Tirzepatide 30 mg Vial Dosage Chart: Units, Doses, and Reconstitution

A 30 mg tirzepatide vial contains 30 mg of lyophilized peptide, and the dose you draw depends entirely on how much bacteriostatic water you add. Reconstituted with 3 mL of diluent, the vial becomes 10 mg/mL, so a 2.5 mg dose equals 25 units on a U-100 insulin syringe. Reconstituted with 1.2 mL, it becomes 25 mg/mL, and that same 2.5 mg dose is only 10 units.

Tirzepatide is an FDA-approved prescription medicine sold in the United States as Mounjaro and Zepbound, but single 30 mg vials sold online are usually marketed as research chemicals and are not FDA-approved for human injection. The math below is reference information only; real dosing decisions belong with a licensed healthcare professional.

Concentration and Draw Volume: The Two Numbers That Matter

Every calculation for a 30 mg tirzepatide vial comes down to two figures.

• Concentration: total milligrams divided by milliliters of diluent. A 30 mg vial mixed with 3 mL of water is 10 mg/mL.
• Draw volume: your target dose divided by the concentration. A 2.5 mg dose at 10 mg/mL is 0.25 mL.
• Syringe units: a U-100 insulin syringe measures 100 units per 1 mL, so 0.25 mL reads as 25 units.

Because both numbers move together, the same vial can produce very different draw volumes for the same milligram dose. Adding more water makes each unit weaker; adding less makes each unit stronger.

Tirzepatide 30 mg Vial Dosage Chart

The table below converts common weekly doses into milliliters and U-100 syringe units at three popular reconstitution volumes.

Dose	3 mL diluent (10 mg/mL)	1.5 mL diluent (20 mg/mL)	1.2 mL diluent (25 mg/mL)
2.5 mg	0.25 mL = 25 units	0.125 mL = 12.5 units	0.1 mL = 10 units
5 mg	0.5 mL = 50 units	0.25 mL = 25 units	0.2 mL = 20 units
7.5 mg	0.75 mL = 75 units	0.375 mL = 37.5 units	0.3 mL = 30 units
10 mg	1 mL = 100 units	0.5 mL = 50 units	0.4 mL = 40 units
12.5 mg	1.25 mL = 125 units	0.625 mL = 62.5 units	0.5 mL = 50 units
15 mg	1.5 mL = 150 units	0.75 mL = 75 units	0.6 mL = 60 units

Doses above 100 units require either a second injection or a larger syringe, which is why most people working with a 30 mg vial choose the 3 mL dilution. Half-unit marks on a U-100 syringe are difficult to read accurately, so the 20 mg/mL option can introduce measuring error.

How Many Doses Come From One 30 mg Vial

Vial lifespan shrinks quickly as the weekly dose rises.

Weekly dose	Doses per 30 mg vial
2.5 mg	12 doses
5 mg	6 doses
7.5 mg	4 doses
10 mg	3 doses
12.5 mg	2 doses
15 mg	2 doses

Those totals assume perfect transfer with no loss. Dead space in the needle hub and leftover solution in the vial reduce the count slightly, so a 30 mg vial rarely yields a full extra dose.

Standard Tirzepatide Titration Schedule

The FDA-approved label for Mounjaro and Zepbound escalates the dose slowly to limit gastrointestinal side effects. A standard tirzepatide dosage chart follows a four-week step pattern.

Weeks	Weekly dose
1-4	2.5 mg
5-8	5 mg
9-12	7.5 mg
13-16	10 mg
17-20	12.5 mg
21 and beyond	15 mg (maximum labeled dose)

Not everyone follows that ladder. Some clinicians hold at a lower dose when response is adequate, and others step back down if side effects appear. Tirzepatide is not approved for doses above 15 mg once weekly.

A 30 mg vial covers only two weeks at the 15 mg maximum dose, while the same vial lasts twelve weeks at the 2.5 mg starting dose.

Reconstituting a 30 mg Vial Step by Step

1. Clean the rubber stopper with an alcohol swab and let it dry completely.
2. Draw the chosen volume of bacteriostatic water (3 mL is the most common choice) into a syringe.
3. Inject the water slowly against the inside wall of the vial rather than directly onto the powder.
4. Swirl gently until the powder dissolves; do not shake, which can damage the peptide.
5. Label the vial with the date and the concentration, then refrigerate at 2-8 °C (36-46 °F), protected from light.
6. Inspect the solution before each draw. A cloudy or particle-filled vial should be discarded.

Bacteriostatic water contains benzyl alcohol, which slows bacterial growth, and most compounded and research vials are considered usable for roughly 28 to 30 days after the first puncture. Sterile water without a preservative has a much shorter window.

Common Measuring and Dosing Mistakes

• Confusing milligrams with units. A 10 mg dose and 10 units are completely different amounts, and mixing them up is the most frequent error.
• Assuming every vial is 10 mg/mL. Concentration changes with the diluent volume, not the vial size.
• Using the wrong syringe scale. U-40 and U-100 syringes are marked differently, so the syringe must match the calculation.
• Escalating too quickly. Nausea, vomiting, and constipation are the most common tirzepatide side effects and are driven largely by dose speed.
• Skipping refrigeration. Heat and light degrade peptides and make the labeled concentration unreliable.

Anyone experiencing severe abdominal pain, persistent vomiting, or signs of dehydration should seek medical care rather than adjusting a dose alone.

How Other Peptide Vials Compare

The same mg-per-mL arithmetic applies to nearly every lyophilized peptide. A reta 15 mg dosage chart uses identical math with a smaller total, and a bpc-157 dosage chart by weight scales the calculation to body weight rather than a fixed weekly dose.

A mots-c dosage chart works the same way, with a typical 10 mg vial reconstituted to 10 mg/mL for easier unit readings. What changes between compounds is the target dose and frequency, not the reconstitution formula.

Sourcing and Third-Party Testing

Vendor quality varies far more than product pages suggest. Community write-ups such as pura peptides reviews can flag slow shipping or mislabeled vials, but they are not proof of purity.

A meaningful quality check means a third-party lab report with a batch number, a purity percentage, and an HPLC or mass-spec result that matches the vial in hand. If a seller cannot provide that documentation on request, the listed concentration is only a claim.

COMMON QUESTIONS

Frequently Asked Questions

How many doses are in a 30 mg tirzepatide vial?

A 30 mg vial holds 12 doses of 2.5 mg, 6 doses of 5 mg, 4 doses of 7.5 mg, 3 doses of 10 mg, 2 doses of 12.5 mg, or 2 doses of 15 mg. Real-world yields run slightly lower because some solution stays behind in the vial and needle hub.

How much bacteriostatic water should I add to a 30 mg tirzepatide vial?

The most common choice is 3 mL, which creates a 10 mg/mL solution and keeps every common dose under 100 units on a U-100 syringe. Adding 1.2 mL instead creates 25 mg/mL, which produces smaller draw volumes but leaves less room for reading error.

Is a 30 mg tirzepatide vial the same as Mounjaro or Zepbound?

No. Mounjaro and Zepbound are FDA-approved tirzepatide products supplied in prefilled pens with fixed doses. Single 30 mg vials are typically sold as research chemicals, are not FDA-approved for human use, and should not be treated as equivalent to a prescription product.