Tirzepatide Overdose and Missed Dose: What the Label Says
Mounjaro and Zepbound's own overdose and missed-dose instructions, verbatim in substance, plus FDA's dosing-error warnings on compounded tirzepatide.
The short version
Mounjaro and Zepbound (tirzepatide) each carry FDA-approved instructions for a missed dose and for an overdose. A missed dose has a 4-day window; after that you skip it and resume the regular schedule. An overdose is managed with supportive care and Poison Control, not a specific antidote, because tirzepatide stays in the body for around five to six days. FDA has separately documented more than 730 adverse event reports tied to compounded tirzepatide, many linked to dosing errors.
- Both Mounjaro and Zepbound: take a missed dose within 4 days (96 hours); after that, skip it.
- Never double up on the next scheduled dose to make up for a missed one.
- Overdose management is supportive care. The label points to Poison Control, not a specific antidote.
- FDA has logged more than 730 adverse event reports tied to compounded tirzepatide specifically.
- Call 911 for severe symptoms. Call Poison Control at 1-800-222-1222 for a non-emergency suspected overdose.
Tirzepatide is sold as two FDA-approved injectable products, Mounjaro and Zepbound. Each has its own label, and both give the same answers on a missed dose and an overdose. This page states those answers, plus what FDA has separately said about dosing errors in the compounded supply. It is not instructions for a compounded or “research” vial, which has no approved label at all.
US legal status - FDA-approved · prescription only
Tirzepatide is FDA-approved as Mounjaro and Zepbound, each requiring a prescriber. A compounded or "research use only" vial is not the approved product and carries its own documented dosing-error risk - see below.
AU legal status - TGA-registered · prescription only
Tirzepatide is Schedule 4 of the Poisons Standard - prescription only.
Regulators reach their own conclusions on their own timelines. Where these two disagree, the difference is the point - not an error.
If you miss a dose
Both Mounjaro’s and Zepbound’s labels give the identical instruction: administer the missed dose as soon as possible, within 4 days (96 hours) after the missed dose. If more than 4 days have passed, skip that dose entirely. Administer the next dose on the regularly scheduled day, then resume the regular weekly schedule from there.
What the label says about overdose
There is no specific antidote for a tirzepatide overdose. Management is supportive.
That multi-day half-life means symptoms and the need for monitoring can extend well past the first day.
FDA’s warning on compounded and grey-market dosing errors
FDA has documented dosing-error problems specific to the compounded supply, separate from the approved-product instructions above. It has received reports of adverse events, some requiring hospitalization, that may be related to dosing errors with compounded injectable GLP-1/GIP products. They include patients self-administering incorrect doses and, in some cases, health care professionals miscalculating doses. FDA has also received reports tied to patients using compounded tirzepatide beyond the approved label: more product in a single dose, or a faster titration than the approved schedule allows.
As of 31 May 2026, FDA had logged more than 730 adverse event reports tied to compounded tirzepatide specifically, and states these figures are likely an undercount. A compounded vial has no FDA-reviewed concentration verification and no pen with a fixed, labelled dose. The approved products have both.
What to do right now
For a suspected overdose that is not causing those signs, call Poison Control at 1-800-222-1222 (US), free and available around the clock. Have the product packaging in hand, including whether it’s an approved pen or a compounded vial, so whoever you speak with knows exactly what was taken.
Related
- Tirzepatide: the approved label
- Tirzepatide dosage
- Semaglutide overdose and missed dose
- Peptide injection site reactions
Common questions
What happens if I miss a dose of Mounjaro or Zepbound?
Both labels give the same instruction: administer the missed dose as soon as possible, within 4 days (96 hours) after the missed dose. If more than 4 days have passed, skip that dose entirely. Administer the next dose on the regularly scheduled day, then resume the regular weekly schedule from there.
What does the tirzepatide label say about overdose?
There is no specific antidote. The label states that in the event of an overdosage, a clinician should consider contacting the Poison Help line (1-800-222-1222) or a medical toxicologist for management recommendations. Appropriate supportive treatment should be initiated according to the patient's clinical signs and symptoms. The label notes a period of observation may be necessary given tirzepatide's half-life of approximately 5 days (Mounjaro's label) to 5-6 days (Zepbound's label).
Is compounded tirzepatide more likely to cause an overdose?
FDA has documented this specifically. It has received adverse event reports, some requiring hospitalization, that may be related to dosing errors with compounded injectable GLP-1/GIP products. They include patients self-administering incorrect doses and, in some cases, health care professionals miscalculating doses. FDA has also received reports tied to patients using compounded tirzepatide beyond the approved label: more product per dose, or a faster titration than approved. As of 31 May 2026, FDA had logged more than 730 adverse event reports tied to compounded tirzepatide.
What should I do if I think I or someone else has taken too much tirzepatide?
Call 911 for severe or rapidly worsening symptoms: severe or persistent vomiting, signs of severe dehydration, fainting, or anything that feels dangerous. For a suspected overdose that is not an emergency, call Poison Control at 1-800-222-1222, free and available around the clock. Have the product in hand, including whether it is an approved pen or a compounded vial, so the person you speak with knows exactly what was taken.
Can I take a double dose to catch up after missing one?
No. The label gives a 4-day window for a late dose. Outside that window, skip the missed dose entirely and resume the regular weekly schedule at the normal dose. Do not add it onto the next one.
References (3 sources)
Bibliographic detail is fetched from PubMed, not written by me - so a citation here cannot drift from the paper it names. Study design comes from PubMed's own tags rather than my judgement.
- 1.MOUNJARO (tirzepatide) injection - full prescribing information, including the missed-dose recommendation and Section 10 Overdosage.- DailyMed, National Library of Medicinelabel
- 2.ZEPBOUND (tirzepatide) injection - full prescribing information, including Section 2.3 missed-dose recommendation and Section 10 Overdosage.- DailyMed, National Library of Medicinelabel
- 3.FDA's Concerns with Unapproved GLP-1 Drugs Used for Weight Loss - dosing errors, hospitalizations and adverse event counts for compounded semaglutide and tirzepatide.- US Food and Drug Administrationregulatory