If you are using the Mounjaro KwikPen, you need a new pen needle for each injection. Used pen needles should not be reused. Reusing a needle can make injections more uncomfortable and may increase the risk of problems such as needle damage, blockage or contamination.
For adults in the UK who are using or have been prescribed the Mounjaro KwikPen, some common questions include:
- Does the Mounjaro KwikPen come with needles?
- Which needles fit the pen?
- Can I reuse a Mounjaro needle?
- What should I do if the needle bends?
- Which needle size should I use?
This guide explains what you need to know about Mounjaro pen needles, including compatibility, needle use, safe injection technique, disposal and travelling with your pen.
Does the Mounjaro KwikPen Come with Needles?
No. Needles are not included with the Mounjaro KwikPen pack.
The Mounjaro KwikPen is designed to be used with compatible screw on pen needles. Your doctor, pharmacist or nurse can advise you on which needle to use with your pen.
If you receive Mounjaro from an online pharmacy, check whether pen needles are supplied as part of the service. If they are not, your pharmacist can advise you about getting suitable needles.
Which Needles Fit the Mounjaro KwikPen?
The Mounjaro KwikPen uses screw on pen needles. The manufacturer advises speaking to your doctor, pharmacist or nurse about the appropriate needle to use with your KwikPen.
Do not assume that any needle will fit your pen. If you are buying needles separately, check that they are suitable for your Mounjaro KwikPen before using them.
Your healthcare professional or pharmacist can also advise you on the needle length and gauge that may be suitable for you.
What Needle Size Does the Mounjaro Pen Use?
There is not one single needle size that everyone using Mounjaro must use.
The right needle depends on the type of compatible pen needle and your individual needs. Your doctor, pharmacist or nurse can advise you on the most appropriate option.
You may see pen needles sold in different lengths and gauges. A shorter or thinner needle is not automatically better for everyone, so it is best to follow the advice given by your healthcare professional.
The important point is to use a compatible pen needle and follow the instructions provided with your Mounjaro KwikPen.
Does Needle Length Affect Your Dose?
No. The dose of Mounjaro is set by the KwikPen. The needle is used to deliver the medicine under the skin.
However, you should use the type of needle recommended for your KwikPen and follow the injection instructions carefully. If you are unsure which needle to use, ask your pharmacist, doctor or nurse.
What Are Screw On Needles?
The Mounjaro KwikPen is used with screw on pen needles. Each needle should be new for every injection.
For each injection:
- Attach a new compatible needle.
- Prime the pen according to the Instructions for Use.
- Give your injection as instructed.
- Remove the needle after the injection.
- Dispose of the used needle in a suitable sharps container.
Do not store the KwikPen with the needle attached. The manufacturer advises removing the needle after each injection because leaving it attached can cause leaking, block the needle or allow air to enter the pen.
Can You Reuse Mounjaro Needles?
No. You should use a new pen needle for each injection.
A needle can become damaged or less suitable for use after an injection. Reusing it may also increase the chance of contamination, discomfort or problems with the needle.
The Mounjaro Instructions for Use advise removing the needle after each injection and disposing of it in a sharps container.
Why Single Use Needles Matter
Using a new needle for every injection helps you follow the manufacturer's instructions and good injection practice.
A used needle may:
- Become damaged after use.
- Feel less comfortable during a later injection.
- Become blocked.
- Increase the chance of contamination.
- Make it harder to give your injection correctly.
Do not share your pen or pen needles with another person. The Mounjaro KwikPen is intended for use by one person only, even if the needle is changed.
If you notice ongoing redness, swelling, pain or other changes at an injection site, speak to your doctor or pharmacist for advice.
What If My Mounjaro Needle Bends?
A pen needle can become bent or damaged if it is handled incorrectly or comes into contact with a hard surface.
If you notice that your needle is bent or damaged:
- Do not try to straighten it.
- Remove and dispose of the needle safely.
- Attach a new compatible needle.
- Follow the normal injection steps before giving your dose.
If you are unsure whether your pen or needle has been damaged, speak to your pharmacist, doctor or nurse before using it.
How to Attach a Mounjaro Pen Needle Safely
Before each injection:
- Wash your hands.
- Check your pen and the medicine inside it.
- Make sure you have the correct Mounjaro KwikPen.
- Attach a new compatible pen needle as shown in the Instructions for Use.
- Prime the pen as instructed.
- Give the injection under the skin as instructed.
- Remove the used needle immediately after the injection.
- Dispose of the needle in a sharps container.
- Replace the pen cap before storing the pen.
Mounjaro is given as a subcutaneous injection, which means it is injected under the skin. Follow the injection site and technique instructions provided by your healthcare professional and the Mounjaro Instructions for Use.
If you are unsure about how to use your pen or attach a needle, ask your pharmacist, doctor or nurse to show you how.
Comparison Table: Mounjaro Pen Needles
| Feature | Guidance |
|---|---|
| Needle supplied in pack | No |
| Needle type | Compatible screw on pen needle |
| Needle size | Ask your doctor, pharmacist or nurse which size is appropriate |
| Single use | Yes |
| Reuse | No |
| Store pen with needle attached | No |
| Dispose after use | Yes, in a sharps container |
Key Takeaways
- The Mounjaro KwikPen does not include pen needles in the pack.
- Use a compatible screw on pen needle recommended for your KwikPen.
- Use a new needle for every injection.
- Do not reuse, share or straighten a damaged needle.
- Remove the needle after every injection.
- Do not store the KwikPen with the needle attached.
- Dispose of used needles in a suitable sharps container.
What If I Run Out of Mounjaro Pen Needles?
Because the Mounjaro KwikPen does not come with needles, it is important to make sure you have enough before your next injection.
If you are running low:
- Contact the pharmacy or clinic that supplied your Mounjaro.
- Ask your pharmacist which compatible pen needles you can use.
- Make sure you have enough new needles for your upcoming injections.
- Do not reuse an old needle because you have run out of new ones.
If you do not have a suitable needle for your next dose, speak to your pharmacist or healthcare professional for advice rather than trying to improvise.
Travelling with Mounjaro Pen Needles
If you are travelling within the UK or abroad, remember to take enough Mounjaro and compatible pen needles for your trip.
A practical checklist includes:
- Your Mounjaro KwikPen
- Enough new pen needles
- A suitable sharps container or travel sharps container
- Your prescription or dispensing label if travelling internationally
- Any supporting medical documents you may need
- An insulated travel pouch if required for storing your medicine
If you are flying, it is generally useful to keep your medication and injection supplies in your hand luggage. Check the airline and destination country's requirements before travelling, as rules can vary.
Mounjaro Sharps Container
Used Mounjaro pen needles should be placed in a suitable sharps container immediately after use.
Sharps containers are designed to hold used needles and help reduce the risk of accidental needle stick injuries.
A suitable sharps container can help:
- Keep used needles away from children and other people.
- Reduce the risk of accidental injuries.
- Allow used needles to be disposed of through the appropriate waste service.
Do not put loose pen needles into household rubbish. Follow your local arrangements for getting rid of used sharps containers.
How to Dispose of Used Mounjaro Needles
After each injection:
- Carefully replace the outer needle shield.
- Unscrew the capped needle from the pen.
- Place the used needle into a sharps container immediately.
- Do not put loose needles into household waste.
- Replace the pen cap before storing the KwikPen.
The Mounjaro Instructions for Use specifically advise putting used pen needles into a sharps disposal container immediately after use.
What About the Empty Mounjaro KwikPen?
Each Mounjaro KwikPen contains 4 fixed doses, with one dose taken each week. After you have received all 4 doses, the pen should be discarded. The manufacturer also advises disposing of the pen 30 days after first use.
A small amount of medicine may remain in the pen after the four doses have been given. Do not try to use or extract the remaining medicine.
The KwikPen should not be refilled. Remove the needle before disposing of the pen and follow the disposal advice provided by your healthcare professional or local service.
Common Mistakes to Avoid
To help you use your Mounjaro KwikPen correctly, avoid these common mistakes:
- Reusing a pen needle.
- Sharing your pen or pen needles with another person.
- Storing the pen with a needle attached.
- Using a bent or damaged needle.
- Trying to straighten a bent needle.
- Using a needle that is not suitable for your KwikPen.
- Throwing loose needles into household waste.
- Trying to use medicine left in the pen after the four doses have been given.
- Continuing to use the pen after 4 doses or 30 days after first use.
- Using the pen without following the Instructions for Use.
If you are unsure about your needle, injection technique or how to dispose of your used pen and needles, your pharmacist, doctor or nurse can help.
