Seeing a small amount of liquid remaining in a Mounjaro® pen after completing all four weekly doses is normal and expected.
Overview
This article explains:
Why residual liquid remains in a Mounjaro® pen
Whether the remaining liquid should be injected
When the Mounjaro® pen should be disposed of
Use this information to understand normal Mounjaro® pen design and dosing.
Why residual liquid remains in a Mounjaro® pen
Each Mounjaro® pen contains a small additional volume of medication beyond the four scheduled doses.
This extra liquid ensures:
The full weekly dose is delivered accurately
Priming the pen does not reduce the intended treatment dose
Dosing remains consistent and reliable
Because of this design, a small amount of liquid may still be visible after the final dose.
Should the remaining liquid be used?
No. The remaining liquid in a finished Mounjaro® pen is not measured for dosing and must not be injected.
After four completed weekly doses, the Mounjaro® pen is considered finished, even if liquid is still visible.
When to dispose of the Mounjaro® pen
A Mounjaro® pen should be disposed of when:
All four weekly doses have been used, or
30 days have passed since first use,
whichever occurs first.
Safe disposal should follow sharps container guidance for injectable medications.
Key takeaway
Residual liquid in a Mounjaro® pen after four doses is normal.
The remaining liquid must not be injected.
The pen is finished after four doses or 30 days from first use and should then be disposed of safely.
If you still need help after reviewing the information above, additional assistance is available.