Reconstitution calculator
From vial to syringe
Enter the vial strength, how much bacteriostatic water you add, and the dose you want to draw.
Draw to
10units
= 0.1 mL on a U-100 insulin syringe
020406080100
Concentration
2.5 mg/mL
Doses in vial
20
In plain English
- 1Take the 5 mg vial out of the fridge. Wipe the rubber top with an alcohol swab.
- 2Draw 2 mL of bacteriostatic water and add it slowly, letting it run down the inside of the glass. Swirl gently until clear. Never shake.
- 3The vial now holds 2.5 mg per mL. Write that and today's date on the label.
- 4Take a U-100 insulin syringe and pull 10 units (0.1 mL) from the vial. That is your 250 mcg dose.
- 5Swab a spot on the belly two fingers from the navel, pinch the skin, insert at 45–90° and press the plunger slowly. Use a fresh spot each time.
- 6Back in the fridge. This vial holds about 20 doses and should be used within roughly 4 weeks.
Arithmetic only: units = dose ÷ (vial ÷ water) × 100. Always confirm against your own vial label.