Tirzepatide 5 mg reconstituted with 0.5 mL
Concentration
10mg/mL
- Per insulin unit
- 100 mcg
- Solution in vial
- 50 u
- 5 mg draw
- 50 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 | 2 |
| 5 mg | 0.5 mL | 50 u | U-50 | 1 |
How this is calculated
1 · Concentration
5 mg ÷ 0.5 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 5 mg dose
5 mg ÷ 10 mg/mL = 0.5 mL
3 · Insulin units
0.5 mL × 100 = 50 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 5 mg Tirzepatide vial?
- Adding 0.5 mL of bacteriostatic water to a 5 mg Tirzepatide vial yields 10 mg/mL — 100 mcg in every insulin unit. The reconstituted vial holds 50 units of solution in total.
- How many units is a 5 mg dose of Tirzepatide at 5 mg in 0.5 mL?
- 5 mg is 0.5 mL of this mix, which is 50 units on a U-100 insulin syringe (a U-50 barrel is enough).
- How many 5 mg doses does a 5 mg vial give?
- A 5 mg vial contains 1 full 5 mg doses. Using more or less bacteriostatic water changes the units you draw, never the number of doses in the vial.