Semaglutide 2 mg reconstituted with 0.5 mL
Concentration
4mg/mL
- Per insulin unit
- 40 mcg
- Solution in vial
- 50 u
- 1.7 mg draw
- 42.5 u
Math utility only — not medical advice. Not a recommended dose.
Units per dose at 4 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 |
|---|---|---|---|---|
| 250 mcg | 0.063 mL | 6.3 u | U-30 | 8 |
| 500 mcg | 0.125 mL | 12.5 u | U-30 | 4 |
| 1 mg | 0.25 mL | 25 u | U-30 | 2 |
| 1.7 mg | 0.425 mL | 42.5 u | U-50 | 1 |
How this is calculated
1 · Concentration
2 mg ÷ 0.5 mL = 4 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 1.7 mg dose
1.7 mg ÷ 4 mg/mL = 0.425 mL
3 · Insulin units
0.425 mL × 100 = 42.5 units
Every unit on the barrel carries 40 mcg at this concentration, so misreading by one unit is a 40 mcg error.
See it on a real syringe
The interactive calculator draws this 4 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 2 mg Semaglutide vial?
- Adding 0.5 mL of bacteriostatic water to a 2 mg Semaglutide vial yields 4 mg/mL — 40 mcg in every insulin unit. The reconstituted vial holds 50 units of solution in total.
- How many units is a 1.7 mg dose of Semaglutide at 2 mg in 0.5 mL?
- 1.7 mg is 0.425 mL of this mix, which is 42.5 units on a U-100 insulin syringe (a U-50 barrel is enough).
- How many 1.7 mg doses does a 2 mg vial give?
- A 2 mg vial contains 1 full 1.7 mg doses. Using more or less bacteriostatic water changes the units you draw, never the number of doses in the vial.