At a glance
| Concentration | 0.25 mg is | Mark on U-100, 1 mL |
|---|---|---|
| 1 mg/mL | 0.25 mL | 25 |
| 2 mg/mL | 0.125 mL | 13 (exactly 12.5) |
| 2.5 mg/mL | 0.1 mL | 10 |
| 5 mg/mL | 0.05 mL | 5 |
| 10 mg/mL | 0.025 mL | 3 (exactly 2.5) |
Arithmetic at the concentrations shown. The concentration on your own label is the one that counts; enter it in the calculator.
Why the answer depends on the pharmacy label
0.25 mg is the smallest strength on the Wegovy and Ozempic labels, and it is the dose most likely to run into the limits of an insulin syringe. At 5 mg/mL, a common compounded concentration, 0.25 mg is 0.05 mL: the 5 mark. At 10 mg/mL it is 2.5 units, between marks on a 1 mL syringe and readable only on the 0.3 mL syringe with half-unit marks. At 1 mg/mL it is a comfortable 25 units. The higher the concentration, the smaller and harder to read the draw, and at some point the calculator refuses it as below the smallest mark. If that happens with your label's concentration, the answer is not a smaller syringe you do not have; it is a conversation with the pharmacy that chose the concentration.
The mistake to watch for. A tiny draw invites rounding up. 2.5 units read as 3 is a 20 percent overdose. The drawn syringe shows the exact value beside the mark for exactly this case, and on a 1 mL syringe it tells you which two marks the value sits between.