Zepbound (tirzepatide) comes in three devices with the same medicine and the same weekly doses. The single-dose vial holds one dose that you draw up with a syringe. The KwikPen holds four weekly doses and has a dial. The single-dose pen is an autoinjector with the needle built in. On LillyDirect, the vial and the KwikPen cost the same self-pay, $299 to $449 for four weeks as of October 19, 2026, while the single-dose pen is sold through insurance.
Here is how they differ in daily use, storage, supplies and cost.
The three devices side by side
| Single-dose vial | KwikPen | Single-dose pen | |
|---|---|---|---|
| Doses per device | 1 | 4 weekly doses | 1 |
| Strengths | 2.5 mg to 15 mg | 2.5 mg to 15 mg | 2.5 mg to 15 mg |
| Volume per dose | 0.5 mL | 0.6 mL | 0.5 mL |
| Four weeks is | 4 vials | 1 pen | 4 pens |
| Supplies | new syringe and needle every dose, bought separately | new pen needle every dose, bought separately | needle built in |
| Out of the fridge | up to 21 days in total, up to 86°F | up to 30 days, up to 86°F | up to 21 days in total, up to 86°F |
| LillyDirect self-pay | $299 / $399 / $449 | $299 / $399 / $449 | none: insurance only |
| Medicare GLP-1 Bridge | not covered | covered | not covered |
Sources: Zepbound prescribing information, the Zepbound instructions for use and LillyDirect, checked October 19, 2026. Prices are for 2.5 mg, 5 mg, and 7.5 mg to 15 mg per four weeks; the $449 price requires refilling within 45 days, otherwise $499 at 7.5 mg and $699 at 10 mg to 15 mg.
How each dose is given
The vial. You draw the dose yourself with a 1 mL syringe. The instructions start by drawing 0.5 mL of air into the syringe, and end with you pushing the plunger up “until the plunger tip reaches the 0.5 mL line.” The label says to “always use a new syringe and needle for each injection.”
The KwikPen. You attach a new pen needle, then “prime before each weekly injection.” To set the dose, you “turn the dose knob all the way until it stops,” without counting clicks. The pen will not let you dial a full dose once its four doses are used.
The single-dose pen. The needle is built in: you “press and hold the purple injection button for up to 10 seconds.” There is nothing to measure or attach.
The label notes that the KwikPen “is not recommended for self-administration by those who are visually impaired,” and that a KwikPen must never be shared between people, even with a new needle.
Storage and discard rules
All three are stored in the refrigerator. If needed, they can be kept at room temperature, no warmer than 86°F:
- Vial and single-dose pen: up to 21 days in total out of the refrigerator. Throw a vial away after you use it, “even if there is medicine left in the vial,” and a used pen into a sharps container straight away.
- KwikPen: up to 30 days. Throw it away after four doses, 30 days after first use, or 30 days at room temperature, whichever comes first, “even if there is medicine left in it.” Lilly’s instructions say: “Do not inject the leftover medicine” and “Do not transfer ZEPBOUND from your Pen into a syringe.”
What it costs, and what is included
LillyDirect sells the vial and the KwikPen self-pay at the same prices, and defines a month as 28 days: four single-dose vials or one KwikPen. Delivery is free. Supplies are not included: “For KwikPen, a new pen needle is required for each weekly injection,” and “for Vial, a new needle and syringe are required for each weekly injection” (LillyDirect).
The single-dose pen has no LillyDirect self-pay price. With commercial insurance that covers it, Lilly’s savings card can bring a fill down to as little as $25 a month (Zepbound savings terms). A full-year cost breakdown is in how much is Zepbound without insurance?, and the insurance route is in does insurance cover Zepbound?
On Medicare, the temporary Medicare GLP-1 Bridge covers only the KwikPen. CMS says “the single-dose vial and single-dose pen formulations of Zepbound® will not be available through the Medicare GLP-1 Bridge” (CMS).
A fourth device on the label
The current Zepbound label also lists a multi-dose vial holding four weekly doses. As of October 19, 2026, LillyDirect’s self-pay page sells only the single-dose vial, and we found no published price for the multi-dose vial. If one is offered later, the label’s storage rule for it matches the KwikPen’s: 30 days, or four doses.
Choosing between them
That is a conversation with your doctor, and it mostly comes down to three things:
- Comfort with needles and measuring. The vial asks you to draw an exact volume each week. The KwikPen asks you to attach a needle and prime it, with the dose set by the dial.
- Travel and storage. The KwikPen’s 30 days at room temperature gives the most room.
- How you pay. Self-pay points to the vial or the KwikPen. Insurance points to the single-dose pen. The Medicare Bridge covers only the KwikPen.
Getting Zepbound through Gentle Health
Our doctor prescribes Zepbound as single-dose vials or the KwikPen in all 41 jurisdictions where our physician is licensed, and you buy the medicine from LillyDirect at its self-pay price. You pay us $28/month for the doctor’s care, including messaging and video visits, and only once the doctor writes the prescription. There is no minimum, and you can cancel any time. We don’t prescribe the single-dose pen, and Gentle Health is not affiliated with Eli Lilly. How the process works, step by step, is in how to get a Zepbound prescription online. How our care fee compares with other online providers is on our comparison page.
Frequently asked questions
Is the Zepbound vial cheaper than the KwikPen? No. On LillyDirect they have the same self-pay prices: $299 for 2.5 mg, $399 for 5 mg and $449 for 7.5 mg to 15 mg per four weeks if you refill within 45 days, as of October 19, 2026.
How many doses are in a Zepbound KwikPen? Four weekly doses. After the fourth, the pen will not dial a full dose, and you throw it away even if some medicine is left.
How long can Zepbound stay out of the fridge? At up to 86°F, a single-dose vial or single-dose pen can be kept out for up to 21 days in total, and a KwikPen for up to 30 days.
Can I use the leftover medicine in a vial or KwikPen? No. The instructions say to throw away an opened vial after use and a KwikPen after four doses, even with medicine left, and never to move medicine from the pen into a syringe.
Which Zepbound does Medicare cover? Through the temporary Medicare GLP-1 Bridge, only the KwikPen, for eligible people, with a $50 monthly copay. The vial and the single-dose pen are not covered by the Bridge.
Dr. James Simmons, MD