Mounjaro (tirzepatide): the 2026 buyer's guide
Mounjaro is Eli Lilly's once-weekly tirzepatide injection, FDA-approved in 2022 for type 2 diabetes. Mounjaro and Zepbound are the same active molecule (tirzepatide) at the same doses; the difference is approved indication. Off-label Mounjaro prescribing for weight loss was widespread 2022-2023 before Zepbound launched. Below: trial efficacy, 2026 pricing and how it compares to Zepbound for weight loss patients.
Compare Mounjaro prices →- Mounjaro is a weekly injection of tirzepatide, FDA-approved for type 2 diabetes since 2022.
- In the SURPASS-2 trial, mean weight loss was 13.1% over 40 weeks, with 40% of patients losing 15% or more of body weight.
- It carries the GLP-1 class boxed warning for thyroid C-cell tumor risk, and is not for people with a personal or family history of medullary thyroid carcinoma or MEN2.
- Cash, insurance and compounded prices differ widely. See the cost breakdown below, and the all-in program costs on the chart.
What Mounjaro costs in 2026
There is no one price. What you pay depends on which path you take:
Telehealth programs add a membership fee on top of the medication cost (typically $40-$200/mo). For all-in monthly costs by program, see the chart, the full GLP-1 cost guide, or calculate your exact all-in cost by drug, coverage and state.
Who it's for
Adults with type 2 diabetes, as an adjunct to diet and exercise. Frequently prescribed off-label for weight loss before Zepbound's late-2023 approval; off-label prescribing for weight loss has narrowed since Zepbound launched.
What the trials show
Mounjaro's registration trial was SURPASS-2 (NEJM, 2021). At 40 weeks at the maximum dose, mean weight loss was 13.1% (6.4 percentage points greater than semaglutide 1mg). 86% of patients lost at least 5% of body weight; 40% lost at least 15%. Real-world results vary; trial patients are typically more adherent and more closely managed than typical telehealth patients.
Dose schedule
Dose levels: 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg, 15mg. Standard practice is to titrate up monthly, holding at any tolerated dose. Maximum dose is 15mg weekly; many patients reach goal weight at sub-maximum doses and stay there.
Common side effects
The most commonly reported side effects in the registration trial:
- nausea (22%)
- diarrhea (16%)
- decreased appetite (10%)
- vomiting (8%)
- constipation (7%)
Boxed warning: Risk of thyroid C-cell tumors (rodent data); contraindicated in patients with personal or family history of medullary thyroid carcinoma or MEN2 syndrome.
How Mounjaro differs from related drugs
Same molecule as Zepbound at the same doses. Approved for diabetes, not weight loss. For US patients without diabetes, Zepbound is the indicated option and the simpler insurance path; Mounjaro for weight loss is off-label and rare in 2026.
Compounded tirzepatide
Compounded tirzepatide is the same active molecule prepared by a 503A pharmacy under prescription rather than manufactured under FDA new-drug approval as Mounjaro. Cash-pay savings versus branded Mounjaro are typically 50-80%. The regulatory environment has tightened. Briefly on FDA shortage list early 2024, off the list since late 2024. Off-label prescribing for weight loss has narrowed considerably as Zepbound provides the indicated alternative. For the comparison, see compounded tirzepatide vs Zepbound.
Programs that prescribe Mounjaro
These programs in our chart prescribe Mounjaro (with insurance coverage where applicable, or as a cash-pay option). Ranked by overall score.
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Mounjaro vs other GLP-1s
Learn more about Mounjaro
References
- SURPASS-2 registration trial. New England Journal of Medicine, 2021.
- Mounjaro FDA prescribing information (DailyMed).
Trial figures are mean results at the maximum dose in the cited registration trial. Real-world outcomes vary with adherence and clinical management.
Editorial disclosure
GLP Chart is an editorial comparison site. We do not dispense, prescribe or fulfill medications. Talk to a licensed clinician about whether Mounjaro is appropriate for you. Pricing reflects publicly verified rates as of June 22; verify with the manufacturer or your prescriber before committing.
