Zepbound Vials and Syringes: How the Vial Works and What It Costs

Zepbound comes in a single-dose vial that you draw up with your own syringe, sold only through Lilly’s LillyDirect pharmacy and only to people paying cash. Each vial holds one weekly dose in 0.5 mL, from 2.5 mg to 15 mg, and a month is four vials. On October 31, 2026, LillyDirect’s monthly price for the vial was $299 for the 2.5 mg starter, $399 for 5 mg, and $449 for any higher strength, the last on condition that each refill comes within 45 days.^[2] The FDA label’s Instructions for Use describe the injection in 16 steps, and the main difference from the pen is that you measure the dose yourself.^[1]

Three ways Zepbound is packaged

The label now lists four presentations: a single-dose autoinjector pen, a single-dose vial, a multi-dose vial and a four-dose KwikPen.^[1] LillyDirect sells three of them. The multi-dose vial, which holds four weekly doses of 0.6 mL each, is on the label but was not offered on Lilly’s page when we read it.^[2]

Doses available in the vial

Every single-dose vial holds 0.5 mL. What changes between strengths is the concentration, so the volume you draw is the same at every dose: 2.5, 5, 7.5, 10, 12.5 or 15 mg.^[1] Everyone begins on the 2.5 mg vial for the first month, a strength the label says “is not approved as a maintenance dosage,” and then goes to 5 mg. Further increases come in 2.5 mg steps, with no less than four weeks on each, and the label names 5, 10 and 15 mg as the doses to stay on. Nothing above 15 mg is approved.^[1] How the trial results differed across those three doses is set out in which Zepbound dose works best.

Because the volume never changes, drawing a smaller amount out of a higher-strength vial to make a lower dose is not something the label describes. Each vial is labeled for one dose, and the Instructions for Use say to throw away an opened vial after use “even if there is medicine left in the vial.”^[1] Lilly’s medical information service adds that the vial contains no preservative.^[3]

Which syringe to use

The vial comes without a syringe or needle. The label tells prescribers to have patients use “a 1 mL syringe capable of measuring a 0.5 mL or 0.6 mL dose” and a new syringe and needle for every injection.^[1] The Instructions for Use leave the exact syringe and needle to your healthcare provider.

Lilly’s medical information answer on the question is more specific. It says the 0.5 mL dose may be given with a 1.0 mL syringe and a needle between 29 and 33 gauge, up to 12.7 mm long, and that shorter 6 mm needles can be used in all adults. It also addresses insulin syringes directly: on a 1 mL syringe made for U-100 insulin, the 50-unit mark equals 0.5 mL.^[3] The same answer warns that U-40, U-80 and U-500 syringes would give a different reading, so check the “U-100” marking on the package. Our units-to-milligrams guide explains why the units on a syringe say nothing about milligrams until you know the vial’s concentration.

How the vial injection works, step by step

The Instructions for Use break the injection into three stages. In summary:^[1]

1. Check the vial. Take it out of the refrigerator and confirm the medicine and dose on the label and the expiration date. The liquid should not be frozen or cloudy, should be colorless to slightly yellow, and should have no particles. Wash your hands.
2. Prepare. Pull off the plastic cap but leave the rubber stopper in place, and wipe the stopper with an alcohol swab. Attach the needle to the syringe if it is not already attached, and pull the needle shield straight off.
3. Add air. With the needle pointing up, pull the plunger back to the 0.5 mL line, push the needle through the stopper, and push the plunger all the way in. The label explains that the air makes the liquid easier to draw.
4. Draw the dose. Turn the vial and syringe upside down, keep the needle tip in the liquid, and pull the plunger slowly to just past the 0.5 mL line. Tap out any bubbles, then push the plunger back up to exactly 0.5 mL and withdraw the needle.
5. Inject. Choose a site in the stomach area or thigh (another person can also use the back of the upper arm), insert the needle, and push the plunger down. Leave the needle in for at least 5 seconds so the full dose goes in, then pull it out. Press with gauze if there is blood, but do not rub.
6. Dispose. Do not recap the needle. Put the syringe and needle straight into an FDA-cleared sharps container, and throw the vial away even if liquid is left.

Rotate the injection site within the area each week, and avoid skin that is pitted, thickened, lumpy, bruised or scarred.^[1] The site-by-site detail is in where to inject a GLP-1.

How it differs from the pen

The single-dose pen hides the needle and measures the dose for you. You place its clear base flat on the skin, unlock it by turning a ring, and press and hold the button for up to 10 seconds; the label says the first click means the injection has started and the second means it is done.^[1] With the vial, the measuring is your job, and so is buying syringes and a sharps container. The KwikPen sits between the two: four doses in one pen, a new pen needle each week, a small priming step before each dose, and a dose knob you turn until it stops. Its instructions say not to transfer Zepbound from the pen into a syringe. The label does not recommend the KwikPen for self-injection by people who are visually impaired.^[1] For KwikPen users, the Zepbound pen dose chart lists the doses and prices for each pen.

What the vial costs

The lower price on the four highest doses holds only while each new order follows the last one by 45 days or less; let the gap run longer and the regular price applies, $499 at 7.5 mg and $699 above it.^[2] Lilly defines a month as 28 days, so thirteen fills cover a year. Syringes and needles are extra and are not priced on the page. The KwikPen is listed at the same prices for the same doses.^[2] How these figures compare with every other route is in TrumpRx and the manufacturers’ cash prices.

How to get Zepbound vials

You need a prescription sent to LillyDirect Pharmacy. Lilly’s page lists the pharmacy’s NPI and address for prescribers and says a pharmacy partner then contacts you to confirm the order and delivery or pickup.^[2] Because the vial is self-pay only, insurance plays no part in its price. That also shapes what government coverage will touch. The Medicare GLP-1 Bridge covers Zepbound only as the KwikPen, as our Medicare Bridge guide explains.^[4] TRICARE’s pharmacy committee keeps the vials in “complete exclusion status” because the formulation is sold only for self-pay; the rest of TRICARE’s rules are in GLP-1 coverage under TRICARE and federal plans.^[5]

Storing the vials

Unopened single-dose vials belong in the refrigerator at 36°F to 46°F, in the carton to keep out light. When you need to, a vial can sit outside the fridge for 21 days in all, never above 86°F, and then it goes in the bin. A vial that has frozen is not used.^[1] The same window applies to the single-dose pen; the four-dose devices get 30 days. The full comparison across brands is in how long GLP-1 pens can be out of the fridge.

Common questions