If you're on Zepbound (tirzepatide), the injection itself is the easy part. The hard part is the rhythm: remembering which week you're in, which dose you're on, and which day you actually injected. This guide covers the US dose ladder, the missed-dose rules from the FDA label, the three formats Zepbound comes in, and a simple way to keep every week on track.

Who Zepbound is for

Zepbound is Eli Lilly's brand of tirzepatide, a once-weekly injection. In the US it's approved for chronic weight management in adults with obesity (or overweight with a weight-related condition), and for moderate-to-severe obstructive sleep apnea in adults with obesity.

One naming quirk trips people up constantly. Tirzepatide is sold under two brands in the US: Zepbound for weight loss and sleep apnea, and Mounjaro for type 2 diabetes. Same molecule, different label. (In the UK, confusingly, Mounjaro is the weight-loss brand too, so ignore any dosing advice written for a UK audience about pen formats.)

The dose ladder (2.5 to 15 mg)

Everyone starts at the bottom and steps up slowly. That slow ramp is deliberate: it gives your body time to adjust so nausea stays manageable. Per the US label:

Each increase is 2.5 mg, and you stay at least 4 weeks on a dose before moving up. The label's recommended maintenance doses for weight loss are 5, 10, or 15 mg; the 7.5 and 12.5 mg strengths are mainly stepping stones between them. You don't have to climb all the way to 15 mg. Plenty of people stay at 5 or 10 mg because it's working and the side effects are tolerable. Your prescriber decides if and when you move up.

Pen, KwikPen, or vial

Zepbound comes in three formats in the US, and it's worth knowing which one you have because the routine differs:

• Single-dose pen: the original auto-injector. One pen, one dose, then it goes in the sharps container. A month's supply is a box of four pens. This is the format most people get through insurance.
• Four-dose KwikPen: approved by the FDA in January 2026 and available since late February 2026. One pen holds a full month (four weekly doses of the labeled strength). A little liquid left after the fourth dose is normal; don't try to squeeze out a fifth. It launched through LillyDirect self-pay and has since reached major pharmacies.
• Single-dose vials: sold through LillyDirect's self-pay program. You draw each dose up with a supplied syringe. A month's supply is four vials. Cheaper, but a bit more hands-on.

If you're tracking doses, log the format too. "Third dose from this KwikPen" and "third vial of four" are useful things to know when you're standing in front of the refrigerator wondering whether to reorder.

Missed doses and changing your day

The FDA label is specific here, which is helpful because this is the question everyone eventually has:

• Within 4 days (96 hours)? Take the missed dose as soon as possible, then carry on with your usual weekly day.
• More than 4 days late? Skip it. Take your next dose on the regularly scheduled day.
• Safety gap: never take two doses within 3 days (72 hours) of each other.

Changing your injection day: allowed. Say you want to move from Monday to Friday because Mondays are chaos. That's fine, as long as at least 3 days pass between the last dose and the next one. Travel across time zones follows the same logic: anchor to a consistent weekly day in your local time and keep the 3-day gap when shifting.

Storage and travel

• Store pens and vials in the refrigerator at 36°F to 46°F (2°C to 8°C).
• If needed, single-dose pens and vials can sit at room temperature (up to 86°F / 30°C) for up to 21 days.
• Once a single-dose pen or vial has been at room temperature, don't put it back in the refrigerator. Use it within the 21 days or discard it.
• The four-dose KwikPen runs on a different clock: in use, it can live in the refrigerator or at room temperature, but throw it away 30 days after first use or after the fourth dose, whichever comes first.
• Never use Zepbound that's been frozen. Keep it in the original carton to protect it from light.

Flying somewhere for two weeks? You're fine. Pack it in your carry-on (never checked baggage, the hold can freeze), and the 21-day window (30 for a KwikPen) covers the whole trip. Just note the date it left the refrigerator, because that's a fact you will absolutely forget by day ten.

What it costs

Quick version, as of July 2026, because US pricing has changed twice this year alone:

• List price: around $1,086 a month, which almost nobody actually pays.
• LillyDirect self-pay: $299 a month for 2.5 mg, $399 for 5 mg, and $449 for 7.5 mg and up, in vials or the KwikPen. One catch on the higher doses: to keep the $449 price for 7.5 mg and above, each refill has to land within 45 days of your last delivery, or the price reverts to a much higher standard rate ($599 to $1,049 depending on dose). The 2.5 and 5 mg prices have no refill deadline. Another reason accurate dose tracking pays for itself.
• Commercial insurance: with coverage plus Lilly's savings card, as low as $25 a month. The card legally excludes anyone on Medicare, Medicaid, or TRICARE.
• Medicare: from July 1, 2026, the Medicare GLP-1 Bridge gives eligible Part D enrollees the Zepbound KwikPen at a flat $50 monthly copay, through the end of 2027.

Verify current numbers on lilly.com before you commit; these move often.

A weekly flow that works

Pick a day and time, say Sunday at 7pm, and set the reminder. Log the injection site so you rotate properly instead of hitting the same spot on your stomach every week. Add a one-line note on how you felt. That's the whole routine, maybe thirty seconds.

Where a tracker earns its keep is the ladder view: which dose you're on, how many weeks you've been there, and when you're eligible to step up. You can attach notes like "nausea 2/10" or "appetite way down" and bring the whole timeline to your next appointment instead of reconstructing it from memory in the waiting room. Healthcount keeps doses, weight, food, and side effects in one place, and it counts down your remaining KwikPen doses or vials so refills on the higher doses land inside that 45-day window.

FAQs

What's the Zepbound dose schedule?

2.5 mg once weekly for 4 weeks, then 5 mg. If more weight loss is needed, the dose increases in 2.5 mg steps after at least 4 weeks at each level, up to a maximum of 15 mg. Recommended maintenance doses for weight loss are 5, 10, or 15 mg.

What if I miss a dose?

Take it as soon as possible within 4 days (96 hours). Past 4 days, skip it and resume on your regular day. Never take two doses within 3 days of each other.

Can I change my injection day?

Yes. Keep at least 3 days (72 hours) between the two doses when you switch to a new weekly day.

What formats does Zepbound come in?

Single-dose auto-injector pens, a four-dose KwikPen holding a month of treatment, and single-dose vials through LillyDirect self-pay that you draw up with a syringe.

How long can Zepbound stay out of the refrigerator?

Depends on the format. Single-dose pens and vials last up to 21 days at room temperature not exceeding 86°F (30°C), and shouldn't go back in the refrigerator once they're out. The four-dose KwikPen can move between refrigerator and room temperature, but gets discarded 30 days after first use or after the fourth dose. Never use Zepbound that's been frozen.

Is Zepbound the same as Mounjaro?

Same drug, tirzepatide, but in the US the brands split by use: Zepbound for weight loss and sleep apnea, Mounjaro for type 2 diabetes.