Mounjaro contains tirzepatide, which acts at GIP and GLP-1 receptors. It is given once weekly and is available in single-dose and multidose presentations, with different device instructions.
The approved uses and formulations described here follow US prescribing information. They may differ in other countries.
| Medicine detail | Details |
|---|---|
| Active ingredient(s) | tirzepatide |
| Medicine class | GIP / GLP-1 receptor agonist |
| Forms and strengths | Weekly injection: 2.5, 5, 7.5, 10, 12.5 and 15 mg; single-dose and multidose presentations |
Approved uses in the United States
Mounjaro is approved alongside diet and exercise for glucose control in adults and children aged 10 years and older with type 2 diabetes. It is also approved to reduce major cardiovascular events in adults with type 2 diabetes at high risk of those events.
Source: [1]
Strength and device both matter
The six injection strengths range from 2.5 to 15 mg. The current label includes single-dose pens and vials, and four-dose multidose vials and KwikPens. Dose volume differs by presentation. Pediatric and adult maximum doses also differ, so the strength range is not an instruction for every patient.
Source: [1]
The thyroid boxed warning
Tirzepatide caused thyroid C-cell tumors in rats; whether it causes these tumors in humans is unknown. Mounjaro must not be used by people with a personal or family history of medullary thyroid carcinoma or multiple endocrine neoplasia syndrome type 2 (MEN2).
Source: [1]
Other treatment considerations
Pancreatitis, serious gastrointestinal effects, dehydration-related kidney injury and gallbladder disease are among the warnings. The label advises additional or non-oral contraception for four weeks after starting and after each dose increase for people using oral hormonal contraceptives. Discuss pregnancy plans and procedures with the clinical team.
Source: [1]
Mounjaro and Zepbound
Both contain tirzepatide, but their approved uses differ. They require separate prescriptions and product-specific instructions. If the presentation supplied changes, check the product name and device with the pharmacist and ask for any training needed.
Source: [1]
Questions and answers
Can children be prescribed Mounjaro?
Its US glucose-control indication includes children aged 10 years and older with type 2 diabetes. The cardiovascular indication applies to specified adults.
Does every Mounjaro pen contain one dose?
No. The current label includes four-dose KwikPens as well as single-dose pens.
Is Zepbound simply another interchangeable Mounjaro pack?
No. The products share tirzepatide but have different approved uses and prescribing contexts.
Related reading
Sources
Sources checked 1 October 2026. This information does not replace advice from your healthcare professional. For complete warnings and instructions, read the product information and consult the prescribing team.
Reviewed by: Mattias Hagman, PhD
About the reviewer:
Dr Mattias Hagman (PhD, University of Sydney) has an academic background and experience working with healthcare-related content and regulated industries. He has lecturing experience at international universities, including Stockholm University and the University of Malta.
Last reviewed: October 2026