Missed Mounjaro Dose: What to Do, Early and Late Doses Explained (November 2026)

01 · What to do

What to do if you miss a Mounjaro dose

If you miss a dose, take it as soon as you can within 4 days (96 hours) of the scheduled time, then carry on with your usual day. If more than 4 days have passed, skip the missed dose entirely and take the next one on your normal day.¹ Never take two doses within 3 days of each other.

02 · Support

Getting help

If you are unsure what to do, contact the prescribing team before you inject. Mounjaro (tirzepatide) is a prescription-only medicine, supplied only after an online consultation reviewed by a GPhC-registered prescriber. This page is information, not a substitute for medical advice. Always follow the leaflet that comes with your medicine.

03 · Worked examples

Missed dose examples

You inject on Mondays and remember on Wednesday

That is two days late, within the 4-day window. Inject on Wednesday, then go back to Mondays as normal. Your next dose is the following Monday, five days later, which keeps more than 3 days between doses.

You inject on Mondays and remember on Saturday

That is five days late, outside the 4-day window. Skip the missed dose and inject on Monday as normal.

You inject on Sundays and remember on Thursday morning

Count the hours. If more than 96 hours have passed since your usual Sunday injection time, skip it and wait for Sunday. If it is still within 96 hours, take it now and go back to Sundays.

04 · Taking a dose early

Can you take Mounjaro early?

Yes, a day or two early is fine, as long as at least 3 days (72 hours) have passed since your last dose.¹ That is useful if you are travelling or have a busy day coming up. Remember that taking a dose early effectively moves your injection day, so either carry on from the new day or move back gradually, always keeping at least 3 days between doses.

You can change your weekly injection day if needed, as long as at least 3 days (72 hours) have passed since your last dose.¹ Our guide to the best time to take Mounjaro explains how to choose and change your day.

05 · Missing several doses

What if you have missed more than one dose?

If you have missed two or more weekly doses in a row, contact the prescribing team before your next injection. After a break, your body may be less used to the medicine, so restarting at your previous dose can bring back stronger digestive side effects. The prescriber may advise restarting at a lower dose and stepping up again. Do not decide this yourself, and never take extra doses to make up for missed ones.

06 · Will a missed dose affect weight loss?

Will a missed dose affect my weight loss?

One missed or late dose is unlikely to make a lasting difference. You may notice your appetite returning slightly towards the end of the week. Getting back on schedule is what matters.

Regularly missing doses is different, because the appetite effect wears off without the medicine. Weight tends to return when tirzepatide is stopped: in SURMOUNT-4, people who stopped after 36 weeks regained on average 14% of body weight over the following year.² If you find it hard to keep to a weekly routine, set a phone reminder or link your injection to a fixed weekly habit.

07 · Missed doses and contraception

Missed doses and the contraceptive pill

Mounjaro slows stomach emptying, which can reduce how well oral contraceptive pills are absorbed.³ If you use the pill, you need a barrier or non-oral method for four weeks after starting Mounjaro and after each dose increase. If a prescriber restarts you at a lower dose after missed doses and you then step up again, the same advice applies after each increase.¹

08 · Avoiding missed doses

Tips to avoid missing a dose

• Set a weekly reminder on your phone for your injection day and time.
• Order your next pen a few days before the last dose in your current pen. Each KwikPen holds four weekly doses.¹
• Keep a simple note of each injection date and site, on paper or in your phone.
• If you travel, take your in-use pen with you; once in use, it can be kept out of the fridge not above 30°C for up to 30 days.⁴