Tirzepatide 20mg Reconstitution: How Much Bacteriostatic Water & How Many Units
A 20mg vial of Tirzepatide contains 20,000 mcg. After you add bacteriostatic water, the amount of water decides the concentration — and therefore how many units you draw on a U-100 insulin syringe (1 ml = 100 units). The tables below cover the common water amounts.
Concentration by water amount
| Water added | Concentration | Per 1 unit (0.01 ml) | Per 10 units (0.1 ml) |
|---|---|---|---|
| 1 ml | 20 mg/ml | 200 mcg | 2 mg |
| 2 ml | 10 mg/ml | 100 mcg | 1 mg |
| 3 ml | 6.67 mg/ml | 66.67 mcg | 666.67 mcg |
How many units to draw
Example doses across the research range listed for Tirzepatide (2.5 mg–15 mg). Units are on a U-100 insulin syringe.
| Dose | With 1 ml | With 2 ml | With 3 ml | Doses per vial |
|---|---|---|---|---|
| 2.5 mg | 12.5 units | 25 units | 37.5 units | 8 |
| 6 mg | 30 units | 60 units | 90 units | 3 |
| 10 mg | 50 units | 100 units | 150 units (over 1 ml — split or use a larger syringe) | 2 |
| 15 mg | 75 units | 150 units (over 1 ml — split or use a larger syringe) | 225 units (over 1 ml — split or use a larger syringe) | 1 |
How to mix it
- Wipe the vial stoppers with alcohol and let them dry.
- Draw your chosen amount of bacteriostatic water into a sterile syringe.
- Inject the water slowly down the inside wall of the Tirzepatide vial — not directly onto the powder.
- Swirl gently until clear. Do not shake.
- Label the vial with the date and concentration, and store it in the refrigerator.
Full walkthrough: Peptide Reconstitution Guide · Injection Guide · Tirzepatide research profile
FAQ
How much bacteriostatic water do I add to a 20mg Tirzepatide vial?
Common choices are 1 ml, 2 ml, 3 ml. With 2 ml the concentration is 10 mg/ml. More water makes each dose a larger, easier-to-measure draw; less water keeps injection volume small. The amount of water does not change the dose — only how many units you draw.
How many units is 2.5 mg of Tirzepatide from a 20mg vial?
With 2 ml of bacteriostatic water, 2.5 mg is 25 units on a U-100 (1 ml) insulin syringe. See the table above for other water amounts.
How many doses are in a 20mg Tirzepatide vial?
At 2.5 mg per dose, a 20mg vial holds about 8 doses. At higher doses it holds fewer — see the table.