How much does tirzepatide cost per month?

It depends on the product and coverage. Manufacturer self-pay and savings-card prices change often; see the dated Zepbound and Mounjaro savings guides. For mg-based vials, enter your price to compute cost per month and per mg.

How many mg is the Phase 3 retatrutide ladder over 16 weeks?

The published 12 mg arm steps 2, 4, 6 and 9 mg, four weeks each, before 12 mg. Over those first 16 weeks that totals 4 × (2 + 4 + 6 + 9) = 84 mg. The calculator adds up any ladder the same way.

Why are whole vials and fractional vials different?

Whole vials are what you would need to have on hand for the period (rounded up). The fractional figure assumes the partial vial carries into the next period, which gives the true average cost per period.

Does the calculator include vendor prices?

No. Prices are your input only. GLP Ladder lists no sellers and prefills no prices, so the result is only as good as the number you type.

Is tirzepatide FDA approved?

Yes. FDA approved as Mounjaro (type 2 diabetes) and Zepbound (weight management, obstructive sleep apnea). Numbers on this page quote the FDA prescribing information; your prescriber sets your dose.

Tirzepatide Cost Calculator: Monthly & Per-mg

Short answer

Cost = vials × price, where vials = ceil(total mg ÷ vial mg). Example: 8 mg weekly for 4 weeks is 32 mg; 10 mg vials at $100 means 3.2 vials, so 4 vials and $400 ($320 if the partial vial carries over), or $10 per mg. You enter the price; as of Oct 19, 2026.

Cost, whole vials: $1,000.00
Vials needed: 10 (10 exact)
Total amount: 100 mg
Cost if partial vial carries over: $1,000.00
Average per 4 weeks: $250.00
Per mg: $10.00

Weekly amounts: FDA label ladder to 15 mg, 16 weeks, 10 mg vials at $100 (example)
Weeks	mg per week	mg in block
1–4	2.5	10
5–8	5	20
9–12	7.5	30
13–16	10	40

100 mg ÷ 10 mg per vial = 10 vials → 10 whole vials × $100 = $1,000.00.

Math, parameters and sources: model card.

How the cost math works

The calculator adds up every weekly amount in the period, divides by the vial size and rounds up to whole vials. It also reports the fractional number of vials, which is the fairer average when a partly used vial carries into the next period. Cost per mg is the price divided by the vial size. For brand pens priced per fill, the fill price is the monthly cost; see the dated savings guides for Zepbound and Mounjaro.

Frequently asked questions

How much does tirzepatide cost per month?: It depends on the product and coverage. Manufacturer self-pay and savings-card prices change often; see the dated Zepbound and Mounjaro savings guides. For mg-based vials, enter your price to compute cost per month and per mg.
How many mg is the Phase 3 retatrutide ladder over 16 weeks?: The published 12 mg arm steps 2, 4, 6 and 9 mg, four weeks each, before 12 mg. Over those first 16 weeks that totals 4 × (2 + 4 + 6 + 9) = 84 mg. The calculator adds up any ladder the same way.
Why are whole vials and fractional vials different?: Whole vials are what you would need to have on hand for the period (rounded up). The fractional figure assumes the partial vial carries into the next period, which gives the true average cost per period.
Does the calculator include vendor prices?: No. Prices are your input only. GLP Ladder lists no sellers and prefills no prices, so the result is only as good as the number you type.
Is tirzepatide FDA approved?: Yes. FDA approved as Mounjaro (type 2 diabetes) and Zepbound (weight management, obstructive sleep apnea). Numbers on this page quote the FDA prescribing information; your prescriber sets your dose.

Sources

ZEPBOUND (tirzepatide) injection, for subcutaneous use - Full Prescribing Information, Medication Guide and Instructions for Use (DailyMed SPL set ID 487cd7e7-434c-4925-99fa-aa80b1cc776b, version 40). U.S. National Library of Medicine (DailyMed) / Eli Lilly and Company, Aug 28, 2026. Accessed Oct 19, 2026.
MOUNJARO (tirzepatide) injection, for subcutaneous use - Full Prescribing Information, Medication Guide and Instructions for Use (DailyMed SPL set ID d2d7da5d-ad07-4228-955f-cf7e355c8cc0, version 40). U.S. National Library of Medicine (DailyMed) / Eli Lilly and Company, Aug 27, 2026. Accessed Oct 19, 2026.
Authentic Zepbound® (tirzepatide) Shipped to You | LillyDirect®. Eli Lilly and Company (LillyDirect), Oct 19, 2026. Accessed Oct 19, 2026.

Printed from GLP Ladder. To recreate this result, open https://glpladder.com/tools/tirzepatide-cost/

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