Tirzepatide 30 mg reconstituted with 4 mL
Concentration
7.5mg/mL
- Per insulin unit
- 75 mcg
- Solution in vial
- 400 u
- 7.5 mg draw
- 100 u
Math utility only — not medical advice. Not a recommended dose.
Units per dose at 7.5 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 | 0.333 mL | 33.3 u | U-50 | 12 |
| 5 mg | 0.667 mL | 66.7 u | U-100 | 6 |
| 7.5 mg | 1 mL | 100 u | U-100 | 4 |
| 10 mg | 1.333 mL | 133.3 u | split draw | 3 |
| 12.5 mg | 1.667 mL | 166.7 u | split draw | 2 |
| 15 mg | 2 mL | 200 u | split draw | 2 |
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
30 mg ÷ 4 mL = 7.5 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 7.5 mg dose
7.5 mg ÷ 7.5 mg/mL = 1 mL
3 · Insulin units
1 mL × 100 = 100 units
Every unit on the barrel carries 75 mcg at this concentration, so misreading by one unit is a 75 mcg error.
See it on a real syringe
The interactive calculator draws this 7.5 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 30 mg Tirzepatide vial?
- Adding 4 mL of bacteriostatic water to a 30 mg Tirzepatide vial yields 7.5 mg/mL — 75 mcg in every insulin unit. The reconstituted vial holds 400 units of solution in total.
- How many units is a 7.5 mg dose of Tirzepatide at 30 mg in 4 mL?
- 7.5 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 7.5 mg doses does a 30 mg vial give?
- A 30 mg vial contains 4 full 7.5 mg doses. Using more or less bacteriostatic water changes the units you draw, never the number of doses in the vial.