Zepbound single-dose vial: syringe units, logging and site rotation
A Zepbound single-dose vial arrives as a ready solution, so there is nothing to mix and no reconstitution maths. This page covers what the vial holds, how 0.5 mL reads on a syringe, how PinTrax logs the vial, and how to rotate sites, with each label fact cited to the FDA prescribing information.
What a Zepbound vial holds
Each Zepbound single-dose vial holds 0.5 mL of solution, in six strengths (FDA prescribing information for Zepbound, revised August 2026):
| Strength | Volume in the vial |
|---|---|
| 2.5 mg | 0.5 mL |
| 5 mg | 0.5 mL |
| 7.5 mg | 0.5 mL |
| 10 mg | 0.5 mL |
| 12.5 mg | 0.5 mL |
| 15 mg | 0.5 mL |
The whole 0.5 mL is one dose. The single-dose vial Instructions for Use in the same label have you draw to the 0.5 mL line, and say to "Throw away all opened vials after use, even if there is medicine left in the vial."
Storage, from the label: keep unopened vials in a refrigerator at 2°C to 8°C (36°F to 46°F). If needed, a single-dose vial can be kept unrefrigerated at up to 30°C (86°F) for a total of 21 days, and the label says to discard it after 21 days at room temperature.
Reading 0.5 mL on a syringe
The label tells people using Zepbound vials to use "a syringe appropriate for dose administration (e.g., a 1 mL syringe capable of measuring a 0.5 mL or 0.6 mL dose)" and to "always use a new syringe and needle for each injection."
| Syringe | 0.5 mL reads as |
|---|---|
| U-100 | 50 units |
| U-50 | 25 units |
| U-40 | 20 units |
That is arithmetic from the syringe scale, not a dose instruction. It is an arithmetic illustration, not a suggestion.
Syringe markings are units, not millilitres, and the conversion depends on which syringe you own. A U-100 syringe has 100 units per ml, so one unit is 0.01 ml. A U-50 has 50 units per ml and a U-40 has 40, so the same volume reads as a different number on each.
Logging a vial in PinTrax
Add it as a vial: enter the label amount, for example 2.5 mg, and the expiry date from the carton, and leave the reconstitution fields empty, since the solution is ready to use. Log each dose in mg. PinTrax tracks a vial by amount, so after one full dose a 2.5 mg vial reads 0.00 of 2.50 mg, with low warnings before you run out, and it marks a vial expired once the date has passed. Pens work differently: pens are counted in doses, because "three of four left" is the thing you need to know. Using a pen instead? See the pen guide. There are private notes for source, batch, and price, for your records only.
Rotating sites
The label says to inject into the abdomen or thigh, or to have another person inject into the back of the upper arm, and to "Rotate injection sites with each dose" (FDA prescribing information for Zepbound).
PinTrax records the exact spot you tap on a 26-zone body map, warns when a tap falls within about 1.4 cm (on a 175 cm body) of any injection from the last 14 days, and suggests the zone that has rested longest. The spacing research is in injection site rotation.
Questions
How many units is 0.5 mL on an insulin syringe?
0.5 mL is 50 units on a U-100 syringe, 25 on a U-50 and 20 on a U-40. The volume is the same on each; only the printed scale differs, so read the scale on the syringe in your hand.
Can I use half a Zepbound vial and keep the rest?
Each single-dose vial is one 0.5 mL dose, and the label says to "Throw away all opened vials after use, even if there is medicine left in the vial." That instruction is in the single-dose vial Instructions for Use within the FDA prescribing information.
Does PinTrax need a reconstitution calculator for a Zepbound vial?
No: a Zepbound single-dose vial holds 0.5 mL of ready solution, so there is nothing to mix. The reconstitution calculator is for powder vials that you mix with bacteriostatic water.