How to use Zepbound: the single-dose pen and the vial
Inject Zepbound under the skin once a week, on any day and at any time, with or without food. With the single-dose pen, pull off the gray cap, set the clear base flat on your skin, unlock it and hold the purple button through two clicks. With the vial, draw exactly 0.5 mL into a new syringe first.
Before you start
Zepbound now comes in four presentations, and they are not used the same way: the prefilled single-dose pen, the single-dose vial sold through LillyDirect, a multi-dose vial and the single-patient-use KwikPen, each holding four weekly doses. Lilly's label asks that you are trained on the specific one you were prescribed, and retrained if it changes, so check the carton before anything else. Confirm the strength and expiry date, and that the liquid is clear and colorless to slightly yellow, not frozen, cloudy or carrying particles. Tell your prescriber if you or a relative has had medullary thyroid carcinoma or MEN 2, which rule Zepbound out, and about any pancreatitis, gallbladder disease, diabetic eye disease, pregnancy plans, or insulin or sulfonylurea use. For a vial you also need a 1 mL syringe, a needle, an alcohol swab and gauze.
Step by step
Pen: take it out and inspect it
Remove the pen from the refrigerator and leave the gray base cap on. Check the label for the right medicine, dose and date, and look for damage. Lilly's Instructions for Use state it is not necessary to warm the pen to room temperature first. Air bubbles inside the pen are normal. Wash your hands.
Pen: choose a site and uncap
Pick a spot on the abdomen or thigh, or the back of the upper arm if someone else injects. Make sure the pen is still locked, then pull the gray base cap straight off and put it in household trash. Do not put the cap back on, because that can damage the needle, and do not touch the needle.
Pen: place flat, then unlock
Set the clear base flat against your skin at the chosen site, and only then turn the lock ring to unlock. If you unlocked the pen and pressed the button before the gray cap came off, the Instructions for Use say to throw that pen away and use a new one rather than try again.
Pen: press and hold for up to 10 seconds
Press and hold the purple injection button for up to 10 seconds. The first click means the injection has started; the second click means it is complete. Some people also hear a soft click just before the second loud one, which is normal. Keep the pen on your skin until that second loud click.
Pen: confirm the gray plunger
The gray plunger showing in the clear base is the confirmation that the dose went in. If you cannot see it, do not inject a second pen to be safe — call Lilly on 1-800-545-5979 or your prescriber first. A drop of liquid on the needle tip before injecting is also normal, according to the Instructions for Use.
Vial: prepare the stopper and syringe
Take the single-dose vial from the refrigerator and check it the same way as a pen. Pull off the plastic cap but leave the rubber stopper in place, then wipe the stopper with an alcohol swab. Unwrap a new syringe and needle, attach the needle if it is separate, and pull the needle shield straight off.
Vial: add air, then draw 0.5 mL
Pull back to draw 0.5 mL of air, push the needle through the stopper and inject that air into the vial. Turn vial and syringe upside down, keep the needle tip in the liquid, and pull slightly past the 0.5 mL line. Tap any bubbles to the top, then push the plunger back to exactly 0.5 mL.
Vial: inject and hold for 5 seconds
Withdraw the syringe from the vial, insert the needle into clean skin at your chosen site as your prescriber showed you, and push the plunger down fully. Leave the needle in for at least 5 seconds so the whole dose is delivered. If you see blood afterwards, press lightly with gauze; do not rub the spot.
Dispose of everything once
Put the used pen, or the syringe and needle, straight into an FDA-cleared sharps container without recapping. Throw away an opened single-dose vial after one use even if liquid is left. Multi-dose vials and the KwikPen are different: they hold exactly four weekly doses and have their own Instructions for Use.
Schedule
Zepbound is taken once a week, at any time of day, with or without meals. The label starts everyone at 2.5 mg weekly for four weeks; that dose is for starting only and is not approved for maintenance. After four weeks it goes to 5 mg, then may rise in 2.5 mg steps after at least four weeks on each dose. Maintenance for weight reduction is 5, 10 or 15 mg; for obstructive sleep apnea it is 10 or 15 mg. The maximum is 15 mg weekly. You can move your weekly day if needed, provided at least 3 days (72 hours) separate the two doses.
How and where to take it
The label lists three areas: the abdomen, the thigh, and the back of the upper arm, with the arm reserved for someone else injecting. Your prescriber can help choose the site that suits you. Rotate each week — the Instructions for Use allow the same area but ask for a different spot within it — because repeated use of one spot can cause pitted or thickened skin, or lumps. Skip skin that is tender, bruised, scaly, hard, scarred or damaged. Do not mix Zepbound with any other medicine, and do not inject it into the exact site you used for another injectable such as insulin.
Storage
Keep single-dose pens and single-dose vials in the refrigerator at 36°F to 46°F (2°C to 8°C), in the original carton to block light. Never freeze them; a frozen pen or vial must be thrown away. If needed, either can be kept unrefrigerated at up to 86°F (30°C) for a total of 21 days, then discarded. The multi-dose vial and KwikPen follow a different rule: 30 days at room temperature, or 30 days after first use, whichever comes first. The pen contains glass, so do not use one that has been dropped on a hard surface.
If you miss a dose
The label gives a four-day window. If you remember within 4 days (96 hours) of the missed dose, inject it as soon as you can, then continue on your usual weekly day. If more than 4 days have passed, skip the missed dose and take the next one on your regular day. Either way, the next two doses still need at least 3 days (72 hours) between them. Never inject two doses to catch up, and ask your prescriber how to restart after several missed weeks.
If you take too much
Too much tirzepatide is most likely to show up as severe nausea, vomiting or diarrhea, and as low blood sugar if you also take insulin or a sulfonylurea. The label directs you to the Poison Help Line on 1-800-222-1222 or a medical toxicologist, and notes that observation may be needed for some time because tirzepatide's half-life is about five days. Get emergency care if you cannot keep fluids down, or you develop confusion, shaking, sweating or fainting.
What to avoid
Do not combine Zepbound with any other tirzepatide product or any GLP-1 medicine; the label advises against it. If you take birth control pills, switch to a non-oral method or add a barrier method for 4 weeks after starting and 4 weeks after each dose increase. Avoid getting dehydrated when stomach side effects hit, since the label links fluid loss to kidney injury. Tell any surgeon or anesthetist you use Zepbound, because of the aspiration risk during sedation.
Frequently asked questions
Is the Zepbound vial injected differently from the pen?
Yes. The pen has a hidden, pre-set needle and delivers its dose automatically once you place it flat, unlock it and press the purple button. The single-dose vial needs you to supply a syringe and needle, inject 0.5 mL of air, draw exactly 0.5 mL of medicine and push the plunger yourself, then hold the needle in place for at least 5 seconds. The medicine, the strengths from 2.5 mg to 15 mg, the injection sites and the weekly schedule are the same for both.
What size syringe do I need for a Zepbound vial?
The label asks for a syringe appropriate for the dose, and gives a 1 mL syringe capable of measuring a 0.5 mL or 0.6 mL dose as the example. Single-dose vials hold 0.5 mL per dose; the newer multi-dose vials use 0.6 mL per dose, so the draw line is different. Always use a new syringe and needle for each injection. The vial carton does not include them, so your prescriber or pharmacist should confirm the needle length and gauge that suit you.
Do I need to warm my Zepbound pen before injecting?
No. The pen's Instructions for Use answer this directly: it is not necessary to warm the pen to room temperature before injecting. If you prefer to let it sit out briefly before injecting, that is allowed, though the time counts toward the 21-day room-temperature limit. The label's other rules still apply: never freeze the pen, keep it in its carton away from heat and light, and do not use one that has been dropped.
How long can Zepbound be out of the fridge?
Single-dose pens and single-dose vials can stay unrefrigerated at up to 86°F (30°C) for a total of 21 days, after which they must be thrown away. The clock is cumulative, so time out of the fridge adds up across trips. Multi-dose vials and KwikPens allow 30 days at room temperature instead. If a shipment arrives warm and you do not know how hot it got, ask the dispensing pharmacy before using it rather than guessing, and do not use anything that looks cloudy.
What if I did not hear the second click?
Check the clear base for the gray plunger. The Instructions for Use treat the visible plunger as the confirmation that the dose was delivered, so if it is showing, the injection worked even if the click was quiet or you missed it. If the plunger is not showing, do not take another pen straight away, because a double dose is harder to undo than a late one. Call Lilly on 1-800-545-5979 or your prescriber, who can tell you whether to re-dose.
Can I change the day I take Zepbound?
Yes. The label allows the weekly day to move as long as at least 3 days (72 hours) separate the two doses. For example, if you normally inject on Sunday and want to switch to Thursday, a Thursday dose four days later is fine, and Thursday then becomes your regular day. A move to Tuesday would be too close. Your dose steps still need at least four weeks on each strength, so count those weeks from the new day.
Can I use leftover liquid in a single-dose vial?
No. The vial's Instructions for Use say to throw away all opened single-dose vials after use, even if there is medicine left in the vial. A single-dose vial is labelled for one dose only. Reusing it for a second week would also break the rule that every injection uses a new syringe and needle. Draw to the 0.5 mL line, inject, and discard the vial with whatever remains in it, then open a fresh vial next week.
How much does Zepbound cost without insurance?
Temi lists LillyDirect self-pay reference prices of $299 a month for 2.5 mg, $399 for 5 mg, and $449 for each strength from 7.5 mg to 15 mg (usetemi.com/medications/zepbound, checked 28 Sep 2026). Lilly sets those figures and they can change without notice, so confirm at checkout. A Temi clinician can prescribe the brand when it is clinically appropriate, but it is dispensed by LillyDirect rather than by Temi, and the pharmacy price is separate from any Temi fee.
Sources
- Zepbound prescribing information, Eli Lilly (revised 08/2026)
- Zepbound single-dose pen Instructions for Use, Eli Lilly
- Zepbound single-dose vial Instructions for Use, Eli Lilly (revised April 2026)
- How to use Zepbound: pen, KwikPen and vial, Eli Lilly
- Zepbound self-pay prices, Temi (checked 28 Sep 2026)
- Safely using sharps, U.S. Food and Drug Administration
Compounded semaglutide and compounded tirzepatide are not FDA-approved generics of the brand-name products. A licensed 503A compounding pharmacy prepares each one for a single prescription.
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