Guide · 6 min read
GLP-1 injection sites & rotation
Wegovy, Zepbound, Ozempic, Mounjaro, and Saxenda all go in the same three places. Here's how to pick a spot, rotate it properly, and make dose day sting a lot less.
The three approved sites
These are subcutaneous injections — they go into the fatty layer just under the skin, not into muscle. That limits you to three areas, and all three work equally well.
Abdomen
Most popularStay at least 2 inches (about 5 cm) away from the navel and off the waistband line. Easiest to see, easiest to pinch, and usually the least sensitive.
Front or outer thigh
Easy to reachUse the meaty area between the top of the knee and the top of the thigh, toward the outside. Best if you sit down so the muscle stays relaxed.
Back of the upper arm
Needs a helperThe fleshy area on the back of the arm between shoulder and elbow. Hard to do solo without twisting — most people ask a partner, or skip it.
Why rotation matters
Injecting into the same square inch week after week can build up lipohypertrophy — firm, rubbery lumps of fatty tissue under the skin. They're sore, they change the way the skin looks, and medication injected into them can absorb unpredictably. They also take months to soften once they form.
Rotation fixes this cheaply: give every site three or four weeks off, and move about an inch from your last spot even inside the same area.
A simple 4-week rotation
You don't need a chart on the fridge. Most people do fine cycling left and right across two areas:
| Dose day | Site |
|---|---|
| Week 1 | Left abdomen |
| Week 2 | Right abdomen |
| Week 3 | Left thigh |
| Week 4 | Right thigh |
| Week 5 | Back to left abdomen (shift about an inch from week 1) |
Add the arms if you have someone to help and you want a 6-week cycle instead.
Step by step
- Take the pen out of the fridge about 15–30 minutes early. Cold medication stings more going in.
- Pick a site you haven't used in at least three weeks. Skip anything bruised, red, tender, scarred, lumpy, or right on a stretch mark.
- Wipe with an alcohol swab and let it air-dry completely — wet alcohol is the sting.
- Press the pen flat against the skin at 90°, press the button, and hold for the full count in your pen's instructions (usually 5–10 seconds) so the whole dose delivers.
- Lift straight out. Don't rub afterward — press gently with clean gauze if it beads.
- Log the dose and which site you used, so next week is an easy decision.
Making it hurt less
- Relax the area. Sit for thigh shots; a clenched muscle makes it worse.
- Go fast and straight. Angling the pen drags the needle sideways.
- Try a cold pack for 30 seconds first if you're needle-sensitive — but not directly before if it makes the skin tight.
- Change the time of day. Many people find evening doses mean they sleep through the worst of the first-night nausea.
When to call your prescriber
Mild redness, a small bump, or itching at the site that fades within a day or two is common. Reach out if you notice a lump that doesn't go away, spreading redness or warmth, pus, a site that's still painful days later, or any full-body reaction like hives, swelling, or trouble breathing — that last group is urgent.
Common questions
Does the site change how well it works?
For weekly GLP-1s, no meaningful absorption difference has been shown between abdomen, thigh, and arm. Pick what's comfortable.
Can I inject through clothing?
No — you need clean, bare, dry skin.
What if I hit a small blood vessel and it bleeds?
A drop of blood or a small bruise is normal. Press gently, don't rub, and choose a different spot next time.
I take the pill, not the shot.
Then none of this applies to you — your version of this guide is the 30-minute wait before food, which Dosejoy times for you automatically.
Never guess which side you used
Dosejoy logs every dose in one tap and keeps your history right where you need it, so rotation stays effortless.
Start free →Related: GLP-1 nausea tips · Starting Wegovy
Not medical advice. Always follow the instructions that came with your pen and your prescriber's guidance.