How to Inject Zepbound: What the Instructions for Use Say for All Four Devices

Zepbound started life as one device: a single-use autoinjector with a purple button. It is now four.

Since FDA approved a label expansion on February 23, 2026 to include a four-dose KwikPen [4], a Zepbound prescription can arrive as a single-dose prefilled pen, a single-dose vial, a multi-dose vial, or a multi-dose KwikPen. Each one has its own FDA-approved Instructions for Use. They involve different steps, different volumes, different supplies and different storage windows.

This article walks through what each of those documents says. It describes the manufacturer’s instructions; it is not instruction from us and it is not a substitute for the training the label requires before your first dose. Read the Instructions for Use that came in your own carton, and ask your healthcare provider or pharmacist about anything that does not match.

How do I tell which Zepbound device I have?

The carton and the NDC tell you [1]:

Device	Doses	Volume per dose	Supplies needed	NDC for 10 mg
Single-dose prefilled pen	1 per pen, 4 per carton	0.5 mL	Nothing extra	0002-2471-80
Single-dose vial	1 per vial	0.5 mL	Syringe and needle, sold separately	0002-1340-01
Multi-dose vial	4 weekly doses	0.6 mL	Syringe and needle, sold separately	0002-6304-11
KwikPen	4 weekly doses	Fixed, dialed	Pen needles, sold separately	0002-3533-11

Two things to notice. First, the single-dose vial and the multi-dose vial use different volumes: 0.5 mL versus 0.6 mL. Drawing 0.5 mL from a multi-dose vial would be a short dose. Second, three of the four presentations require supplies you have to obtain yourself. Vials and multi-dose KwikPens are sold exclusively through the LillyDirect self-pay pharmacy channel; the single-dose pen can also run through the insurance pharmacy component [6].

What does the label say about training when your device changes?

Before the device-by-device steps, this is the rule that ties them together. The Zepbound label instructs prescribers to inform patients which presentation they will receive and ensure they get training appropriate for that specific presentation, and then adds: “If the prescribed ZEPBOUND presentation changes, ensure patients and caregivers receive appropriate training and instruct them to consult the Instructions for Use for the newly prescribed presentation” [1].

That is not boilerplate. Moving from an autoinjector you press flat against your skin to a KwikPen you prime and dial is a real change in what you have to do, and a pharmacy or channel switch can cause it without anyone saying so.

How do you use the Zepbound single-dose pen?

This is the original device: a locked autoinjector with a gray base cap, a clear base, a lock ring and a purple injection button. The Instructions for Use, revised April 2026, describes four steps [1][3].

Step 1: Choose your injection site. You or another person can inject into the stomach (abdomen) or thigh. Another person should inject in the back of the upper arm. Change the injection site each week; you may use the same area of the body, but pick a different spot within it.

Step 2: Pull off the gray base cap. Make sure the pen is still locked. Do not unlock it until the clear base is on your skin and you are ready. Pull the gray base cap straight off and throw it away in household trash. The IFU says not to put the gray base cap back on, because that could damage the needle, and not to touch the needle.

Step 3: Place the clear base on your skin, then unlock. Put the clear base flat against your skin at the injection site, then unlock by turning the lock ring.

Step 4: Press and hold up to 10 seconds. Press and hold the purple injection button for up to 10 seconds. Listen for two clicks: the first means the injection started, the second means it completed. The IFU gives the visual confirmation as well: “You will know your injection is complete when the gray plunger is visible.”

Then the pen goes in a sharps container.

What if the Zepbound pen does not seem to have worked?

The single-dose pen IFU has an unusually helpful commonly-asked-questions section, and it answers most of what people actually search for [1]:

• Air bubbles in the pen? “Air bubbles are normal.”
• Pen not at room temperature? “It is not necessary to warm the pen to room temperature.”
• You unlocked the pen and pressed the button before pulling off the gray base cap? Do not remove the gray base cap. Throw away the pen and get a new one.
• A drop of liquid on the needle tip when the cap comes off? Normal. Do not touch the needle.
• Do you have to hold the button down the whole time? Not necessary, but it may help keep the pen steady against your skin.
• You heard three clicks, two loud and one soft? “Some people may hear a soft click right before the second loud click. That is the normal operation of the pen. Do not remove the pen from your skin until you hear the second loud click.”
• You are not sure the pen worked. Check whether the gray plunger is visible. If it is not, the IFU says to contact Lilly at 1-800-545-5979 for further instructions, and until then to store the pen safely to avoid an accidental needle stick.
• A drop of liquid or blood on your skin afterward? Normal. Press a cotton ball or gauze over the site. Do not rub it.

The IFU also notes the pen has glass parts and that if you drop it on a hard surface you should not use it [1].

How do you draw up a Zepbound single-dose vial?

The vial is a fixed-volume product: the whole 0.5 mL is one dose. There is no calculating and no unit conversion. What there is, is a syringe you have to supply.

The label instructs prescribers to “instruct patients using ZEPBOUND vials to use a syringe appropriate for dose administration (e.g., a 1 mL syringe capable of measuring a 0.5 mL or 0.6 mL dose) and always use a new syringe and needle for each injection” [1]. LillyDirect states “Needle and syringe purchase required” beside every vial strength and lets you add injection supplies at checkout [6].

The Instructions for Use lists the supplies: one single-dose vial, one syringe and one needle supplied separately, one alcohol swab, gauze, and a sharps container [2].

The draw sequence, in the IFU’s own order [1][2]:

1. Pull off the plastic protective cap. Do not remove the rubber stopper.
2. Wipe the rubber stopper with an alcohol swab.
3. Remove the outer wrapping from the syringe, then from the needle.
4. If the needle is separate, place it on the syringe and turn until it is tight and firmly attached. If your syringe has a pre-attached needle, skip this.
5. Remove the needle shield by pulling straight off.
6. Hold the syringe with the needle pointing up and pull the plunger down until the plunger tip reaches the line showing that 0.5 mL of air has been drawn in.
7. Push the needle through the rubber stopper.
8. Push the plunger all the way in, putting that air into the vial. The IFU explains why: it “makes it easier to pull the solution from the vial.”
9. Turn the vial and syringe upside down, keep the needle tip in the liquid, and slowly pull the plunger down until the plunger tip is past the 0.5 mL line. If there are bubbles, tap the syringe gently a few times so they rise to the top.
10. Slowly push the plunger up until the plunger tip reaches the 0.5 mL line.
11. Pull the syringe out of the stopper.

Then the injection: insert the needle into your skin, push down on the plunger, and the IFU says “the needle should stay in your skin for at least 5 seconds to make sure you have injected all of your dose.” Pull the needle out. If you see blood, press with gauze and do not rub [1][2].

Two warnings the IFU states outright: “Do not recap the needle. Recapping the needle can lead to a needle stick injury.” And “Throw away all opened vials after use, even if there is medicine left in the vial” [2].

The IFU also says your healthcare provider should tell you whether to pinch the skin before injecting, and to inject exactly as your provider has shown you [2]. That is deliberately left to the clinician rather than fixed in the document.

How is the multi-dose vial different?

Mechanically it is almost identical, with one number changed and one clock added.

Every step above applies, except that the volume is 0.6 mL, not 0.5 mL. You draw 0.6 mL of air, you pull the plunger past the 0.6 mL line, and you push it back to the 0.6 mL line [1]. The vial holds four weekly doses.

The multi-dose vial IFU also carries the rotation warning in its fullest form: “Change (rotate) your injection site within the area you choose for each dose to reduce your risk of getting lipodystrophy (pits in skin or thickened skin) and localized cutaneous amyloidosis (skin with lumps) at the injection sites.” It adds: do not inject where the skin has pits, is thickened, or has lumps; do not inject into scars or damaged skin; do not mix Zepbound with any other medicine; and do not inject it in the same site used for other medicines [1].

Reading the carton matters here in a way it does not with the single-dose vial. A multi-dose vial is labeled, for example, “40 mg/2.4 mL (16.7 mg/mL)” and delivers 10 mg per 0.6 mL injection [1]. Three numbers, one dose. The number you inject is the volume, 0.6 mL, not any of the milligram figures.

How do you use the Zepbound KwikPen?

The KwikPen is the newest device and the one with the most steps. It is a disposable multi-dose, single-patient-use prefilled pen containing four fixed weekly doses. Pen needles are not included [1][5].

Preparing. Wash your hands. Pull the pen cap straight off. Inspect the pen and label: do not use it if the medicine name or dose strength does not match your prescription, if the pen is expired or looks damaged, or if the medicine has been frozen, has particles, is cloudy, or is discolored. Zepbound should be colorless to slightly yellow. Wipe the red inner seal with an alcohol swab. Attach a new pen needle: pull off the paper tab, push the capped needle straight onto the pen and twist until tight, then pull off the outer needle shield and keep it — it gets reused — and pull off the inner needle shield and put it in household trash [1].

Priming, before every injection. This is the step people miss. The IFU says: “Prime before each weekly injection. Priming removes air from the cartridge and makes sure that your Pen is working correctly” [1].

Slowly turn the dose knob until you hear two clicks and the extended line shows in the dose window. Hold the pen with the needle pointing up and tap the cartridge holder gently to collect air bubbles at the top. Push the dose knob in until it stops, then slowly count to 5 while holding the knob. A small drop of medicine should come out of the needle tip. If you do not see medicine, repeat up to two more times; then change the pen needle and repeat once more; and if you still see nothing, contact Lilly at 1-800-545-5979 [1].

Dosing. Turn the dose knob all the way until it stops and the icon is in the dose window. The IFU is emphatic: “Do not count clicks as you select the dose” [1].

Injecting. Insert the needle into your skin. Push the dose knob in until it stops, then slowly count to 5 while still holding it. The icon must be shown in the dose window before you remove the needle. Pull the needle out — a drop on the tip is normal and does not affect your dose [1].

Confirming. If the icon is in the dose window, you received the full dose. If it is not, the IFU says to insert the needle back into your skin and finish the injection, and specifically: “Do not redial the dose.” If you still do not think you received the full dose, “do not start over or repeat the injection,” and go to the troubleshooting section [1].

After. Carefully replace the outer needle shield, unscrew the capped needle, and put it in a sharps container. Do not store the pen with the needle attached — the IFU says this prevents leaking, blocked needles and air entering the pen. Replace the pen cap; do not store the pen without it [1].

What does the KwikPen troubleshooting section say?

Short and specific [1]:

• Cap will not come off. Gently twist it back and forth, then pull straight off.
• Dose knob is hard to push. Push more slowly. Or the needle may be blocked: fit a new pen needle and prime. Or there may be dust, food or liquid inside the pen, in which case throw it away and get a new one.
• The pen will not let you turn the knob to a full dose. Throw the pen away, including the unused medicine. There may not be enough left for a full dose. “Do not attempt to inject the leftover medicine.”

And a rule that is easy to get wrong: after four doses, discard the pen including any remaining medicine. The pen will prevent you from dialing a full dose once four weekly doses have been given. “Do not transfer ZEPBOUND from your Pen into a syringe” [1].

Where should you inject Zepbound, and who can use the arm?

Section 2.4 of the label says: “Inject ZEPBOUND subcutaneously in the abdomen, thigh, or another person should inject in the back of the upper arm. Rotate injection sites with each dose” [1].

That phrasing is deliberate, and it differs from the Novo Nordisk products. The Ozempic and Wegovy labels let a patient inject their own upper arm. Zepbound and Mounjaro reserve the back of the upper arm for another person. If you inject yourself, the label gives you two areas: abdomen and thigh.

The KwikPen IFU adds the standard abdominal clearance: inject in the thigh or stomach “at least 2 inches from the belly button,” and change the injection site each week [1].

Before every dose, the label also requires a look: “Inspect ZEPBOUND visually before use. It should appear clear and colorless to slightly yellow. Do not use ZEPBOUND if particulate matter or discoloration is seen” [1]. Slightly yellow is normal for tirzepatide. It is not normal for semaglutide, which should be clear and colorless — worth knowing if you have switched molecules.

How do you store and throw away each device?

Storage splits along the same single-dose versus multi-dose line as everything else [1]:

• Single-dose pen and single-dose vial: refrigerate at 36 to 46 °F (2 to 8 °C). If needed, store unrefrigerated at up to 86 °F (30 °C) for up to a total of 21 days, then discard. The 21 days are cumulative, not per trip.
• Multi-dose vial and KwikPen, unopened: refrigerated, usable until the expiration date. At room temperature up to 86 °F, discard after 30 days.
• Multi-dose vial and KwikPen, opened: keep in the original carton, refrigerated or at room temperature up to 86 °F. Discard after a total of 30 days at room temperature, 30 days after first use, or after four weekly doses — whichever comes first — even if medicine is left.

None of them may be frozen. All of them should stay in the original carton to protect from light.

Disposal has one genuine exception worth knowing. Single-dose pens, syringes and needles all go into a sharps container. But for the KwikPen, the IFU says: put used pen needles in an FDA-cleared sharps disposal container right away, and “discard the used Pen in your household trash or FDA-cleared sharps disposal container after you have removed the needle” [1].

That household-trash allowance for the empty pen body is subject to your local rules. FDA’s guidance is that used sharps containers should not go in household trash unless community guidelines permit it, and that state and local laws vary [5]. Some states do not allow sharps in household trash at all.

The bottom line

Four devices, four procedures, three different in-use clocks, and three of the four requiring supplies you buy separately. That is a lot of surface area for a mistake that has nothing to do with the drug.

One habit covers most of it: read the Instructions for Use in the carton you were handed, every time the carton looks different, and treat a device change as a reason to ask for training. That is what the label asks for too.

Sources

1. Eli Lilly and Company. ZEPBOUND (tirzepatide) injection — US Prescribing Information, Medication Guide, and Instructions for Use for the single-dose pen (revised April 2026), single-dose vial (April 2026), multi-dose vial (January 2026) and KwikPen (January 2026). https://uspl.lilly.com/zepbound/zepbound.html
2. Eli Lilly and Company. Instructions for Use — ZEPBOUND (tirzepatide) injection, single-dose vial. https://pi.lilly.com/us/zepbound-vial-us-ifu.pdf
3. Eli Lilly and Company. Dosing, How to Use & How to Inject Zepbound (tirzepatide). https://zepbound.lilly.com/weight/how-to-use
4. Eli Lilly and Company, via Drugs.com. “Zepbound (tirzepatide) Now Available in Multi-Dose KwikPen,” February 23, 2026. https://drugs.com/newdrugs/zepbound-tirzepatide-now-available-multi-kwikpen-6730.html
5. US Food and Drug Administration. Best Way to Get Rid of Used Needles and Other Sharps. https://www.fda.gov/medical-devices/safely-using-sharps-needles-and-syringes-home-work-and-travel/best-way-get-rid-used-needles-and-other-sharps
6. Eli Lilly and Company. Authentic Zepbound (tirzepatide) Shipped to You — LillyDirect. https://www.lilly.com/lillydirect/zepbound