Tracking Mounjaro (tirzepatide) injections

At a glance

What to log for Mounjaro

• The date and time of each injection — the actual one, not the scheduled one.
• The dose as printed on the pen.
• The injection site (abdomen, thigh, upper arm — per the Instructions for Use).
• Doses remaining, so the refill reminder is right.
• Side effects with the date, especially after a dose change.

What the prescribing information says about a missed dose

The prescribing information for Mounjaro says: If a dose is missed, take it within 4 days (96 hours); after that, skip it and take the next dose on the regular day. If you are unsure whether you took the dose at all, the safe default in the label is not to inject again on a guess. Decisions belong to your prescriber or pharmacist.

• Can't remember if you took your GLP-1 shot?

The pen and the record

Mounjaro's multi-dose pen has a dose counter: if it has moved since you last looked, a dose was dialed. That counter is the only physical evidence independent of memory — check it before checking your feelings about whether you injected.

Estimated medication level for Mounjaro

With a half-life of about 5 days, a weekly dose builds up over the first weeks to a plateau and falls off over weeks after stopping. EvenDose draws this as an estimated curve from your logged doses and the published half-life. It is an estimate for orientation, not a measurement, and not a basis for dose decisions.

FAQ

Sources

• Mounjaro prescribing information and Medication Guide, Eli Lilly