The short version
If you’re inside your drug’s window, take the missed dose now and keep your regular day. If you’re past it, skip that dose entirely and take the next one on schedule. Never double up. That’s the whole rule, and the only thing that varies between medications is how wide the window is.
It varies more than most people expect. Here’s every window in one place:
| Medication | Schedule | Take it if you’re within | Past that |
|---|---|---|---|
| Zepbound | Weekly | 4 days (96 hours) after the missed dose | Skip; next dose on the regular day |
| Mounjaro | Weekly | 4 days (96 hours) after the missed dose | Skip; next dose on the regular day |
| Ozempic | Weekly | 5 days after the missed dose | Skip; next dose on the regular day |
| Wegovy injection | Weekly | measured from the next dose: take it if that dose is more than 2 days away, which is up to 4 days late | Skip; next dose on the regular day |
| Trulicity | Weekly | measured from the next dose: take it if that dose is at least 3 days away, which is up to 4 days late | Skip; next dose on the regular day |
| Saxenda | Daily injection | no catch-up window | Resume the once-daily schedule at your next dose |
| Victoza | Daily injection | no catch-up window | Resume the once-daily schedule at your next dose |
| Wegovy tablets | Daily tablet | no catch-up window | Skip; take the next one the following day |
| Rybelsus | Daily tablet | no catch-up window | Skip; take the next one the following day |
| Foundayo | Daily tablet | take it as soon as you can | Do not double up on the next dose |
Two of these are not the same kind of rule, and the difference is easy to miss. Ozempic, Mounjaro and Zepbound count forward from the dose you missed. Wegovy injection and Trulicity count backward from your next dose, which is why their entries read differently. Both work out to about four days late on a seven-day schedule, but the label wording is not interchangeable, and restating Wegovy’s as “within 2 days of when it was due” more than halves the real window.
Note the spread among drugs that are chemically identical. Ozempic and Wegovy injection are both semaglutide and their rules are not even the same shape. The window isn’t a property of the molecule, it’s what each individual label says, which is why the tool asks for the brand rather than the drug class. Wegovy injection and Wegovy tablets make the point hardest: they sit on the same label with opposite instructions.
Why the windows are different lengths
Two things set them. The first is half-life: semaglutide and tirzepatide both stay in your system for around five days, which is what makes a once-weekly schedule work at all and what gives a late dose room to be absorbed without stacking on the next one. The second is what the manufacturer studied and submitted. A shorter published window isn’t necessarily a statement that day 3 is dangerous; it can simply be the boundary the label committed to.
For the daily drugs the logic is different and simpler. When the next dose is tomorrow, there’s no window worth defining, so you skip and carry on.
Taking a late dose doesn’t move your schedule
A common misread. If your dose is due Sunday and you take it Tuesday, your next dose is still the following Sunday, not the following Tuesday. The schedule is the anchor; the late dose is the exception.
There’s a separate rule for deliberately changing your injection day, which is not the same thing as being late. Most weekly labels allow it as long as you leave enough time between doses, commonly at least 72 hours. If you want to move your shot from Sunday to Wednesday permanently, that’s the rule you’re following, and it’s worth confirming with your prescriber rather than assuming.
When a gap means restarting the titration
This is where “take it or skip it” stops being sufficient.
Wegovy’s label is the explicit one. Miss more than two consecutive weekly doses and it says to consider reinitiating at a lower dose and re-escalating, or to contact your prescriber. Don’t resume at 2.4 mg after a month off.
Zepbound, Mounjaro, and Ozempic set no restart rule. That silence gets misread as permission. What’s actually true is that gut tolerance is built by the slow step-up you did at the start, and it fades when the drug does. Come back after several weeks at the dose you left off at and the nausea that took you two months to get past can return in full. Prescribers routinely restart lower for exactly this reason. Since the label doesn’t decide it, someone has to, and it should be them rather than the pens in your fridge.
Saxenda and Victoza are the strictest, because they’re daily. Three or more missed days and both labels say to reinitiate at 0.6 mg and titrate back up.
When to stop reading and call
Some situations aren’t a lookup:
- You’ve missed more than two doses in a row. Restarting safely is a dosing decision.
- You take it for type 2 diabetes. A gap in Ozempic, Mounjaro, Trulicity, or Victoza is a gap in glucose control, especially if you’re also on insulin or a sulfonylurea. Check your readings and report what you see.
- You don’t remember whether you took it. Take nothing and call. An accidental double dose is a worse outcome than a missed one.
- Side effects come back hard on restarting. That usually means the dose is too high for where your tolerance now sits.
- You’re missing doses because of cost or supply. Say so out loud. There are usually options, and rationing a titration schedule is the worst of them.
Preventing the next one
Most missed doses are logistics, not intent. Injecting on the same day each week, keeping the pen somewhere you’ll physically see it, and setting a repeating reminder handles the majority. Writing each dose down as you take it removes the “did I?” problem entirely, and the medication tracker is built for that, and the dosage charts show where each dose sits in the wider titration.
This page reports what prescribing information says. It is general education, not medical advice, and your prescriber’s instructions for you come first.