Tirzepatide 15 mg reconstituted with 1.5 mL
Concentration
10mg/mL
- Per insulin unit
- 100 mcg
- Solution in vial
- 150 u
- 10 mg draw
- 100 u
Math utility only — not medical advice. Not a recommended dose.
Units per dose at 10 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 | 0.25 mL | 25 u | U-30 | 6 |
| 5 mg | 0.5 mL | 50 u | U-50 | 3 |
| 7.5 mg | 0.75 mL | 75 u | U-100 | 2 |
| 10 mg | 1 mL | 100 u | U-100 | 1 |
| 12.5 mg | 1.25 mL | 125 u | split draw | 1 |
| 15 mg | 1.5 mL | 150 u | split draw | 1 |
Amber rows exceed 100 units — more than one full U-100 barrel. That dose needs a larger draw or a stronger mix (less water).
How this is calculated
1 · Concentration
15 mg ÷ 1.5 mL = 10 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 10 mg dose
10 mg ÷ 10 mg/mL = 1 mL
3 · Insulin units
1 mL × 100 = 100 units
Every unit on the barrel carries 100 mcg at this concentration, so misreading by one unit is a 100 mcg error.
See it on a real syringe
The interactive calculator draws this 10 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 15 mg Tirzepatide vial?
- Adding 1.5 mL of bacteriostatic water to a 15 mg Tirzepatide vial yields 10 mg/mL — 100 mcg in every insulin unit. The reconstituted vial holds 150 units of solution in total.
- How many units is a 10 mg dose of Tirzepatide at 15 mg in 1.5 mL?
- 10 mg is 1 mL of this mix, which is 100 units on a U-100 insulin syringe (a U-100 barrel is enough).
- How many 10 mg doses does a 15 mg vial give?
- A 15 mg vial contains 1 full 10 mg doses. Using more or less bacteriostatic water changes the units you draw, never the number of doses in the vial.