Overview
Seeing a small amount of liquid left in your MedExpress Mounjaro® pen after completing all four weekly doses is normal and expected — this article explains why, whether that remaining liquid should be injected, and when to dispose of the pen.
Use this article when you want to:
Understand why residual liquid remains in a Mounjaro® pen
Find out whether the remaining liquid should be injected
Know when to dispose of your Mounjaro® pen
Why Does Residual Liquid Remain in My Mounjaro® Pen?
Each Mounjaro® pen contains a small additional volume of medication beyond the four scheduled weekly doses. This extra liquid ensures:
Your full weekly dose is delivered accurately
Priming the pen does not reduce your intended treatment dose
Dosing remains consistent and reliable
Because of this design, a small amount of liquid may still be visible in your Mounjaro® pen after your final dose.
Should I Inject the Remaining Liquid?
No. The remaining liquid in a finished Mounjaro® pen is not measured for dosing and must not be injected.
After four completed weekly doses, your Mounjaro® pen is considered finished, even if liquid is still visible.
When Should I Dispose of My Mounjaro® Pen?
You should dispose of your MedExpress Mounjaro® pen when either of the following happens first:
All four weekly doses have been used
30 days have passed since first use
Safe disposal should follow sharps container guidance for injectable medications.