At a glance
| Concentration | 15 mg is | Mark on U-100, 1 mL |
|---|---|---|
| 4.17 mg/mL Zepbound 10 mg multi-dose vial | 3.597 mL | does not fit (over 1 mL) |
| 5 mg/mL Zepbound 2.5 mg single-dose vial | 3 mL | does not fit (over 1 mL) |
| 8.33 mg/mL Zepbound 20 mg multi-dose vial | 1.801 mL | does not fit (over 1 mL) |
| 10 mg/mL Zepbound 5 mg single-dose vial | 1.5 mL | does not fit (over 1 mL) |
| 12.5 mg/mL Zepbound 30 mg multi-dose vial | 1.2 mL | does not fit (over 1 mL) |
| 16.7 mg/mL Zepbound 40 mg multi-dose vial | 0.898 mL | 90 (exactly 89.82) |
| 20 mg/mL Zepbound 10 mg single-dose vial | 0.75 mL | 75 |
| 25 mg/mL Zepbound 12.5 mg single-dose vial and 60 mg multi-dose vial | 0.6 mL | 60 |
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 vial
15 mg is the highest labelled Zepbound strength. From the 15 mg single-dose vial, 30 mg/mL, it is the whole 0.5 mL: the 50 mark. From the 60 mg multi-dose vial, 25 mg/mL, it is the labelled 0.6 mL withdrawal: the 60 mark. Because the concentrations are high, small errors in the mark are large errors in milligrams: one unit on the syringe is 0.3 mg at 30 mg/mL and 0.25 mg at 25 mg/mL. That is the practical reason a 1 mL syringe marked every 2 units is a coarse tool at this strength, and why the drawn syringe on this site shows the exact value beside the rounded mark. The table below also shows what 15 mg would be at the lower Zepbound concentrations: over 1 mL at 4.17, 5, 8.33, 10 and 12.5 mg/mL, so it cannot be drawn from those vials in one syringe.
The mistake to watch for. 15 mg at 25 mg/mL and 12.5 mg at 20.8 mg/mL are both the 60 mark. The mark alone does not tell you which dose you drew; the vial does. Keep the box with the vial until the vial is finished.