Key takeaways
- Zepbound: a missed dose can be taken within four days (96 hours) of the scheduled time; after that, skip it and take the next dose on schedule. Wegovy: within five days; after that, skip.
- Never take two doses within about three days of each other; both drugs have half-lives near five to seven days and doubling up sharply increases nausea and vomiting.
- After two or more consecutive missed weekly doses, most prescribers restart at a lower dose because gastrointestinal tolerance is lost within a few weeks; the labels direct patients to consult the prescriber.
- Escalation should not resume until the previous dose is tolerated again; a gap during escalation usually means repeating the step.
- Telehealth providers handle late refills by message; a gap of more than two weeks at a high dose usually requires a clinician's decision on where to restart.
The label rules for a late dose
Both drugs are dosed once weekly and both labels answer the late-dose question directly. Zepbound and Mounjaro (tirzepatide): if a dose is missed, take it as soon as possible within four days (96 hours) of the missed dose; if more than four days have passed, skip it and take the next dose on the regularly scheduled day; do not take two doses within three days of each other. Wegovy (semaglutide 2.4 mg): take a missed dose as soon as possible within five days; if more than five days have passed, skip it and resume on the usual day. Ozempic: the same five-day rule. The day of the week can be changed if at least three days (tirzepatide) or two days (semaglutide) have passed since the last dose.
The reason for the cut-off is the pharmacokinetics. Tirzepatide's half-life is about five days and semaglutide's about a week, so a dose taken four or five days late still lands before the previous dose has worn off; a dose taken later than that, followed by the next scheduled dose, would stack two doses within a few days and produce a peak well above what the body has adapted to, which is a reliable recipe for severe nausea and vomiting.
Why gaps matter more at high doses
The four-week escalation schedule exists because gastrointestinal tolerance builds with continuous exposure. That tolerance fades when exposure stops. A patient who has been at 15 mg of tirzepatide for months and misses two weeks has, by the third week, blood levels near zero and a gut that has partly returned to baseline; a full 15 mg dose then feels like a first dose at 15 mg, which is why the labels say to consult the prescriber after multiple missed doses and why clinicians restart lower. A gap at 2.5 mg matters much less.
Restarting after a break
There is no trial of restart protocols, so practice follows the escalation logic. After a gap of one missed dose, resume the current dose on schedule. After two or three missed weekly doses, most prescribers restart one or two steps lower (for example 15 mg to 10 or 7.5 mg; 2.4 mg semaglutide to 1.7 or 1 mg) and re-escalate every four weeks as tolerated. After a month or more, most restart at or near the initiation dose (2.5 mg tirzepatide; 0.25 to 0.5 mg semaglutide) and repeat the escalation, sometimes faster than four weeks per step if the patient tolerated the drug well before. A patient who stopped for side effects restarts at the last dose that was tolerated. In every case the decision belongs to the prescriber, and the practical rule for the patient is: do not restart at your previous high dose on your own.
Weight is likely to have moved during a break, particularly one of several weeks; SURMOUNT-4 showed that regain begins within weeks of stopping. That is a reason to avoid gaps, not a reason to restart high.
Gaps during escalation
A missed dose during escalation usually means repeating the step: if week three at 5 mg is missed, most prescribers hold 5 mg for another four weeks from the resumed dose before moving to 7.5 mg. Escalation resumes when the current dose is tolerated again, not on the calendar.
What telehealth providers do
Asynchronous providers handle a late refill by message, and their protocols typically restart lower after a two-week gap; some require a check-in before they will ship. Prepaid multi-month plans keep shipping on their cadence whether or not doses were taken, which means a patient who paused should tell the provider so the dose on the next vial matches the restart plan and the dosing sheet matches the vial. The refills and shipping guide covers avoiding the gap in the first place: submit check-ins a week early, keep a dose in reserve, and when switching providers, order from the new one before cancelling the old.
The dosing-error risk on restart
A restart is when compounded-vial arithmetic goes wrong most often, because the dose changes and the vial may have changed concentration since the last fill. Recompute the volume from the concentration on the vial in hand, compare it with the provider's instructions, and use the dose calculator if the two disagree. The dosing-error article explains why a restart at "the same 50 units" from a different vial can be a double dose.
When to call rather than restart
Persistent vomiting, severe abdominal pain, signs of dehydration, or symptoms of low blood sugar after a resumed dose need a clinician the same day, whatever the schedule says. And a patient who stopped because of a pregnancy plan should not restart; both labels require discontinuation at least two months before a planned pregnancy.
Frequently asked questions
What should I do if I missed my tirzepatide dose?
If it has been four days or less since the scheduled time, take it as soon as you remember and keep your usual day. If more than four days have passed, skip it and take the next dose on the usual day. Do not take two doses within three days.
What if I missed my Wegovy dose?
Take it if five days or fewer have passed; otherwise skip it and resume on the usual day. If you miss two or more doses in a row, contact the prescriber about where to restart.
How do I restart tirzepatide after a break?
After a gap of two or more weeks, most prescribers restart one or two dose steps lower and re-escalate every four weeks, because tolerance to nausea is lost within a few weeks off the drug. After a long break, restart at the initiation dose. Your prescriber decides; do not restart at your previous high dose on your own.
Sources
- Zepbound (tirzepatide) prescribing information, Eli Lilly, 2025 (missed dose instructions).
- Wegovy (semaglutide) prescribing information, Novo Nordisk, 2025 (missed dose instructions).
- Mounjaro and Ozempic prescribing information (missed dose instructions).
- Jastreboff AM et al. SURMOUNT-1. N Engl J Med 2022;387:205-216 (dose escalation and tolerability).
- Wharton S et al. Managing the gastrointestinal side effects of GLP-1 receptor agonists in obesity. Postgrad Med 2022;134:14-19.
Citations are to primary sources (peer-reviewed trials, FDA labeling and announcements, and provider pricing pages). See our sources policy and corrections log.