0.5mg of Semaglutide from a 20mg vial in 1.5mL: how many units?
Answer
Draw 3.8 units on a U-100 insulin syringe. A 20 mg Semaglutide vial reconstituted with 1.5 mL of bacteriostatic water is 13.33 mg/mL, so 0.5 mg is 0.038 mL. That vial holds about 40 doses at this strength.
This page also answers
- How many units is 0.5mg of sema?
- 0.5mg sema on a U-100 syringe
- What do I draw for 0.5mg if I used 1.5ml?
- 0.5 mg sema in units
Your draw
| Vial | 20 mg |
| Bacteriostatic water | 1.5 mL |
| Concentration | 13.33 mg/mL |
| Dose | 0.5 mg |
| Volume to draw | 0.038 mL |
| U-100 syringe | 3.8 units |
| U-40 syringe | 1.5 units |
| Doses per vial | 40 |
Dose chart: 20 mg vial in 1.5 mL
| Dose | Volume | U-100 units | U-40 units | Doses per vial |
|---|---|---|---|---|
| 0.125 mg | 0.009 mL | 0.9 | 0.4 | 160 |
| 0.25 mg | 0.019 mL | 1.9 | 0.8 | 80 |
| 0.5 mg | 0.038 mL | 3.8 | 1.5 | 40 |
| 1 mg | 0.075 mL | 7.5 | 3 | 20 |
| 1.7 mg | 0.128 mL | 12.8 | 5.1 | 11 |
| 2 mg | 0.15 mL | 15 | 6 | 10 |
| 2.4 mg | 0.18 mL | 18 | 7.2 | 8 |
| 3 mg | 0.225 mL | 22.5 | 9 | 6 |
Doses that would need more than a full 1 mL syringe are omitted. Use less bacteriostatic water for those.
Common questions
- What if I used a different amount of water?
- Then the unit number changes. Units depend on concentration, not just dose. Run your actual vial size and water volume through the reconstitution calculator rather than copying a number from a chart that assumes 1.5 mL.
- Is that on a U-100 or U-40 syringe?
- 3.8 units is the U-100 reading, the standard insulin syringe at 100 units to 1 mL. On a U-40 syringe the same 0.038 mL reads 1.5 units.
- How many 0.5 mg doses will this vial give?
- About 40 doses from a 20 mg vial. Reconstitution volume doesn't change that. It only changes how many units you draw each time.
- How long is it good for after mixing?
- Refrigerate reconstituted peptide at 36–46°F (2–8°C). Most references give 28–60 days once mixed, depending on the preservative in the bacteriostatic water. Do not freeze it, and inspect for cloudiness or particles before every draw.
Run your own numbers
These figures assume the vial and water volumes named above. Change either one and the units change with it.