20 mg vial + 2 mL bacteriostatic water
A 20 mg vial reconstituted with 2 mL comes to 10 mg/mL. Every unit on a U-100 insulin syringe then carries 100 mcg, so 500 mcg is 5 units (0.05 mL) and the vial holds 40 draws of that size.
Units for each amount
| Dose | mL | U-100 units | U-40 units | Doses per vial |
|---|---|---|---|---|
| 50 mcg | 0.005 | 0.5 | 0.2 | 400 |
| 100 mcg | 0.01 | 1 | 0.4 | 200 |
| 150 mcg | 0.015 | 1.5 | 0.6 | 133 |
| 200 mcg | 0.02 | 2 | 0.8 | 100 |
| 250 mcg | 0.025 | 2.5 | 1 | 80 |
| 300 mcg | 0.03 | 3 | 1.2 | 66 |
| 400 mcg | 0.04 | 4 | 1.6 | 50 |
| 500 mcg | 0.05 | 5 | 2 | 40 |
| 750 mcg | 0.075 | 7.5 | 3 | 26 |
| 1 mg | 0.1 | 10 | 4 | 20 |
| 1.5 mg | 0.15 | 15 | 6 | 13 |
| 2 mg | 0.2 | 20 | 8 | 10 |
| 2.5 mg | 0.25 | 25 | 10 | 8 |
| 5 mg | 0.5 | 50 | 20 | 4 |
| 10 mg | 1 | 100 | 40 | 2 |
Same vial, other volumes
The mass does not move. Only the concentration and the unit count do.
| Water | mg/mL | mcg per unit | 500 mcg = | |
|---|---|---|---|---|
| 0.5 mL | 40 | 400 | 1.3 units | table → |
| 1 mL | 20 | 200 | 2.5 units | table → |
| 1.5 mL | 13.333 | 133.33 | 3.8 units | table → |
| 2 mL | 10 | 100 | 5 units | |
| 2.5 mL | 8 | 80 | 6.3 units | table → |
| 3 mL | 6.667 | 66.67 | 7.5 units | table → |
| 5 mL | 4 | 40 | 12.5 units | table → |
Same concentration, different vial
These pairs also come to 10 mg/mL, so their unit counts match this page exactly; only the number of draws per vial differs: 5 mg + 0.5 mL, 10 mg + 1 mL, 15 mg + 1.5 mL, 30 mg + 3 mL, 50 mg + 5 mL.
Try other numbers
20 mg + 2 mL questions
What concentration is 20 mg in 2 mL?
20 mg divided by 2 mL is 10 mg/mL, which is 10,000 mcg/mL. On a U-100 syringe each unit holds 0.01 mL, so one unit carries 100 mcg.
How many units is 500 mcg from a 20 mg vial with 2 mL?
500 mcg divided by 10,000 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 40 draws of that size.
What if I add 2.5 mL instead of 2 mL to the 20 mg vial?
The mass stays 20 mg. With 2.5 mL the concentration is 8 mg/mL instead of 10 mg/mL, so the same amount per draw needs more units: 500 mcg becomes 6.3 units instead of 5.
Does a 20 mg vial hold 2 mL?
Usually. Most lyophilized peptide vials are 2 mL or 3 mL glass, and 2 mL fits with room to swirl. Check the vial if it is an unusually small format.
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