Troubleshooting Common Issues with Your Weight Loss Injection Pen

If you’re experiencing trouble with your weight loss injection pen, don’t worry! Here are some simple solutions to common issues:

Why Won’t the Pen Twist or Push Down?

If you are experiencing the following with your pen the medication within the cartridge is likely to be over pressurised. The increased pressure in the cartridge causes the device internal mechanism to jam and not to function properly. This is not a manufacturing defect.

  • The dose knob does not depress completely.
  • The dose knob does not have the typical audible click while dialling or the click sound is abnormal (muted).
  • The dose knob does not dial or is difficult to dial.

If you encounter any of the difficulties listed above, change the pen needle and prime the KwikPen until medicine is seen at the tip of the needle.


If you require more needles, spares can be purchased on our website.

My Pen Is Empty, but I’ve Only Had 1/2/3 Doses – Why?

The pen is designed to provide four full doses, but if it’s empty before then, it may be due to over-priming or accidentally administering a higher dose in a previous injection. Follow the dose settings and priming instructions carefully to avoid this in the future.


Please note; even after you have used all 4 doses there will still be some residue left and that remainder is not a dose. For further information check out the blog here

Mounjaro pen

Even experienced users can sometimes encounter difficulties, so as a reminder:

  • Always prime your KwikPen before every injection. Priming confirms that the medicine is flowing freely through the needle thus ensuring you receive the dose that you dialled.
  • Always use a new needle for every injection to help prevent infections and blocked needles. Do not reuse or share your needles with other people. You may give other people a serious infection or get a serious infection from them.
  • Make sure that a needle is properly attached, and not bent or damaged. If the dose knob is pressed without a needle attached, this increases the pressure within the cartridge causing the pen to jam.
  • As you inject, press the dose knob slowly. After the dose knob is fully depressed, slowly count to five to ensure you receive the dose you dialled.
  • Protect your KwikPen from materials like dirt, sand, dust, lint, crumbs, and spilled liquids. Over time these materials may enter the internal mechanism causing the KwikPen to malfunction.

What if I’ve Tried Everything and the Pen Still Won’t Work?

If you’ve checked the needle, tried a new one, primed correctly, and followed all instructions but the pen still doesn’t work, please reach out. Sending us a short video of the issue will help us assist you quickly.


When making videos, please show as much detail as possible as regards to the issue i.e. cap off, needle on without security cap etc.


We hope these tips make using your injection pen smoother, so you can stay on track with your weight loss journey!

Mounjaro pen

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