12.5mg of Tirzepatide from a 15mg vial in 1mL: how many units?
Answer
Draw 83.3 units on a U-100 insulin syringe. A 15 mg Tirzepatide vial reconstituted with 1 mL of bacteriostatic water is 15 mg/mL, so 12.5 mg is 0.833 mL. That vial holds about 1 dose at this strength.
This page also answers
- How many units is 12.5mg of tirz?
- 12.5mg tirz on a U-100 syringe
- What do I draw for 12.5mg if I used 1ml?
- 12.5 mg tirz in units
Your draw
| Vial | 15 mg |
| Bacteriostatic water | 1 mL |
| Concentration | 15 mg/mL |
| Dose | 12.5 mg |
| Volume to draw | 0.833 mL |
| U-100 syringe | 83.3 units |
| U-40 syringe | 33.3 units |
| Doses per vial | 1 |
Dose chart: 15 mg vial in 1 mL
| Dose | Volume | U-100 units | U-40 units | Doses per vial |
|---|---|---|---|---|
| 0.5 mg | 0.033 mL | 3.3 | 1.3 | 30 |
| 1 mg | 0.067 mL | 6.7 | 2.7 | 15 |
| 1.25 mg | 0.083 mL | 8.3 | 3.3 | 12 |
| 2 mg | 0.133 mL | 13.3 | 5.3 | 7 |
| 2.5 mg | 0.167 mL | 16.7 | 6.7 | 6 |
| 5 mg | 0.333 mL | 33.3 | 13.3 | 3 |
| 7.5 mg | 0.5 mL | 50 | 20 | 2 |
| 10 mg | 0.667 mL | 66.7 | 26.7 | 1 |
| 12.5 mg | 0.833 mL | 83.3 | 33.3 | 1 |
| 15 mg | 1 mL | 100 | 40 | 1 |
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 mL.
- Is that on a U-100 or U-40 syringe?
- 83.3 units is the U-100 reading, the standard insulin syringe at 100 units to 1 mL. On a U-40 syringe the same 0.833 mL reads 33.3 units.
- How many 12.5 mg doses will this vial give?
- About 1 dose from a 15 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.