Why might your Mounjaro pen seem jammed?

When using a Mounjaro pen, encountering a jammed pen can be confusing - especially if you're unsure whether you’ve taken your final dose.

Here’s what you need to know.

1. You’ve already taken all four doses

Mounjaro pens are designed to deliver precise doses of tirzepatide. After completing all four doses, the pen’s safety mechanism prevents further doses to avoid overdosing. If you can’t dial another dose but see leftover liquid, it’s because the pen has already delivered the intended 2.4ml (0.6ml per dose). The remaining liquid is not meant for use and ensures accurate priming.

2. Leftover liquid causing confusion

Each pen contains more liquid than needed for four doses, leading to leftover liquid after the final dose. This often leads patients to think they missed a dose. Rest assured, if you’ve used the pen four times, it has delivered the full course of treatment. Logging your doses or consulting a clinician can confirm this.

3. Needle attachment issues

If the pen doesn’t inject, it could be due to the needle not being securely attached. Ensure the needle is straight, twisted firmly onto the pen, and that both caps (outer and inner) are removed. A loose or blocked needle will prevent medication flow.

4. A blocked or faulty needle

A faulty or blocked needle may also cause injection issues. Replace the needle with a new one, ensuring it’s securely attached and primed correctly. This simple fix often resolves injection problems.

5. Suspected pen malfunction

If you’ve followed all the steps—checked the needle, replaced it, removed caps, and confirmed you haven’t completed all four doses—but the pen still doesn’t work, there might be a malfunction. In this case, contact our clinical team for guidance or a replacement.

How to troubleshoot a jammed pen

If your pen won’t inject, follow these steps:

1. Check the needle attachment: Ensure the needle is secure and both caps are removed.

2. Try a new needle: Replace the needle and prime it correctly.

3. Contact the clinical team: If the pen still doesn’t work, reach out for support.

How to avoid future confusion

• Track your doses carefully: Use the app to log each injection.

• Understand pen mechanics: Leftover liquid is normal and doesn’t indicate a missed dose.

• Review instructional resources: Follow step-by-step guides to ensure proper use.

What if there’s more liquid than expected or you haven’t completed four doses?

If you notice an unusual amount of liquid after four doses or suspect your pen isn’t functioning correctly, contact our clinical team. They can assess the issue and provide further support to ensure you receive the proper dosage.

The numan take

If your Mounjaro pen seems jammed after four doses, it’s likely working as intended. The pen’s design ensures accurate dosing, even if liquid remains. For any concerns, our clinical team is here to help.