The windows, in one table
| Medication | Take the late dose if... | Otherwise | Minimum between doses |
|---|
| Ozempic (semaglutide) | 5 days or less since it was due | Skip; resume on schedule | 48 hours |
| Wegovy (semaglutide) | 5 days or less since it was due | Skip; resume on schedule | 48 hours |
| Zepbound (tirzepatide) | 4 days (96 hours) or less | Skip; resume on schedule | 72 hours |
| Mounjaro (tirzepatide) | 4 days (96 hours) or less | Skip; resume on schedule | 72 hours |
Two principles cover almost every situation: inside the window, take it and keep your original day; outside it, skip and never double. The spacing minimums (48 hours for semaglutide, 72 for tirzepatide) are also the legal move for permanently changing your shot day: shift once, respecting the gap, then stay on the new day.
What one missed week does to your level
Less than the anxiety suggests. Semaglutide's half-life is about 7 days, tirzepatide's about 5, so a single skipped week leaves a meaningful fraction of the drug still working, and the weight effect lags the blood level by more than that. The washout calculator draws your actual curve if you want to see the shape of it. The practical translation: one missed dose is a dip, not a cliff, and panic dosing to compensate causes more trouble than the dip does.
The longer gap: when the restart question appears
Somewhere past two missed doses, the question changes from "when do I take it" to "at what dose do I come back." The Wegovy label handles this directly: after 2 or more consecutive missed doses, either resume as scheduled or restart the dose escalation, at the prescriber's judgment. The mechanism behind that option is GI tolerance: the gut adapted to your dose while the level was steady, and it un-adapts as the drug clears. A full maintenance dose landing after a month away can feel like the worst of the nausea weeks compressed into one. Where your restart should land is exactly the ladder conversation the dosage chart maps.
The gap week is data. Around day 10 to 14 without a dose, many people notice the first flickers of what the medication was holding back: appetite arriving earlier, portions needing deciding instead of self-limiting, the first murmurs of food noise. If that is happening to you right now, write down what you notice and when. It is the most honest preview you will ever get of what stopping feels like, and it is exactly the information a real exit plan is built from.
If the missed dose was not your choice
Pharmacy stockouts, insurance lapses, and pens that cost too much to refill produce the same gap as forgetfulness, with more dread attached. Two pages exist for that situation: the affordability guide for the paths that keep legitimate medication in reach, and what happens when you stop if the interruption is turning into an ending. An unplanned gap handled with a plan beats a planned taper handled with denial.
Frequently asked questions
I missed my Ozempic dose. How late can I still take it?
The Ozempic and Wegovy labels give semaglutide a 5-day window: if it has been 5 days or less since the missed dose was due, take it as soon as you can and keep your original schedule. Past 5 days, skip it and take the next dose on the regular day. Tirzepatide (Zepbound and Mounjaro) gets a 4-day window on its labels, with the same skip rule after it closes.
Can I take two doses close together to catch up?
No, and the labels are specific about minimum spacing: semaglutide doses must be at least 48 hours apart, tirzepatide doses at least 72 hours apart. Doubling up compresses a week of drug into a shorter window, and the gut is where you would feel that. If the schedule is tangled, the untangling belongs to your prescriber or pharmacist.
How do I change my shot day permanently?
The same spacing rules are the mechanism. Semaglutide: pick any new day as long as the gap between the last dose and the new day is at least 48 hours. Tirzepatide: at least 72 hours. Move the day once and stay there; the labels support this and it is a common, low-drama adjustment.
I have been off it for 3 weeks or more. Do I just restart at my old dose?
This is a prescriber call, not a label lookup. The Wegovy label addresses longer gaps directly: after 2 or more consecutive missed doses, resume as scheduled or restart the escalation ladder to limit gut side effects, at the prescriber’s judgment. The practical reason is that GI tolerance fades as the drug clears, so a full dose landing on a re-sensitized gut can feel like week one all over again, or worse. The longer the gap, the stronger the case for stepping back up.
Does missing one dose undo my progress?
No. With a 7-day half-life (semaglutide) or 5-day half-life (tirzepatide), one missed week drops your drug level meaningfully but nowhere near zero, and the weight effect moves slower than the blood level. What one gap week can do is preview what a lower level feels like: appetite creeping up, portions less self-limiting. That is information, not damage.
Sources
- Ozempic prescribing information: Ozempic (semaglutide) full prescribing information, via DailyMed (NIH).
- Wegovy prescribing information: Wegovy (semaglutide) full prescribing information, via DailyMed (NIH).
- Zepbound prescribing information: Zepbound (tirzepatide) full prescribing information, via DailyMed (NIH).
- Mounjaro prescribing information: Mounjaro (tirzepatide) full prescribing information, via DailyMed (NIH).
- Missed-dose windows, minimum dose spacing, and the post-interruption reinitiation option restate the current FDA prescribing information for each product. Labels are revised; edge cases belong to your prescriber or pharmacist.
Linked citations open on PubMed or DailyMed, both run by the US National Institutes of Health. Where a claim on this page comes from reporting or clinical commentary we could not resolve to a stable public record, it is listed above without a link rather than pointed at an approximation.