Tirzepatide is reconstituted exactly like semaglutide — add bacteriostatic water to a freeze-dried powder.
Vials are often larger (10, 15, 30 mg) and reference doses are larger, so draws land in a bigger, easier-to-read range.
Concentration = vial mg ÷ water mL; the water volume sets units-per-draw, never the total compound.
Correctly mixed tirzepatide is clear and colourless to very faintly tinted, with no visible particles.
Add water down the wall, swirl gently, label with concentration and date, and refrigerate.
Tirzepatide is reconstituted exactly like semaglutide, but vials are often larger (10 mg, 15 mg, 30 mg) and the reference doses are correspondingly larger, so draws land in a different range. In plain terms: same method, bigger numbers — which actually makes tirzepatide draws easier to read.
Why the numbers are bigger
Tirzepatide is a dual GIP/GLP-1 receptor agonist with a plasma half-life of about five days, supporting once-weekly dosing1. Its reference doses are measured in whole milligrams rather than tenths, so even a fairly concentrated mix produces a comfortable number of units.
Concentration for a larger vial
For a 10 mg vial and a 2.5 mg reference dose:
Water added
Concentration
2.5 mg draw (U-100)
1 mL
10 mg/mL
25 units
2 mL
5 mg/mL
50 units
3 mL
3.33 mg/mL
75 units
Every row is the same total compound and the same dose; only the units-per-draw change. Because tirzepatide doses are larger than semaglutide's, all three land in a readable range.
Method
Bring the vial and bacteriostatic water to room temperature; swab both stoppers.
Add your chosen water volume down the inside wall of the vial — bacteriostatic water's preservative is what lets you enter the vial repeatedly afterwards2.
Swirl gently; do not shake. Allow a few minutes to fully dissolve.
Label with concentration and date, and refrigerate.
Enter your vial size and water volume in the tirzepatide calculator for the exact draw in units.
Try it with the calculator
CONCENTRATION
7.5 mg/mL
YOUR DRAW (U-100)
100 units
DOSES IN VIAL
2
0102030405060708090100
Frequently asked
How much water for a 10 mg tirzepatide vial?
Any volume works — it sets the concentration. Adding 2 mL to a 10 mg vial gives 5 mg/mL; a 2.5 mg dose is then 0.5 mL = 50 units on a U-100 syringe. Use the calculator to match a water volume to a comfortable draw size.
Why do tirzepatide draws land at more units than semaglutide?
Because the reference doses are larger. Tirzepatide is dosed in whole milligrams while semaglutide is dosed in tenths of a milligram, so at the same concentration a tirzepatide draw occupies more units on the barrel.
References
Schneck KB, Zhang Q, Bauer R, et al. Population pharmacokinetics of the GIP/GLP-1 receptor agonist tirzepatide.CPT Pharmacometrics Syst Pharmacol. 2024. DOI 10.1002/psp4.13099
Pfizer Injectables / U.S. Pharmacopeia Bacteriostatic Water for Injection, USP — prescribing information (0.9% benzyl alcohol added as a bacteriostatic preservative; multiple-dose container).DailyMed (U.S. National Library of Medicine). 2023. Bacteriostatic Water for Injection USP
Zyra Labs is a research and educational utility. Nothing on this page is medical advice, a dosing recommendation, or an endorsement of any compound. We never sell or source compounds and refuse sourcing questions. Consult a qualified clinician for decisions about your health.