15 mg vial + 2 mL bacteriostatic water
A 15 mg vial reconstituted with 2 mL comes to 7.5 mg/mL. Every unit on a U-100 insulin syringe then carries 75 mcg, so 500 mcg is 6.7 units (0.067 mL) and the vial holds 30 draws of that size.
Units for each amount
| Dose | mL | U-100 units | U-40 units | Doses per vial |
|---|---|---|---|---|
| 50 mcg | 0.0067 | 0.67 | 0.27 | 300 |
| 100 mcg | 0.013 | 1.3 | 0.53 | 150 |
| 150 mcg | 0.02 | 2 | 0.8 | 100 |
| 200 mcg | 0.027 | 2.7 | 1.1 | 75 |
| 250 mcg | 0.033 | 3.3 | 1.3 | 60 |
| 300 mcg | 0.04 | 4 | 1.6 | 50 |
| 400 mcg | 0.053 | 5.3 | 2.1 | 37 |
| 500 mcg | 0.067 | 6.7 | 2.7 | 30 |
| 750 mcg | 0.1 | 10 | 4 | 20 |
| 1 mg | 0.13 | 13.3 | 5.3 | 15 |
| 1.5 mg | 0.2 | 20 | 8 | 10 |
| 2 mg | 0.27 | 26.7 | 10.7 | 7 |
| 2.5 mg | 0.33 | 33.3 | 13.3 | 6 |
| 5 mg | 0.67 | 66.7 | 26.7 | 3 |
| 10 mg | 1.33 | 133.3 | 53.3 | 1 |
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 | 30 | 300 | 1.7 units | table → |
| 1 mL | 15 | 150 | 3.3 units | table → |
| 1.5 mL | 10 | 100 | 5 units | table → |
| 2 mL | 7.5 | 75 | 6.7 units | |
| 2.5 mL | 6 | 60 | 8.3 units | table → |
| 3 mL | 5 | 50 | 10 units | table → |
| 5 mL | 3 | 30 | 16.7 units | table → |
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15 mg + 2 mL questions
What concentration is 15 mg in 2 mL?
15 mg divided by 2 mL is 7.5 mg/mL, which is 7,500 mcg/mL. On a U-100 syringe each unit holds 0.01 mL, so one unit carries 75 mcg.
How many units is 500 mcg from a 15 mg vial with 2 mL?
500 mcg divided by 7,500 mcg/mL is 0.067 mL, which is 6.7 units on a U-100 syringe and 2.7 units on a U-40 syringe. The vial holds 30 draws of that size.
What if I add 2.5 mL instead of 2 mL to the 15 mg vial?
The mass stays 15 mg. With 2.5 mL the concentration is 6 mg/mL instead of 7.5 mg/mL, so the same amount per draw needs more units: 500 mcg becomes 8.3 units instead of 6.7.
Does a 15 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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