You missed a dose. Now what?
The rules differ by product, and they hinge on how many days have passed. Here is the decision for each medicine, in the order you actually need it.
The short version
- For weekly injections, the usual cut-off is about 4–5 days: inside it, take the dose; outside it, skip and resume on schedule.
- Never take two doses close together to catch up.
- If several weeks are missed, the escalation may need to restart lower — the gut loses tolerance faster than it gained it.
- These are the label rules. Your prescriber's instruction outranks them.
Missed doses are ordinary. Travel, a pharmacy that did not have stock, a week that got away from you. The medicines in this class are unusually forgiving about it, because of how slowly they clear — but the specific rule differs by product, and it is worth knowing before the moment arrives.
Weekly injections
| Product | If you remember within | If longer |
|---|---|---|
| Ozempic®, Wegovy® semaglutide |
5 days — take it as soon as you remember | Skip it. Take the next dose on your normal day. |
| Mounjaro®, Zepbound® tirzepatide |
4 days — take it as soon as you remember | Skip it. Take the next dose on your normal day. |
| Trulicity® dulaglutide |
3 days — take it as soon as you remember | Skip it. Take the next dose on your normal day. |
In every case, there must be at least three days between the late dose and the next scheduled one. If taking the late dose would leave less than that gap, skip it instead.
Do not double up. Two doses close together stack on a level that has not fallen, and the result is a much larger effective dose than intended. This is the most common self-inflicted cause of severe nausea and vomiting in people on these medicines.
Daily products
For Saxenda® and Victoza® (liraglutide), skip the missed dose entirely and take the next one at the usual time. Do not take an extra dose to make up.
Because liraglutide clears in a few days, a gap of more than three days means tolerance has faded. Prescribers commonly restart at a lower dose and re-climb, rather than resuming at the dose you were on.
For Rybelsus® (oral semaglutide), skip the missed tablet and take the next one the following day. Do not take two tablets on the same day.
When the gap is long
A single missed week on a weekly injection usually needs no adjustment at all. Several consecutive weeks is a different situation: blood levels have fallen substantially, and gastrointestinal tolerance goes with them. Resuming at your previous dose after a long gap frequently reproduces the side effects of your first escalation, at full strength.
This is a conversation to have before restarting, not after. Prescribers often step back one or two rungs and rebuild.
Changing your injection day. You can move the day if you need to, provided there are at least three days between the last injection and the next. Establish the new day and keep it — a fixed day is what makes missed doses rare in the first place.
The arithmetic behind the windows
The windows above are not arbitrary. They follow from how fast each drug leaves the body, and seeing the numbers once makes the rules easy to remember.
Semaglutide's half-life is about seven days. That means on the day your next injection is due, roughly half of the previous dose is still present. Two days later, around 80% of the level you would have had is still there. A dose taken three days late lands on a foundation that has barely moved — which is why a five-day window is safe rather than generous.
Tirzepatide clears faster, at about five days, so the same three-day delay leaves less behind. Dulaglutide's window is tighter again. The pattern is consistent: the faster a drug clears, the less room there is for lateness.
Why doubling up is the one genuine danger
Everything else on this page is a matter of a slightly lower level for a few days. Taking two doses close together is different in kind.
Because levels fall slowly, the previous dose is still largely present. A second dose does not replace it — it adds to it. The effective dose is closer to the sum than to either one alone, and the gut effects scale with it. People who do this describe an experience considerably worse than any dose increase, often lasting several days, and it is the most common self-inflicted reason for an emergency appointment on these medicines.
The rule is unconditional. There is no situation in which taking two doses to catch up is correct.
Missed doses and how well the treatment works
A single missed dose changes very little. Levels dip and recover, and the months-long trajectory is essentially unaffected.
A pattern of missed doses is a different matter, and it fails quietly. Three or four gaps across a few months keep blood levels oscillating below where the schedule intends them to be. Nothing dramatic happens; the treatment simply underperforms, and it is very easy to conclude that the medicine is not working when what is not working is the schedule.
This is why the fixed day matters even though any individual week is forgiving. The forgiveness applies per occasion. It does not accumulate.
Forgetting versus running out
These look the same on a calendar and are entirely different problems.
Forgetting is solved by a fixed day and a reminder that survives a bad week. Running out is a supply problem — a lapsed prescription, a pharmacy without stock, an authorisation that expired — and it is solved weeks earlier, by knowing your run-out date rather than discovering it.
If your missed doses have been supply failures, a better memory will not help. Counting the doses left in the fridge and reordering before the last one will.
Travel and time zones
For weekly products, time zones are irrelevant. Keep the same calendar day and inject at whatever local time suits; a few hours either way disappears into a week-long half-life. For daily products, aim for roughly the same local time and let the shift settle over a day or two rather than holding the original clock.
The genuine travel risks are supply and storage rather than timing: carrying the pen in hand luggage, keeping it out of a hot car, and taking more than you strictly need in case the journey extends.
Building a routine that does not fail
- Choose the day for the week you actually have. Symptoms tend to peak in the days after a dose, so a day whose following evening is usually quiet beats a day that is merely easy to remember.
- Use a recurring alarm, not an intention. The weeks you miss are the weeks everything else went wrong, which is exactly when intentions fail.
- Write down the date. Almost every "did I take it?" question comes from not having recorded the answer.
- Know your run-out date. Count forward from what is in the fridge and reorder with a week to spare.
None of this is sophisticated. It is, however, the difference between a treatment that delivers what the trials suggested and one that quietly does not.
Sources
- Zepbound® dosage, schedules and missed doses. Eli Lilly and Company.
- Zepbound® dosage guide. Drugs.com.
- US Prescribing Information for Ozempic®, Wegovy®, Rybelsus®, Trulicity®, Saxenda® and Victoza®.
Related
- Dose schedules, drug by drug — Every GLP-1 medicine climbs a ladder of doses on a fixed timetable. Here is every schedule in one place, and the reasoning behind the pace.
Which medicine you are on
Everything above applies across the class, because it comes from a shared mechanism. The numbers that differ — dose ladders, missed-dose windows, in-use storage periods, half-lives — differ by product, sometimes substantially. Each medicine has its own reference here:
Ozempic · Wegovy · Mounjaro · Zepbound · Rybelsus · Saxenda · Victoza · Trulicity · all medicines
How this page is sourced. Figures come from manufacturers' approved labelling and from published clinical and pharmacokinetic literature. Regional labels differ, sometimes materially — where a number matters, the leaflet in your own box outranks anything written here. This site is not written or medically reviewed by clinicians, and we say so rather than implying otherwise; our editorial standards set out what that means and how corrections work.