Mounjaro Pen Malfunction: 4 Steps to Take If It Happens

Mounjaro Pen Malfunction

The Mounjaro Pen is a cutting-edge medical device designed for diabetes management and has changed the way patients handle their insulin therapy. But, like any fancy gadget, it can have problems sometimes.

Facing a malfunction with your Mounjaro pen can be a bit of a concern, especially considering its importance to your health. Don’t worry if it happens, because there are steps you can take to address the situation.

In this article, we’ll explore the four crucial steps you should take if your Mounjaro pen malfunctions. We will also guide you on how to troubleshoot the issue and give you a step-by-step guide on how to use this pen safely to prevent future malfunctions.

The Mounjaro Pen, known generically as Tirzepatide, is a single-dose pre-filled pen optimized for the treatment of type 2 diabetes. The pen has a secret needle that goes into your skin when you press the injection button and automatically retracts the needle once the injection is finished.

This injection given once a week acts like specific hormones that help control blood sugar levels, making it easier for patients to manage their glucose levels.

Tirzepatide doesn’t just help with diabetes, it can also help with weight loss. Remember, while the Mounjaro Pen is a big step forward in diabetes care, it’s essential to handle and use the device correctly for it to work effectively.

Do not use your Mounjaro pen if:

Stop using the Mounjaro pen and consult your healthcare provider immediately if you experience any of these symptoms:

  • It appears damaged or broken. Visual inspection can reveal cracks, leaks, or other damage that might affect the pen’s performance.
  • The medication is cloudy, colored, or contains particles. Mounjaro should be clear and colorless. Any deviation from this might indicate contamination or expiration.
  • It is past its expiration date. Using the pen beyond its advised shelf life can reduce efficacy or increase risks.
  • You have already used it. The Mounjaro Pen is designed for single use to ensure sterility and accurate dosage.

How Do Self-Injection Pens Work?

Self-injection pens, like the Mounjaro Pen, utilize smart technology to deliver medication directly into the patient’s body in a controlled and safe manner. The basic working principle of these pens is relatively simple but highly effective.

Each pen contains a pre-measured dose of medication which ensures that the patient receives the exact amount required for treatment. When you push the injection button, a hidden needle comes out and goes under your skin to give you the medicine.

Its primary goal is to reduce your pain and discomfort, making it easier for patients to administer their own medication with precision and confidence.

After the medication is delivered, the needle retracts back into the pen and which reduces the risk of needle-stick injuries.

Signs of a faulty Mounjaro pen

Identifying a faulty Mounjaro pen is necessary to ensure that you are receiving the full therapeutic benefits of the medication without risking your health.

Here are some common signs that may indicate your Mounjaro pen is not functioning correctly:

1. Failure to deliver medication: If you press the injection button and the dose counter does not change, or you do not feel the needle entering your skin, the medication may not be administered properly.

2. Leakage of medication: Any sign of medication leakage from the pen either before or after the injection process could indicate a seal issue or damage to the pen.

3. Unusual resistance when pressing the injection button: Difficulty in pressing the injection button or unusual resistance during the injection process could be a sign of internal problems with the pen mechanism.

4. The dose counter does not work correctly: The dose counter should clearly indicate the amount of medication being administered. Any malfunction in the dose counter can lead to incorrect dosage.

5. Pain or discomfort during injection: While some discomfort is normal, excessive pain or discomfort could be an indication that the pen’s needle is not functioning as intended.

If you experience any of these issues, it’s important to stop using the pen immediately and contact your healthcare provider.

Common causes of Mounjaro Pen Malfunction

There are many reasons why a Mounjaro Pen might malfunction, which could compromise its effectiveness and safety. Here are some of the most common causes:

1. Improper Storage: Mounjaro Pens require specific temperature conditions for optimal functioning. Storing the pen outside the recommended temperature range (36°F to 46°F) can damage the medication and affect the pen’s mechanism [1].

2. Expired Medication: Using a pen with expired medication can cause a malfunction. The chemical composition of the medication might change over time, affecting how it’s delivered.

3. Mechanical Failure: Sometimes, even though we check these pens carefully, things can still go wrong. For instance, the button might get stuck, the needle could break or the dose indicator might not work.

4. Air Bubbles: If air bubbles are present in the cartridge, it can prevent the medication from being delivered correctly. This is often due to improper priming of the pen before use.

5. Incorrect Usage: Not following the guidelines for correct pen usage can lead to malfunctions. This includes not cleaning the injection site or the pen properly, using the pen at an incorrect angle, or not holding the button down for the entire dose.

Knowing about these possible problems can help users stop them from happening and make sure their pen is always good to use. If something goes wrong even after being careful, it’s important to ask doctors or the company for help.

Related: Wegovy Pen Malfunction: 4 Steps to Take If It Happens

4-Steps to Take for Mounjaro Pen Malfunction

How to fix Mounjaro Pen Malfunction

If you find yourself facing a Mounjaro pen malfunction, the following steps can help you address the situation promptly and effectively:

Step 1: Stay Calm and Assess the Situation

The first thing to do is stay calm. If something goes wrong, it doesn’t mean your health plan has to be ruined. First, check what’s going on with your Mounjaro pen. Is the injection button stuck? Is the needle not going back in? Or is the dose not coming out right? Figuring out the exact problem will help you find a solution faster. And remember, stress can make it hard to think clearly and fix the problem.

Step 2: Diagnose the Problem

Once you’ve identified the issue with your Mounjaro pen, try to diagnose the problem more deeply. Is this issue one you can resolve on your own, like removing air bubbles or ensuring the pen is at the correct temperature? Or is the malfunction more complex, requiring professional attention?

Check the pen’s instruction manual for troubleshooting tips specific to the problems you’re encountering. If the manual doesn’t offer a solution, or if the problem seems to be a mechanical failure or related to the medication itself, it’s time to move to the next step. Remember, accurate diagnosis is vital for effective resolution and to prevent compromising your treatment.

Step 3: Correct and Retry

If you figure out what’s wrong with your Mounjaro Pen, check the instruction manual or use your own know-how about how to use and care for the pen to fix the problem.

This might involve checking for and removing any air bubbles in the cartridge, ensuring the pen is at the correct temperature, or correctly priming the pen before use. Once you’ve made the necessary adjustments, attempt to use the pen again cautiously.

If the pen still doesn’t work after you try to fix it, don’t keep trying the same thing over and over. This might harm the pen more or affect your medication. If this happens, make sure to have a spare pen ready or use a new one if you can. Always have an extra pen with you to avoid any problems with your treatment.

Step 4: Seek Medical Assistance if Necessary

If the problem continues after all attempts to correct it, it’s crucial to seek medical assistance without delay. Contact your provider or the pen’s manufacturer for further guidance. They can provide advice on how to manage your medication in the meantime and may replace the malfunctioning pen if necessary.

Also Read: How To Get Mounjaro 12 Month Coupon? (2024)

How to use Mounjaro Pen: Step-by-Step Guide

Proper usage of the Mounjaro Pen is crucial for ensuring effective medication delivery and minimizing the risk of malfunctions. Here is a detailed step-by-step guide to correctly use your Mounjaro Pen:

  • Get Your Stuff Ready: Before you start, make sure you have your Mounjaro Pen, a new needle, and alcohol wipes. It’s also good to have your medicine log nearby to write down your dose.
  • Check the Medicine: Look at the pen to see if the medicine is clear and clean, without any weird things in it. If it looks strange, don’t use the pen.
  • Put on the Needle: Wash your hands well. Clean the rubber part of the pen with an alcohol wipe. Put the needle on by screwing it onto the pen.
  • Get the Pen Ready: You need to get rid of air bubbles and make sure the medicine comes out right. Point the pen up, tap it gently, then press the button until you see a drop at the tip of the needle. You might need to do this a few times. If nothing comes out, check the pen and maybe use a new one.
  • Set Your Dose: Turn the dose knob to the right amount. If you go too far, you can turn it back without wasting any.
  • Choose Where to Inject: You can inject in your thigh, belly, or upper arm. Clean the skin where you’ll inject it and let it dry.
  • Give Yourself the Shot: Take off the needle caps. Put the needle in your skin the way your doctor showed you. Press the button and count slowly to 10 to get all the medicine out.
  • Throw Away the Needle Safely: After you inject, put the outer cap back on without touching the needle. Get rid of the needle in a safe container.
  • Store the Pen Right: Put the cap back on the pen after using it. Store it like the instructions say, either in the fridge or at room temperature in a safe place. Don’t freeze it.

Remember, always follow your healthcare provider’s instructions or consult the pen’s instruction manual for any specific steps or precautions to take before using the Mounjaro Pen.

Preventative measures to avoid Mounjaro Pen Malfunction

To maximize the effectiveness of your Mounjaro Pen and minimize the risk of malfunction, follow these preventative measures:

1. Regular Maintenance: Regularly inspect your pen for any signs of damage or wear. Ensure it’s always clean and store it according to the manufacturer’s instructions.

2. Proper Storage: Store your pen in a cool, dry place away from direct sunlight. If refrigeration is required, ensure it’s not stored in the freezer.

3. Use as Directed: Only use the Mounjaro Pen for its intended purpose and administer it as prescribed by your healthcare provider.

4. Avoid Sharing: Never share your pen with others, even if the needle is changed, to prevent contamination and the spread of infection.

5. Keep Spares Handy: Always have an extra pen available in case of an emergency or malfunction to ensure your treatment is not interrupted.

Can I send my Mounjaro pen back if it malfunctions?

Yes, if your Mounjaro Pen malfunctions, it’s important to know that you might be eligible to return it for a replacement.

However, the process for returning a defective pen and receiving a new one varies depending on the manufacturer’s policy and where you obtained the pen.

1. Contact the Manufacturer: First, reach out to the manufacturer’s customer service department. Eli Lilly and Company, the maker of Mounjaro, provides clear instructions and assistance for addressing any product-related problems. You can find contact details on their official website, such as phone numbers and an email address for inquiries.

2. Pharmacy Return Policies: If you purchased the pen from a pharmacy, check their return policy regarding defective medical devices. Some pharmacies may facilitate the exchange process on your behalf, simplifying the steps you need to take.

3. Documentation and Proof: Be prepared to provide documentation of the malfunction, like photos or a detailed description, and proof of purchase. This documentation is crucial for verifying the issue and processing your request for a replacement.

5. Replacement Process: When a complaint is received, manufacturers check why it’s not working. If it’s a problem with how it was made, they’ll give you a new pen for free.

For the most accurate and updated information regarding the return and replacement of a malfunctioning Mounjaro Pen, it’s best to consult directly with Eli Lilly and Company or your healthcare provider.

Also Read: Does Blue Cross Blue Shield Cover Mounjaro For Weight Loss


To make sure your Mounjaro Pen works well for your treatment, follow the simple steps in the guide and prevent any issues. This way, you can make the most of this new medication system. If you face any problems, contact the right people to keep your treatment on the way. Your health and safety matter most, so stay informed, and ready, and keep in touch with your healthcare provider.


How to Report a Defective Mounjaro Pen?

If you encounter a defective Mounjaro Pen, report it to the manufacturer, Eli Lilly and Company, through their customer service. Provide detailed information about the issue, along with any relevant documentation and proof of purchase, to facilitate the replacement process.

What Do I Do If My Mounjaro Needle Is Bent?

A bent needle can cause unreliable dosing and discomfort during injection. If you notice that your Mounjaro needle is bent, do not attempt to straighten it as this can cause damage to the pen and compromise its function. Instead, safely dispose of the needle according to the provided guidelines and use a new, undamaged needle for your next injection. If this occurs regularly, you should discuss it with your provider to ensure proper technique and potentially consider the root cause of the bending.



The information provided in this article is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Don’t ignore professional medical advice or put off seeking it just because of something you read here. Although we aim to offer precise and current information, we do not guarantee its completeness, accuracy, reliability, suitability, or availability for any purpose. Using the information in this document is at your own risk. We are not responsible for any losses or damages caused by our content.

Sharing is Caring

Leave a Comment

Related Articles