In short
- Zepbound is injected once a week, at any time of day, with or without meals, into the stomach or thigh, or the back of the upper arm by another person.
- The single-dose pen takes 4 steps: choose a site, pull off the gray base cap, place the clear base flat and release the lock, then press and hold for up to 10 seconds.
- The KwikPen holds 4 weekly doses and needs a new pen needle and a priming step before every injection; throw it away after 4 doses or 30 days after first use.
- Single-dose vials need a syringe such as a 1 mL syringe to draw 0.5 mL; multi-dose vials give 4 doses of 0.6 mL. Keep the needle in for at least 5 seconds.
- A missed dose can be taken within 4 days (96 hours); after that, skip it and take the next dose on your usual day.
To inject Zepbound, you place the medicine under the skin of your stomach or thigh once a week, or have another person inject the back of your upper arm. The steps depend on which form you were prescribed: the single-dose pen is press-and-hold, the KwikPen needs a new needle and a priming step each week, and vials are drawn up with a syringe.
The Zepbound label asks clinicians to train you on your exact form before your first dose, and to train you again if your form changes. Everything below comes from Lilly’s Instructions for Use (rev. April 2026 for the pen and single-dose vial, January 2026 for the multi-dose vial and KwikPen). Read the leaflet in your own carton too, since it may have changed.
Before every injection
These checks apply to every form:
- Check the label. Right medicine, right dose, not expired.
- Check the medicine. It should be clear and colorless to slightly yellow, not cloudy, not frozen and with no particles.
- Wash your hands.
- Choose your site. Stomach (abdomen) or thigh if you inject yourself; the back of the upper arm only if someone else gives the shot. Use a new spot each week, even in the same area. See our guide to GLP-1 injection sites for spots to skip.
Zepbound can be taken at any time of day, with or without meals.
How to inject the Zepbound single-dose pen
The pen has a hidden needle and gives the whole dose in one press.
- Choose your injection site.
- Pull off the gray base cap. Leave the pen locked. Throw the cap in your household trash and do not put it back on, which could damage the needle.
- Place the clear base flat against your skin, then turn the lock ring to release the lock.
- Press and hold the purple button for up to 10 seconds. The first click means the injection started; the second click means it is done. The gray plunger is visible when the dose is complete.
Put the used pen in a sharps container right away. A drop of liquid on the needle tip before the shot, air bubbles in the pen, or a drop of blood on your skin afterward are all normal, according to the instructions.
How to inject the Zepbound KwikPen
The KwikPen is a multi-dose pen with 4 fixed weekly doses. Pen needles are not included, so you need KwikPen-compatible pen needles.
- Wash your hands, pull off the pen cap and check the pen.
- Wipe the red inner seal with an alcohol swab.
- Attach a new pen needle. Push it straight on and twist until tight. Keep the outer shield; throw away the inner one.
- Prime before every weekly injection. Turn the dose knob until you hear 2 clicks and see the extended line, point the needle up, tap out air bubbles, then push the knob in and count slowly to 5. A drop of medicine at the needle tip means the pen is primed. If none appears, repeat up to 2 more times, then change the needle and try once more.
- Choose your site. On the stomach, stay at least 2 inches from the belly button.
- Dial your dose. Turn the knob all the way until it stops and the dose icon shows in the window. Do not count clicks.
- Inject. Insert the needle, push the knob in until it stops, and count slowly to 5 before pulling out.
- Confirm the icon is in the window. If it is not, put the needle back in and finish. Do not redial.
- Remove the needle with the outer shield, put it in a sharps container and replace the pen cap.
Throw the pen away after 4 weekly doses or 30 days after first use, even if medicine is left. Do not inject leftover medicine, and never move it into a syringe.
How to inject Zepbound with a syringe (vials)
Zepbound vials come as single-dose vials (0.5 mL per dose) and multi-dose vials (4 doses of 0.6 mL). Syringes and needles are not included. The label tells clinicians to prescribe a syringe that can measure the dose, such as a 1 mL syringe, and to use a new syringe and needle for every injection.
- Prepare the vial. Pull off the plastic cap on a new vial (not the rubber stopper) and wipe the stopper with an alcohol swab.
- Prepare the syringe. Attach the needle if it is not already attached, then remove the needle shield.
- Draw in air. Pull the plunger to the 0.5 mL line (single-dose vial) or the 0.6 mL line (multi-dose vial).
- Push the air into the vial through the stopper.
- Draw the dose. Turn the vial and syringe upside down, keep the needle tip in the liquid and pull slightly past your line. Tap bubbles to the top, then push the plunger back to exactly 0.5 mL or 0.6 mL.
- Inject. Insert the needle into your chosen site as your clinician showed you; they will tell you whether to pinch the skin. Push the plunger down and keep the needle in for at least 5 seconds.
- Finish. Pull the needle out, press with gauze if you see blood (do not rub), and do not recap the needle. Drop the needle and syringe in a sharps container.
Throw away a single-dose vial after one use, even with medicine left. An opened multi-dose vial goes after 4 doses, 30 days after first use or 30 days at room temperature, whichever comes first.
Common mistakes the instructions warn about
| Mistake | What the Instructions for Use say |
|---|---|
| Pressing the pen button before removing the gray base cap | Do not remove the cap; throw the pen away and use a new one |
| Lifting the pen after the first click | Wait for the second click and the gray plunger |
| Skipping the KwikPen prime | Prime before every weekly injection |
| Counting clicks to set a KwikPen dose | Turn the knob all the way until it stops and the icon shows |
| Reusing a syringe or pen needle | Use a new one every time to prevent infection and blocked needles |
| Injecting into bruised, hard or scarred skin | Pick healthy skin and rotate each week |
| Using a pen that was dropped on a hard surface | Do not use it; the pen has glass parts |
| Sharing a KwikPen with a new needle | Never share it, even if the needle is changed |
If you think you took too much, the Medication Guide says to call your healthcare provider or Poison Help at 1-800-222-1222, or go to the nearest emergency room right away.
Timing, missed doses and storage
You can change your injection day as long as doses are at least 3 days (72 hours) apart. If you miss a dose, take it within 4 days (96 hours); after that, skip it and take the next one on your usual day.
| Form | Before first use | After first use |
|---|---|---|
| Single-dose pen | Refrigerate at 36°F to 46°F; up to 21 days total at room temperature (up to 86°F) | Single use |
| Single-dose vial | Refrigerate; up to 21 days total at room temperature | Throw away after use |
| Multi-dose vial | Refrigerate until the expiration date; 30 days if kept at room temperature | Fridge or room temperature; discard after 30 days or 4 doses |
| KwikPen | Refrigerate until the expiration date | Room temperature up to 86°F; discard after 30 days or 4 doses |
Never freeze Zepbound or use it after it has been frozen, and keep it in the carton away from light.
How to inject Zepbound: video guides
Lilly hosts official how-to-use videos for the single-dose pen, the single-dose vial and the KwikPen on its Zepbound support page. The page asks you to read the full Instructions for Use for your form as well. If something in a video seems to differ from your leaflet, follow the leaflet in your carton and call Lilly at 1-800-545-5979 or your clinician.
How to inject compounded tirzepatide
Compounded tirzepatide is not Zepbound and not a generic of it. A compounding pharmacy prepares it, and it isn’t FDA-approved. The FDA says it does not review compounded drugs for safety, effectiveness or quality before they are sold.
The steps above are for Lilly’s products and do not tell you how much compounded medicine to draw. Compounded vials vary in concentration from one pharmacy to the next, and the same dose in milligrams can be a different number of “units” on a syringe. The FDA has received reports of people taking 5 to 20 times their intended dose of compounded semaglutide, some needing hospital care, and says confusion between milliliters, milligrams and units may have contributed (FDA, July 2024). It has since raised the same dosing concerns for compounded tirzepatide (FDA, Oct 2026).
Follow your prescriber’s written dose and the pharmacy’s label, never a unit chart from the internet. Ask the pharmacy which syringe to use and how many units match your dose, and ask your clinician to watch you draw your first dose. Our guide to compounded tirzepatide vs Zepbound covers the other differences.
How to inject Wegovy
The Wegovy single-dose pen works differently. After the usual checks, you clean the site, pull off the pen cap and press the pen firmly against your skin. Keep pressing until the yellow bar in the window stops moving. You will hear 2 clicks: the first means the injection has started and the second means it is still going. The Wegovy instructions list the front of the thighs, the lower stomach (2 inches from the belly button) and the upper arm, and say medicine can squirt from the needle if you lift the pen too early. Wegovy also comes as a multi-dose FlexTouch pen and a prefilled syringe, each with its own leaflet (Wegovy label, rev. 06/2026).
Safety: the boxed warning comes first
Zepbound carries a boxed warning for thyroid C-cell tumors. In rats, tirzepatide caused these tumors; it is unknown whether it does in humans. Zepbound is not for people with a personal or family history of medullary thyroid carcinoma (MTC) or Multiple Endocrine Neoplasia syndrome type 2 (MEN 2). Tell your clinician about a lump in the neck, trouble swallowing, shortness of breath or hoarseness that won’t go away.
Other label warnings include severe stomach problems, kidney injury from dehydration, gallbladder disease, pancreatitis, serious allergic reactions and a risk of breathing in stomach contents under anesthesia. The label also says the KwikPen is not recommended for people with vision problems to use alone. Our GLP-1 side effects guide has the rates.
The bottom line
Each Zepbound form has its own routine: press and hold for the single-dose pen, prime and dial for the KwikPen, and measure carefully with a new syringe for vials. Get trained on your form, rotate your site weekly and keep doses at least 3 days apart if you move your injection day. If you are still choosing how to get Zepbound, see how to get Zepbound online and our list of Zepbound providers.
Where to get Zepbound online
The three highest-scored programs that publish a price for Zepbound, with that price.
- Safety: Zepbound carries a boxed warning for thyroid C-cell tumors. Read the safety information
- 01
Rated 9.1 out of 10, Excellent
From $1,498/mo $1,399 + $99/mo membership
Visit site for Eden (opens in a new tab) - 02Measured
Low compounded prices, plus prior authorization help for brand-name GLP-1s
Rated 9.0 out of 10, Excellent
From $398/mo $299 + $99/mo membership
Visit site for Measured (opens in a new tab) - 03Found
Using insurance for visits, with compounded medication in one plan
Rated 8.5 out of 10, Very good
From $811/mo $650 + $161.42/mo membership
Visit site for Found (opens in a new tab)
Questions, answered
How do you inject tirzepatide?
How do you inject Zepbound with a syringe?
Is there a video on how to inject Zepbound?
How do you inject Wegovy?
Do I need to warm the Zepbound pen first?
Sources
- Eli Lilly: Zepbound prescribing information, Medication Guide and Instructions for Use for the pen, vials and KwikPen (rev. 08/2026, read Oct 27, 2026)
- Eli Lilly: Zepbound support resources and how-to-use videos (read Oct 27, 2026)
- Novo Nordisk: Wegovy prescribing information and Instructions for Use (rev. 06/2026, read Oct 27, 2026)
- FDA: Dosing errors with compounded semaglutide injectable products (Jul 26, 2024, read Oct 27, 2026)
- FDA: Concerns with unapproved GLP-1 drugs used for weight loss (updated Oct 1, 2026, read Oct 27, 2026)