PeptideCalculations
33.333 mg/mL · 33,333 mcg/mL · 333.33 mcg per U-100 unit

50 mg vial + 1.5 mL bacteriostatic water

A 50 mg vial reconstituted with 1.5 mL comes to 33.333 mg/mL. Every unit on a U-100 insulin syringe then carries 333.33 mcg, so 5 mg is 15 units (0.15 mL) and the vial holds 10 draws of that size.

Units for each amount

50 mg vial + 1.5 mL = 33.333 mg/mL (33,333 mcg/mL, 333.33 mcg per unit on U-100)
DosemLU-100 unitsU-40 unitsDoses per vial
50 mcg0.00150.150.061000
100 mcg0.0030.30.12500
150 mcg0.00450.450.18333
200 mcg0.0060.60.24250
250 mcg0.00750.750.3200
300 mcg0.0090.90.36166
400 mcg0.0121.20.48125
500 mcg0.0151.50.6100
750 mcg0.0232.30.966
1 mg0.0331.250
1.5 mg0.0454.51.833
2 mg0.0662.425
2.5 mg0.0757.5320
5 mg0.1515610
10 mg0.330125

Same vial, other volumes

The mass does not move. Only the concentration and the unit count do.

Watermg/mLmcg per unit5 mg =
1 mL5050010 unitstable →
1.5 mL33.333333.3315 units
2 mL2525020 unitstable →
2.5 mL2020025 unitstable →
3 mL16.667166.6730 unitstable →
5 mL1010050 unitstable →

Try other numbers

mL
Draw to
—units
— mL on a U-100, 1 mL barrel
Concentration
—mg/mL
— mcg per unit
Doses in the vial
—
of

50 mg + 1.5 mL questions

What concentration is 50 mg in 1.5 mL?

50 mg divided by 1.5 mL is 33.333 mg/mL, which is 33,333 mcg/mL. On a U-100 syringe each unit holds 0.01 mL, so one unit carries 333.33 mcg.

How many units is 5 mg from a 50 mg vial with 1.5 mL?

5000 mcg divided by 33,333 mcg/mL is 0.15 mL, which is 15 units on a U-100 syringe and 6 units on a U-40 syringe. The vial holds 10 draws of that size.

What if I add 2 mL instead of 1.5 mL to the 50 mg vial?

The mass stays 50 mg. With 2 mL the concentration is 25 mg/mL instead of 33.333 mg/mL, so the same amount per draw needs more units: 5 mg becomes 20 units instead of 15.

Does a 50 mg vial hold 1.5 mL?

Usually. Most lyophilized peptide vials are 2 mL or 3 mL glass, and 1.5 mL fits with room to swirl. Check the vial if it is an unusually small format.

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