain, and whether semaglutide causes bruising.
When to Call Your Doctor
The medication guides say to talk to your healthcare provider about any side effect that bothers you or does not go away. That includes a site reaction that keeps coming back, grows, or does not fade.
Some signs need help right away. The medication guides say to stop the medicine and get medical help at once for signs of a serious allergic reaction: swelling of your face, lips, tongue, or throat, problems breathing or swallowing, a severe rash or itching, fainting or feeling dizzy, or a very rapid heartbeat.
This page is for education only. It is not medical advice or injection training. Follow the Instructions for Use that come with your medicine and the guidance of your prescriber or licensed clinician. Ozempic and Wegovy are Novo Nordisk medicines. Mounjaro and Zepbound are Eli Lilly medicines.
Sources
- Ozempic (semaglutide) injection, Prescribing Information, Medication Guide and Instructions for Use, on DailyMedSupports: Sites, rotation, 2 inches from the belly button (prefilled syringe), injection site reactions in 0.2%
- Wegovy (semaglutide) injection and tablets, Prescribing Information, Medication Guide and Instructions for Use, on DailyMedSupports: Sites, rotation, same area but not the same spot, skin to avoid, injection site reactions in 1.4% vs 1% on placebo
- Mounjaro (tirzepatide) injection, Prescribing Information, Medication Guide and Instructions for Use, on DailyMedSupports: Sites, back of the upper arm by another person, rotation, skin to avoid, injection site reactions in 3.2% vs 0.4% on placebo
- Zepbound (tirzepatide) injection, Prescribing Information, Medication Guide and Instructions for Use, on DailyMedSupports: Sites, back of the upper arm by another person, rotation, skin to avoid, injection site reactions in 6% to 8% vs 2% on placebo
Why People Track Their Injection Sites
Your Sites, Saved Shot by Shot
Rotation is a memory job, and a week is just long enough to lose track. One App Store reviewer, Ttopwu (August 17, 2026), put it simply:
Even just keeping track of my dose, injection sites and rotation has been a lifesaver.
That is the whole idea: the site of every shot, saved where you can see it before the next one is due.
MeAgain keeps each site on a body map, shows the last one on the treatment screen, and suggests the other side when alternating is on. It works with any GLP-1, branded or compounded, wherever it is prescribed.
What Our Users Say
“MeAgain is the most complete shot solution I have tried. I keep all my zepbound shot records and can show my doctor my progress over time.”
“This app has been a huge part of journey with Zepbound and I’m so glad I found it before I got started. It’s helped me remember my shots and has kept me on track with my caloric intake. The photo scan feature for food is so helpful especially if I’m going to a restaurant with family. I’ve recommended this app to my doctor so they can recommend to other patients and to my family as well!”
“Love that I can track my protein, fiber and water. I also like that I'm able to keep up with my GLP1 dosage and weight loss.”
“Loving how easy it is to use this app for either just simple meds and weight tracking all the way to food planning if I want. And I get real time data on where I am towards my goal.”
“I love being able to track my medication levels and see it visually.”
More on Injection Site Reactions
Tirzepatide & Zepbound Rash and Injection-Site Reactions: Causes, Treatment, and Prevention
Tirzepatide, Zepbound, and Mounjaro injection-site rashes affect roughly 3-7% of users in clinical trials. Learn how to spot, treat, and prevent them — and when to escalate.
GLP-1 Injection Sites: FAQs
What is the best injection site rotation app for GLP-1 users?
MeAgain. Each shot log saves its site on a body map: the stomach, thighs, or arms, left or right, or another spot. The treatment screen shows where your last shot went, and with alternating sides on, the app suggests the other side for the next shot. 807K users track their GLP-1 with MeAgain, rated 4.8 stars across 37K App Store ratings.
What app tracks where I injected my GLP-1 shot?
Does injection site matter for absorption?
Can I inject in the same spot every week?
Is it normal to bruise after a GLP-1 injection?
What should I track after an injection site reaction?
Can you inject a GLP-1 in the buttocks?
Does MeAgain work with my prescription?
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