1 mg vial + 2.5 mL bacteriostatic water
A 1 mg vial reconstituted with 2.5 mL comes to 0.4 mg/mL. Every unit on a U-100 insulin syringe then carries 4 mcg, so 100 mcg is 25 units (0.25 mL) and the vial holds 10 draws of that size.
Units for each amount
| Dose | mL | U-100 units | U-40 units | Doses per vial |
|---|---|---|---|---|
| 50 mcg | 0.13 | 12.5 | 5 | 20 |
| 100 mcg | 0.25 | 25 | 10 | 10 |
| 150 mcg | 0.37 | 37.5 | 15 | 6 |
| 200 mcg | 0.5 | 50 | 20 | 5 |
| 250 mcg | 0.63 | 62.5 | 25 | 4 |
| 300 mcg | 0.75 | 75 | 30 | 3 |
| 400 mcg | 1 | 100 | 40 | 2 |
| 500 mcg | 1.25 | 125 | 50 | 2 |
| 750 mcg | 1.88 | 187.5 | 75 | 1 |
| 1 mg | 2.5 | 250 | 100 | 1 |
Same vial, other volumes
The mass does not move. Only the concentration and the unit count do.
| Water | mg/mL | mcg per unit | 100 mcg = | |
|---|---|---|---|---|
| 0.5 mL | 2 | 20 | 5 units | table → |
| 1 mL | 1 | 10 | 10 units | table → |
| 1.5 mL | 0.667 | 6.67 | 15 units | table → |
| 2 mL | 0.5 | 5 | 20 units | table → |
| 2.5 mL | 0.4 | 4 | 25 units | |
| 3 mL | 0.333 | 3.33 | 30 units | table → |
Try other numbers
1 mg + 2.5 mL questions
What concentration is 1 mg in 2.5 mL?
1 mg divided by 2.5 mL is 0.4 mg/mL, which is 400 mcg/mL. On a U-100 syringe each unit holds 0.01 mL, so one unit carries 4 mcg.
How many units is 100 mcg from a 1 mg vial with 2.5 mL?
100 mcg divided by 400 mcg/mL is 0.25 mL, which is 25 units on a U-100 syringe and 10 units on a U-40 syringe. The vial holds 10 draws of that size.
What if I add 3 mL instead of 2.5 mL to the 1 mg vial?
The mass stays 1 mg. With 3 mL the concentration is 0.333 mg/mL instead of 0.4 mg/mL, so the same amount per draw needs more units: 100 mcg becomes 30 units instead of 25.
Does a 1 mg vial hold 2.5 mL?
Usually. Most lyophilized peptide vials are 2 mL or 3 mL glass, and 2.5 mL fits with room to swirl. Check the vial if it is an unusually small format.
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