2 mg peptide vial: reconstitution calculator and unit chart
A 2 mg vial holds 2,000 mcg. Reconstituted with 2 mL of liquid it is 1 mg/mL, so each unit on a U-100 syringe holds 10 mcg and a 250 mcg dose is 25 units. Change the numbers below for your own vial.
Unit chart for a 2 mg vial
Units to draw on a U-100 insulin syringe, by how much liquid was added to the vial.
| Liquid added | Concentration | mcg per unit | 100 mcg | 250 mcg | 500 mcg |
|---|---|---|---|---|---|
| 1 mL | 2 mg/mL | 20 mcg | 5 units | 12.5 units | 25 units |
| 2 mL | 1 mg/mL | 10 mcg | 10 units | 25 units | 50 units |
| 3 mL | 0.67 mg/mL | 6.67 mcg | 15 units | 37.5 units | 75 units |
| 5 mL | 0.4 mg/mL | 4 mcg | 25 units | 62.5 units | Over 100 units |
Results under about 2 units are hard to measure accurately on a syringe, and anything over 100 units will not fit a 1 mL syringe. Both are signs that a different volume of liquid would suit that dose better. That choice belongs to your pharmacist or prescriber.
How many doses are in a 2 mg vial?
| Dose | Doses per vial | At one dose a day | At one dose a week |
|---|---|---|---|
| 100 mcg | 20 | 20 days | 20 weeks |
| 250 mcg | 8 | 8 days | 8 weeks |
| 500 mcg | 4 | 4 days | 4 weeks |
The number of doses depends only on the vial strength and the dose. Adding more or less liquid changes the volume of each dose, not how many there are. A reconstituted vial may reach the end of its usable period before it is empty, so check the label. For other schedules, use the vial duration calculator.
The formula
- Concentration: 2 mg ÷ liquid added (mL) = mg per mL.
- Volume: dose (mg) ÷ concentration (mg/mL) = mL.
- Units: volume (mL) × 100 = units on a U-100 syringe.
Worked through for 250 mcg with 2 mL added: 2 ÷ 2 = 1 mg/mL. 0.25 mg ÷ 1 = 0.25 mL. 0.25 × 100 = 25 units.
Questions about a 2 mg vial
How much bacteriostatic water do I add to a 2 mg vial?
There is no single correct amount. The volume you add sets the concentration: 1 mL in a 2 mg vial gives 2 mg/mL, 2 mL gives 1 mg/mL and 3 mL gives 0.67 mg/mL. More liquid makes each dose a larger volume that is easier to measure. Use the volume on the product label or the one your pharmacist or prescriber gives you.
How many units is 250 mcg from a 2 mg vial?
It depends on how much liquid was added. With 1 mL added it is 12.5 units on a U-100 syringe, with 2 mL it is 25 units and with 3 mL it is 37.5 units.
How many doses are in a 2 mg vial?
A 2 mg vial holds 2,000 mcg. That is 20 doses of 100 mcg, 8 doses of 250 mcg or 4 doses of 500 mcg. The amount of liquid added does not change the number of doses.
How many mcg are in a 2 mg vial?
A 2 mg vial contains 2,000 mcg, because 1 mg equals 1,000 mcg.
Other vial sizes
This page does unit arithmetic. It does not tell you what dose to take or how much liquid to add. Confirm both with your prescriber or pharmacist.
Save this vial in the app
PepVault keeps each vial's strength, status, expiry date and remaining supply next to your dose log. Free for Android, iPhone, iPad and Mac.
For Android, iPhone, iPad and Mac. On the App Store the app is listed as PeptideMate.