Tirzepatide 40 mg reconstituted with 1.5 mL
Concentration
26.67mg/mL
- Per insulin unit
- 266.7 mcg
- Solution in vial
- 150 u
- 15 mg draw
- 56.3 u
Math utility only — not medical advice. Not a recommended dose.
Units per dose at 26.67 mg/mL
Insulin syringes are graduated in hundredths of a millilitre, so units = mL × 100 on a U-100, U-50 or U-30 barrel alike.
| Dose | Volume | U-100 units | Fits | Doses per vial |
|---|---|---|---|---|
| 2.5 mg | 0.094 mL | 9.4 u | U-30 | 16 |
| 5 mg | 0.188 mL | 18.8 u | U-30 | 8 |
| 7.5 mg | 0.281 mL | 28.1 u | U-30 | 5 |
| 10 mg | 0.375 mL | 37.5 u | U-50 | 4 |
| 12.5 mg | 0.469 mL | 46.9 u | U-50 | 3 |
| 15 mg | 0.563 mL | 56.3 u | U-100 | 2 |
How this is calculated
1 · Concentration
40 mg ÷ 1.5 mL = 26.67 mg/mL
The peptide mass never changes — bacteriostatic water only sets how concentrated the solution is, and therefore how far the plunger travels.
2 · Volume for a 15 mg dose
15 mg ÷ 26.67 mg/mL = 0.563 mL
3 · Insulin units
0.563 mL × 100 = 56.3 units
Every unit on the barrel carries 266.7 mcg at this concentration, so misreading by one unit is a 266.7 mcg error.
See it on a real syringe
The interactive calculator draws this 26.67 mg/mL mix on a scaled U-100 barrel, shows when a draw lands exactly on a printed tick, and works backwards from a target dose to the water volume that makes it land cleanly.
Open the interactive calculator →Common questions
- How much bacteriostatic water for a 40 mg Tirzepatide vial?
- Adding 1.5 mL of bacteriostatic water to a 40 mg Tirzepatide vial yields 26.67 mg/mL — 266.7 mcg in every insulin unit. The reconstituted vial holds 150 units of solution in total.
- How many units is a 15 mg dose of Tirzepatide at 40 mg in 1.5 mL?
- 15 mg is 0.563 mL of this mix, which is 56.3 units on a U-100 insulin syringe (a U-100 barrel is enough).
- How many 15 mg doses does a 40 mg vial give?
- A 40 mg vial contains 2 full 15 mg doses. Using more or less bacteriostatic water changes the units you draw, never the number of doses in the vial.