1 mg vial + 0.5 mL bacteriostatic water
A 1 mg vial reconstituted with 0.5 mL comes to 2 mg/mL. Every unit on a U-100 insulin syringe then carries 20 mcg, so 100 mcg is 5 units (0.05 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 | 0.025 | 2.5 | 1 | 20 |
| 100 mcg | 0.05 | 5 | 2 | 10 |
| 150 mcg | 0.075 | 7.5 | 3 | 6 |
| 200 mcg | 0.1 | 10 | 4 | 5 |
| 250 mcg | 0.13 | 12.5 | 5 | 4 |
| 300 mcg | 0.15 | 15 | 6 | 3 |
| 400 mcg | 0.2 | 20 | 8 | 2 |
| 500 mcg | 0.25 | 25 | 10 | 2 |
| 750 mcg | 0.38 | 37.5 | 15 | 1 |
| 1 mg | 0.5 | 50 | 20 | 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 | |
| 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 | table → |
| 3 mL | 0.333 | 3.33 | 30 units | table → |
Same concentration, different vial
These pairs also come to 2 mg/mL, so their unit counts match this page exactly; only the number of draws per vial differs: 2 mg + 1 mL, 3 mg + 1.5 mL, 5 mg + 2.5 mL, 10 mg + 5 mL.
Try other numbers
1 mg + 0.5 mL questions
What concentration is 1 mg in 0.5 mL?
1 mg divided by 0.5 mL is 2 mg/mL, which is 2,000 mcg/mL. On a U-100 syringe each unit holds 0.01 mL, so one unit carries 20 mcg.
How many units is 100 mcg from a 1 mg vial with 0.5 mL?
100 mcg divided by 2,000 mcg/mL is 0.05 mL, which is 5 units on a U-100 syringe and 2 units on a U-40 syringe. The vial holds 10 draws of that size.
What if I add 1 mL instead of 0.5 mL to the 1 mg vial?
The mass stays 1 mg. With 1 mL the concentration is 1 mg/mL instead of 2 mg/mL, so the same amount per draw needs more units: 100 mcg becomes 10 units instead of 5.
Does a 1 mg vial hold 0.5 mL?
Usually. Most lyophilized peptide vials are 2 mL or 3 mL glass, and 0.5 mL fits with room to swirl. Check the vial if it is an unusually small format.
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