Mounjaro dosing schedule: a late or missed weekly dose
Because tirzepatide has a long half-life, a late or missed weekly dose does not drop your levels as sharply as it might with a short-acting medication. The pharmacokinetics explain why, though decisions about timing should always be confirmed with your prescriber.
What a few days late looks like
With a 5-day half-life, levels fall gradually rather than abruptly. A dose taken a day or two later than scheduled lands while a substantial fraction of the previous dose is still present, so the dip between doses is modest. This is the same property that allows once-weekly dosing in the first place: the drug is designed to stay at meaningfully active levels across the whole interval.
A fully missed week
If an entire week is skipped, levels keep declining along the half-life curve, but even after seven extra days a meaningful fraction of the accumulated steady-state level remains, since steady state sits well above a single dose. Manufacturer guidance addresses how to handle missed doses based on how much time has passed; follow that guidance and your prescriber rather than improvising.
Using the calculator for timing questions
Enter your dose and the date and time you actually injected to see where a single dose sits on its decay curve right now. Remember this shows one isolated dose, not your accumulated level on an ongoing schedule, so it is best for visualizing the shape of the decline rather than making dosing decisions, which belong with your healthcare provider.
Not medical advice
This content is for informational purposes only. It is not a substitute for advice from a qualified healthcare professional and should not be used to make medication, dosing, or health decisions.