If you are looking for how to reset your Mounjaro pen or searching for a reset button, the answer is simple: there is no reset button and there is no electronic reset function. The Mounjaro KwikPen is a mechanical injection device.
If you are using Mounjaro and the pen will not turn, will not deliver a dose or seems faulty, this guide explains how the pen works, some possible reasons it may not work as expected, why it cannot be reset and what you can do next. It also covers priming, using the pen again after a break and what to do if you think your pen is faulty. These steps can help you avoid wasting medicine, using unnecessary force or handling the pen incorrectly.
There Is No Reset Button on the Mounjaro Pen
Let us clear this up first. The Mounjaro KwikPen does not have a reset button or an electronic reset function. It is a mechanical multi dose injection pen. If the pen is not working as expected, follow the Instructions for Use supplied with your pen and contact your pharmacy or Lilly if the problem cannot be resolved.
This means there is no reset process you need to perform. If your pen seems stuck or is not working normally, do not look for a hidden reset button or try to force the mechanism. Instead, check the basic steps in the Instructions for Use and get advice if the problem continues.
How the Mounjaro KwikPen Actually Works
The KwikPen is a multi dose pen that contains four once weekly doses. In simple terms, and while following the Instructions for Use supplied with your pen, each injection involves attaching a new compatible needle, priming the pen, dialling the dose and injecting.
A few key points about how it works:
- It delivers a fixed dose. Each KwikPen contains four doses of the prescribed strength. Before each injection, you turn the dose knob until the dose window shows "1", which represents one full dose.
- It holds four doses. After the fourth weekly dose, the pen is finished and should be discarded according to the Instructions for Use, even if some liquid appears to remain.
- The markings are not a dose gauge. You should not use the amount of liquid you can see in the pen to work out how many doses remain. Keep track of how many injections you have taken instead.
"My Pen Dose Knob Will Not Twist to 1" or "Will Not Turn"
This is a common question. The KwikPen has a dose window that shows "1" when a full dose has been dialled. If you cannot turn the dose knob until "1" appears, do not force it. Follow the troubleshooting instructions supplied with the pen and contact your pharmacy or Lilly if the problem continues.
If your pen will not turn or will not deliver a dose, some possible reasons include:
- The needle may be missing, blocked or incorrectly attached. The pen requires a new compatible needle for each injection. If the needle is blocked or has not been attached correctly, medicine may not flow as expected. If you are unsure, follow the Instructions for Use and use a new compatible needle.
- The pen may not have been primed correctly. The KwikPen should be primed before each injection according to the Instructions for Use.
- All four doses may have been used. Once all four doses have been administered, the pen is finished. It may then feel as though the mechanism is stuck, but this can simply mean the pen has reached the end of its intended use.
Do not force the dose knob or injection button if they will not move as expected.
Why Online "Reset" Advice May Not Apply
You may find online advice about resetting or unsticking injection pens. Some of this advice may relate to other types of pens, including variable dose insulin pens. The Mounjaro KwikPen works differently, so instructions intended for another type of pen may not be suitable.
Do not repeatedly move the dose knob back and forth or try to force the injection button to make the pen work. This could interfere with how the pen operates or result in medicine being wasted.
If your Mounjaro pen is not working as expected, follow the Instructions for Use rather than trying an unofficial reset method.
What to Do If Your Pen Is Not Working
Work through these simple checks:
- Check the needle. Make sure a fresh, compatible needle is correctly attached. If you are unsure whether the needle is blocked or attached properly, follow the Instructions for Use and use a new needle if appropriate.
- Prime the pen. Follow the Instructions for Use carefully. During priming, you should see a small amount of medicine at the needle tip when the pen has been successfully primed. If medicine does not appear after following the specified steps, follow the troubleshooting instructions or contact your pharmacy or Lilly.
- Count your doses. If you have already had four injections from the pen, it has reached the end of its intended use and you need a new pen for your next dose.
- Do not force the pen or take it apart. If the pen still does not work after you have followed the relevant instructions, do not force the device or try to disassemble it. After each injection, remove the needle and dispose of it in a suitable sharps container. Do not store the KwikPen with a needle attached.
If you believe the pen is faulty, stop using it and contact your pharmacy or the manufacturer for advice. Do not try to reset or repair the pen yourself.
What Is the Flow Test or Priming?
The "flow test" people often search for is the priming or safety check carried out before each injection. It is a normal part of using the pen rather than a way to repair it.
Before each injection, prime the pen as described in the Instructions for Use. During priming, hold the pen with the needle pointing upwards and gently tap the cartridge holder to help move any air bubbles to the top.
A small amount of medicine appearing at the needle tip shows that the pen has been successfully primed. You do not need to see a stream of medicine.
If medicine does not appear after you have followed the priming instructions, follow the troubleshooting steps in the Instructions for Use or contact your pharmacy or Lilly for advice.
Do Not Take the Pen Apart
Some people search for information about Mounjaro pen parts or how to take the pen apart. Please do not attempt to take your Mounjaro pen apart.
The pen is not designed to be repaired by the user. Taking it apart could cause damage, contamination or problems with dose delivery. There is no internal reset mechanism that you can adjust yourself.
If the pen appears faulty or has visible damage, stop using it. Keep the pen and contact your pharmacy or the manufacturer for advice rather than trying to open or repair it yourself.
Restarting Mounjaro After a Break
If your search is really about restarting Mounjaro after a gap, such as three months, that is a treatment question rather than a pen reset question.
If you have stopped Mounjaro for an extended period, speak to your prescriber before restarting. They can advise whether you should restart at a lower dose and how your treatment should be adjusted. This may be particularly important if you have been using Mounjaro for weight loss, rather than simply returning to your previous dose.
Do not assume that you should restart at the same dose you were using before the break. You should also check that any stored pen has been kept according to the storage instructions and has not expired.
When to Report a Faulty Pen
If you believe your pen is faulty, stop using it and contact your pharmacy or the manufacturer for advice. If you experience a suspected adverse reaction to Mounjaro, you can also report it through the MHRA Yellow Card Scheme.
If there is visible damage or the pen appears jammed, do not force it. Stop using it and seek advice from your pharmacy or another appropriate healthcare professional.
UK health authorities have also warned about falsified GLP 1 medicines supplied outside the regulated pharmacy system. If your pen looks unusual or did not come from a registered pharmacy, do not use it until you have received appropriate advice.
If the basic troubleshooting steps do not resolve the problem, your pharmacy or the manufacturer can advise you on what to do next.
