Both are tirzepatide. Only one is Zepbound. Zepbound is Lilly’s approved product[1]. Compounded tirzepatide is mixed by a pharmacy. FDA does not review it for safety, effectiveness or quality before it is sold[5].
The price gap
| Source | Lowest | Typical or top | Notes |
|---|---|---|---|
| Compounded injection | $83 | $249 | 361 sellers, each at its lowest monthly price |
| Zepbound, LillyDirect | $299 | $449 | Vial or KwikPen, refilled within 45 days |
353 of 361 compounded sellers list a month under $449. 236 list one under $299, Zepbound’s 2.5 mg price.
Each seller’s month is on the tirzepatide price board. The all-in monthly calculator adds the consult and membership fees.
Compare the same dose
Zepbound’s 2.5 mg month is $299[2]. From 7.5 mg up it is $449 on time[2]. Miss the 45-day window and it rises[2].
Compounded sellers price by vial, by dose or by plan. A low figure can be a starting dose. Ask what month four costs.
Divide by milligrams to compare vials. The cost-per-mg tool does it. The full Zepbound ladder is in Zepbound price.
What the extra money buys
Zepbound comes with trial evidence. SURMOUNT-1 randomized 2,539 adults with obesity or overweight[6]. None had diabetes[6]. At 72 weeks, weight fell 20.9% on 15 mg, against 3.1% on placebo[6].
No compounded product ran that trial. Its evidence is borrowed from the approved drug.
FDA had received more than 730 adverse-event reports tied to compounded tirzepatide by May 31, 2026[5]. It says such events are likely underreported[5]. State pharmacies need not report them[5].
Why the supply shrank
FDA declared the tirzepatide shortage resolved on December 19, 2024[3]. The drug had been on the shortage list since December 15, 2022[3].
A state pharmacy may not regularly make copies of an approved drug[4]. Same active ingredient, similar strength, same route: that counts as a copy[4]. The exception is a prescriber’s documented, significant difference for one patient[4].
FDA says it will not act on four or fewer such prescriptions a month[4]. Outsourcing facilities may not compound it from bulk ingredient[4]. It is on neither the shortage list nor the bulks list[4].
The full legal picture is in is compounded tirzepatide legal.
Four questions before paying
- What does the dose you will reach cost per month?
- Which pharmacy makes it, and is it state-licensed?
- Is it tirzepatide alone, or a blend with added ingredients?
- What is added: consult, membership, shipping, needles?
The Mounjaro side of the same molecule is in Mounjaro vs Zepbound.