# Where to Inject Ozempic, Wegovy and Zepbound, and How Long Pens Last Out of the Fridge

> Inject under the skin of the abdomen (at least 2 inches from the belly button), thigh or upper arm, using a new spot each time; for Zepbound and Mounjaro, someone else should inject the back of the upper arm. At up to 86°F, US labels allow 28 days out of the fridge for Wegovy single-dose pens and 21 days for Zepbound single-dose pens. Never use a frozen pen.

- URL: https://glpcalendar.app/blog/glp-1-injection-sites-and-storage
- Published: 2026-09-29
- Updated: 2026-09-29
- Publisher: GLP Calendar (https://glpcalendar.app)

Every injectable GLP-1 goes under the skin, and the US labels name the same three areas: abdomen, thigh and upper arm. The details that trip people up are elsewhere: who should inject the arm, how far to stay from the belly button, why pen clicks are not a dose, and how many days each device can spend out of the fridge. This guide pulls those rules from the current US prescribing information and instructions for use, as of September 2026.

## Where can you inject Ozempic, Wegovy or Zepbound?

Under the skin of the abdomen, thigh or upper arm, never into a muscle or vein. Several instructions for use add that you should stay at least 2 inches (5 cm) from the belly button, and the Zepbound and Mounjaro labels say another person should inject the back of the upper arm.

| Medication | Areas on the US label | Upper-arm note |
|---|---|---|
| Ozempic | Abdomen, thigh, upper arm | Pen: no helper note. Prefilled syringe: back of upper arm only with help from someone else |
| Wegovy | Abdomen, thigh, upper arm | Single-dose pen and FlexTouch: no helper note. Prefilled syringe: back of upper arm only with help |
| Zepbound, Mounjaro | Abdomen, thigh, back of upper arm | Another person should inject the back of the upper arm |
| Trulicity | Abdomen, thigh, upper arm | Pen instructions: another person should inject the back of the upper arm |
| Victoza | Abdomen, thigh, upper arm | Upper arm only if a caregiver gives the injection |
| Saxenda | Abdomen, thigh, upper arm | No helper note |

Tirzepatide is the only one of these with the helper rule written into the prescribing information itself: "Inject ZEPBOUND subcutaneously in the abdomen, thigh, or another person should inject in the back of the upper arm."

The 2-inch distance from the belly button appears in the Wegovy pen, FlexTouch and syringe instructions, the Ozempic syringe instructions and the Zepbound and Mounjaro KwikPen instructions. For a refresher on the medicines themselves, see the guides to [semaglutide](https://glpcalendar.app/blog/semaglutide) and [tirzepatide](https://glpcalendar.app/blog/tirzepatide).

## Does the injection site change how well the medicine works?

No meaningful difference, according to the labels. The semaglutide and tirzepatide labels report similar drug exposure from the abdomen, thigh and upper arm, and the Wegovy label says the injection site can be changed without a dose change. Choose the area you can inject comfortably and correctly.

The older drugs show the same pattern. For dulaglutide (Trulicity), the injection site "had no statistically significant effect" on exposure. For liraglutide, exposure from the thigh was 22% lower than from the abdomen in a Victoza study, but the label still calls the three sites comparable, and the Saxenda label calls them similar.

## How should you rotate injection sites?

Use a different spot every time. The labels allow the same body area week after week, as long as the exact spot changes. The Zepbound instructions say rotating within the area you choose reduces the risk of lipodystrophy (pits or thickened skin) and localized cutaneous amyloidosis (lumps under the skin).

The Ozempic label asks for "a different injection site each week when injecting in the same body region," and the liraglutide labels ask you to rotate within the same region to lower the risk of cutaneous amyloidosis.

### A simple rotation pattern

Here is one example for a weekly shot. It is not a label requirement, just an easy way to keep track:

1. Week 1: left side of the abdomen, at least 2 inches from the belly button.
2. Week 2: right side of the abdomen.
3. Week 3: left thigh.
4. Week 4: right thigh.
5. Week 5: back to the left abdomen, on a different spot from week 1.

If someone can help, the backs of the upper arms add two more areas. A tracker such as GLP Calendar can log each site and suggest the next one, which helps when the weeks blur together.

### What skin should you avoid?

The instructions list the same kinds of skin to skip:

- Skin that is tender, bruised, red, scaly or hard.
- Scars, stretch marks or otherwise damaged skin.
- Skin with pits, thickening or lumps, the changes that rotation is meant to prevent.
- The area within 2 inches of your belly button.

### What if you also inject insulin?

Give them as separate injections and never mix them. The Ozempic, Mounjaro, Trulicity and Victoza labels say both can go in the same body region, but the injections should not be next to each other. The Zepbound vial instructions also say not to inject it in the same site used for other medicines.

## How do multi-dose pens work, and why shouldn't you count clicks?

Multi-dose pens hold a set number of fixed doses and are built to deliver only the doses they are labeled for. Every pen's instructions we reviewed say to set the dose with the dose counter or dose window, not by counting clicks. There is no clinical evidence for dialing in-between "microdoses" with clicks.

| Pen | What it holds | Before injecting | Throw it away |
|---|---|---|---|
| Ozempic pen | Fixed doses only: 4 per pen, or 4 × 0.25 mg plus 2 × 0.5 mg in the starter pen | Flow check with each new pen only | 56 days after first use, even if medicine is left |
| Wegovy FlexTouch | 4 doses of 2.4 mg only | Flow check with each new pen only | After 4 doses or 56 days after first use |
| Zepbound or Mounjaro KwikPen | 4 fixed weekly doses | Prime before every weekly injection | After 4 doses or 30 days after first use |
| Saxenda pen | Daily doses of 0.6, 1.2, 1.8, 2.4 or 3 mg | Flow check with each new pen | 30 days after first use |
| Victoza pen | Daily doses of 0.6, 1.2 or 1.8 mg | Flow check with each new pen | 30 days after first use |

The wording is blunt. The Ozempic, Wegovy FlexTouch, Saxenda and Victoza instructions say, "Do not set the dose by counting the number of clicks you hear," and the first three add that the dose selector clicks differently when turned forward or backward. The KwikPen instructions say, "Do not count clicks as you select the dose." Every pen here is labeled to be used by one person only, even with a new needle.

### How do you prime a KwikPen?

In outline (follow the full instructions that come with your pen):

1. Prime before each weekly injection: turn the dose knob until you hear 2 clicks and see the extended line in the dose window, then push the knob in and slowly count to 5. A drop at the needle tip means the pen is primed.
2. Turn the dose knob all the way until it stops and the dose icon shows in the window. That is your full weekly dose.
3. Inject by pushing the knob in until it stops, then slowly count to 5.
4. After 4 doses, the pen stops you from dialing a full dose. The instructions say to throw it away "including the unused medicine" and not to transfer the leftover into a syringe.

## How long can GLP-1 pens stay out of the fridge?

It depends on the device. At up to 86°F (30°C), US labels allow 28 days for Wegovy single-dose pens, a total of 21 days for Zepbound and Mounjaro single-dose pens, and 14 days for Trulicity. Pens in use have their own limit: 56 days for Ozempic and Wegovy FlexTouch, 30 days for KwikPens, Saxenda and Victoza.

| Product and device | Before first use | Out of the fridge (US label) | Once in use |
|---|---|---|---|
| Ozempic pen | Fridge, 36–46°F | No allowance listed before first use | 56 days at 59–86°F or in the fridge |
| Ozempic prefilled syringe | Fridge | Up to 28 days at 46–86°F | Single use |
| Wegovy single-dose pen (including 7.2 mg) or syringe | Fridge | Up to 28 days at 46–86°F, before the cap comes off | Single use |
| Wegovy FlexTouch | Fridge | No allowance listed before first use | 56 days at 59–86°F or in the fridge |
| Zepbound or Mounjaro single-dose pen or vial | Fridge | A total of 21 days at up to 86°F, then discard | Single use |
| Zepbound or Mounjaro KwikPen or multi-dose vial | Fridge, usable to the expiration date | Unopened at room temperature: discard after 30 days | Fridge or up to 86°F; discard at 30 days or after 4 doses |
| Trulicity pen | Fridge | A total of 14 days at up to 86°F | Single use |
| Saxenda or Victoza pen | Fridge | Victoza: if left out by mistake, use or discard within 30 days | 30 days at 59–86°F or in the fridge |
| Wegovy pill, Rybelsus, Ozempic pill, Foundayo | Room temperature, 68–77°F | Excursions to 59–86°F permitted | Semaglutide pills: original bottle, away from moisture |

Three details matter:

- **"Total" means the days add up.** The Zepbound, Mounjaro and Trulicity labels count a total number of days at room temperature, so separate stretches outside the fridge count toward the same limit.
- **The Wegovy FlexTouch range is inconsistent.** The prescribing information and Medication Guide say 59–86°F after first use, while the pen's own instructions say 68–77°F. Ask your pharmacist which range to follow.
- **Light and the cooling element.** Keep single-dose pens in the carton to protect them from light and keep caps on multi-dose pens. The semaglutide and liraglutide labels also warn against storing pens next to the fridge's cooling element.

## Can Ozempic freeze, and what if a pen froze or got too hot?

Yes, a pen can freeze in the freezer or against the fridge's cooling element, and a frozen pen should not be used. Every GLP-1 injection label we reviewed says not to freeze the medicine and not to use it if it has been frozen. The Wegovy guide also says to throw away a pen exposed to temperatures above 86°F (30°C).

If it happens:

1. Do not inject it, even if it has thawed and looks normal.
2. Put it in a sharps disposal container.
3. Call your pharmacy or prescriber about a replacement. If getting one takes several days, the [missed-dose rules](https://glpcalendar.app/blog/missed-glp-1-dose) for your medicine apply.
4. For heat, compare with the 86°F (30°C) limit on every injectable label. If you cannot tell how hot the pen got, for example after hours in a parked car, ask your pharmacist before using it.

## How should you travel with GLP-1 pens?

Keep pens with you in your carry-on, away from freezing, heat and direct light, and count their days out of the fridge against your label's limit. TSA allows liquid medications in carry-on bags, and medically necessary ice packs are allowed even when partly melted.

1. **Pack them in your carry-on.** The CDC advises carrying medicines in hand luggage in case checked bags are lost or delayed.
2. **Tell the security officer.** TSA allows larger amounts of medically necessary liquids in reasonable quantities if you declare them for inspection.
3. **Keep it cold, not frozen.** TSA allows medically necessary gel ice packs "regardless of their physical state," but a pen that freezes must not be used. Wrap the pen so it does not sit directly on a frozen pack.
4. **Never leave pens in a parked car.** Several pen instructions warn that a car can make a pen "too hot or too cold."
5. **Write down the date a pen leaves the fridge.** The Ozempic syringe instructions suggest exactly this, so you know when its 28 days run out.
6. **Carry paperwork.** The CDC suggests original labeled containers, copies of your prescriptions and a note from your prescriber for injectable medicines, and checking that your medicine is allowed at your destination.
7. **Bring enough for the whole trip, plus extra for delays,** as the CDC advises.

Pills are simpler: keep them at room temperature in their original bottle. If a trip moves your injection day, the [day-change spacing rules](https://glpcalendar.app/blog/missed-glp-1-dose) apply.

## Bottom line

- Inject into the abdomen (at least 2 inches from the belly button), thigh or upper arm. On Zepbound or Mounjaro, only a helper should use the back of the arm.
- Rotate with every dose, skip damaged skin, and keep insulin shots separate.
- Set doses with the dose counter, never by clicks. Prime a KwikPen before every dose and discard it after 4 doses or 30 days.
- Know your device's out-of-fridge limit, and never use a pen that froze or overheated.
- When in doubt, ask your pharmacist before you inject.

## Frequently asked questions

### Do I need to warm my pen to room temperature before injecting?

Not for Zepbound or Mounjaro single-dose pens: their instructions say it is not necessary to warm the pen to room temperature. The Ozempic and Wegovy prefilled syringe instructions say not to warm a syringe with heat sources such as hot water or a microwave.

### Can I put a pen back in the fridge after it has been out?

For pens already in use, the Ozempic, Wegovy FlexTouch, KwikPen, Saxenda and Victoza labels allow either the fridge or room temperature until the in-use limit. For single-dose pens, the Zepbound, Mounjaro and Trulicity labels count a total number of days out of the fridge, so separate stretches outside add up. Ask your pharmacist if you are unsure.

### What if my pen was left in a hot car?

The Ozempic, Saxenda and Wegovy FlexTouch instructions say not to leave a pen in a car or anywhere it can get too hot or too cold, and the Wegovy Medication Guide says to throw away a pen exposed to temperatures above 86°F (30°C). If you cannot tell how hot it got, ask your pharmacist before using it.

### Can I share a pen if I change the needle?

No. The US labels for Ozempic pens, Wegovy FlexTouch, Zepbound and Mounjaro KwikPens, Saxenda and Victoza all say never to share a pen between people, even if the needle is changed, because infections can pass between users.

### How do I throw away used pens and needles?

Put used needles, syringes and single-dose pens in an FDA-cleared sharps disposal container right away. If you do not have one, the Zepbound instructions allow a heavy-duty plastic household container with a tight-fitting, puncture-resistant lid that stays upright and resists leaks, and they ask you to follow your community's disposal rules.

## Sources

- [Ozempic (semaglutide) injection, US prescribing information, Medication Guide and Instructions for Use, revised June 2026, DailyMed](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=adec4fd2-6858-4c99-91d4-531f5f2a2d79)
- [Wegovy (semaglutide) US prescribing information, Medication Guide and Instructions for Use (pens, syringe, FlexTouch), revised June 2026, DailyMed](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=ee06186f-2aa3-4990-a760-757579d8f77b)
- [Zepbound (tirzepatide) US prescribing information, Medication Guide and Instructions for Use (pen, vials, KwikPen), revised August 2026, DailyMed](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=487cd7e7-434c-4925-99fa-aa80b1cc776b)
- [Mounjaro (tirzepatide) US prescribing information, Medication Guide and Instructions for Use, revised August 2026, DailyMed](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=d2d7da5d-ad07-4228-955f-cf7e355c8cc0)
- [Trulicity (dulaglutide) US prescribing information and Instructions for Use, revised June 2026, DailyMed](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=463050bd-2b1c-40f5-b3c3-0a04bb433309)
- [Victoza (liraglutide) US prescribing information, Medication Guide and Instructions for Use, revised October 2025, DailyMed](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=5a9ef4ea-c76a-4d34-a604-27c5b505f5a4)
- [Saxenda (liraglutide) US prescribing information, Medication Guide and Instructions for Use, revised February 2026, DailyMed](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=3946d389-0926-4f77-a708-0acb8153b143)
- [Rybelsus and Ozempic tablets (oral semaglutide) US prescribing information, revised January 2026, DailyMed](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=27f15fac-7d98-4114-a2ec-92494a91da98)
- [Foundayo (orforglipron) US prescribing information, revised July 2026, DailyMed](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=8ac446c5-feba-474f-a103-23facb9b5c62)
- [Transportation Security Administration: Medications (liquid), What Can I Bring](https://www.tsa.gov/travel/security-screening/whatcanibring/items/medications-liquid)
- [Transportation Security Administration: Gel ice packs, What Can I Bring](https://www.tsa.gov/travel/security-screening/whatcanibring/items/gel-ice-packs)
- [CDC Travelers' Health: Traveling abroad with medicine](https://wwwnc.cdc.gov/travel/page/travel-abroad-with-medicine)

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Educational content, not medical advice. GLP Calendar is a tracking app; it does not recommend or calculate doses.