It’s common to have questions when using a Mounjaro pen for the first time - especially if you notice liquid left inside after you’ve taken all your doses. This can be confusing, but in most cases, it’s completely expected and built into the design.
Liquid left in your pen is normal, in most cases, this does not mean a dose was missed
Pens contain additional liquid to allow for priming
Here’s what it means - and when it’s time to throw the pen away
Mounjaro (tirzepatide) comes as a multi-dose pre-filled pen for subcutaneous injection (into the fatty tissue beneath the skin). It’s used to treat type 2 diabetes as well as a treatment for weight management. Each pen contains multiple doses and is designed for ease of use, helping patients administer their medication correctly.
Seeing liquid left in your Mounjaro pen after all four doses is completely normal.
Here’s why:
Each Mounjaro pen contains 3ml of liquid.
It’s designed to deliver 0.6ml per dose, providing four doses per pen.
The pen holds more than 2.4ml of usable liquid to ensure there’s enough for priming before each dose.
After you’ve used all four doses, it’s normal to see some liquid left in the pen. This means it worked correctly.
You won’t be able to dial another full dose, so it’s time to throw the pen away, even if there’s some liquid still inside.
If you’re concerned about the amount of liquid left in your pen, consult one of our clinicians. They can confirm whether your pen is functioning properly and provide guidance on your technique. Always follow the instructions provided with your pen and the patient information leaflet.
For a detailed step-by-step guide on how to use the Mounjaro pen, watch the instructional video below. This video will walk you through the process, ensuring you’re confident and using it correctly.
This video is for guidance only. Always follow the instructions provided with your own pen.
Having a small amount of liquid left in your Mounjaro pen after the fourth dose is to be expected. The design ensures you receive all four complete doses even if some medication remains.
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