Units to mg: how to read a compounded GLP-1 dose
On a U-100 syringe, 100 units is 1 mL, so milligrams = units ÷ 100 × the vial's strength in mg/mL. The same number of units is a different dose in a different strength of vial.
Units to mg converter for a U-100 syringe.
20 units of a 2.5 mg/mL vial is 0.5 mg (0.2 mL).
Arithmetic only, not dosing advice. Check every new vial's strength and your dose with your prescriber or pharmacist.
Why it matters
Compounded semaglutide and tirzepatide come in multi-dose vials, and the strength varies by pharmacy and sometimes by refill. The FDA has reports of people hospitalized after measuring the wrong dose. Read the mg/mL on every new vial and check the dose with your prescriber or pharmacist.
Two cash programs to check.
No insurance needed.
- Check price →
- Check price →SnagRx's homepage shows its 12-month prepaid prices first
What it means for the price
A program's price covers a number of milligrams a month. A higher-strength vial does not mean more drug unless the total mg is higher. Compare programs on the monthly price at your dose.
Questions
How many units is 0.25 mg of semaglutide?
It depends on the vial. At 2.5 mg/mL, 0.25 mg is 10 units. At 5 mg/mL it is 5 units.
How many mg is 20 units?
At 2.5 mg/mL, 20 units is 0.5 mg. At 5 mg/mL it is 1 mg. At 10 mg/mL it is 2 mg.
Sources
Prices on GLP Chart are read from each program's own pricing page. How: how we check prices. Every program's price this month: the GLP-1 price index.