You may have seen "3.75mg Mounjaro" mentioned online, including on pages that suggest it is in stock and ready to order. It is not a genuine Mounjaro strength. This guide explains the genuine Mounjaro doses and why you should not try to create a 3.75mg dose yourself from an existing pen.
Key Weight Loss Things to Know
- The genuine Mounjaro strengths are 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg, and 15mg. There is no 3.75mg pen.
- Mounjaro pens are fixed dose devices and are not designed for splitting or extracting a partial dose.
- Trying to extract a partial dose from a pen can lead to inaccurate dosing, contamination, or unreliable delivery.
- If your current dose does not feel right, speak to your prescriber rather than trying to change the dose yourself.
Why "3.75mg Mounjaro" Is Not a Real Product
Mounjaro (tirzepatide) is available in six strengths: 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg, and 15mg. These strengths increase in 2.5mg steps from the starting dose. Mounjaro is used for weight management in adults who meet the relevant criteria, and it is also used to help improve blood sugar control in people with type 2 diabetes. Tirzepatide acts on GLP 1 and GIP receptors, which can affect appetite and food intake. There is no genuine 3.75mg Mounjaro pen available as a licensed strength in the UK. If you see a page claiming to sell or stock "3.75mg Mounjaro", check the product details carefully because this does not match the recognised Mounjaro strengths.
You may also come across pages that mention "3.75mg Mounjaro" in their content or headings while only listing the six genuine strengths elsewhere on the page. This can be confusing if you are searching for a specific dose. Always check the actual product information and speak to a prescriber or pharmacist if you are unsure about a Mounjaro strength.
Why You Should Not Try to Get 3.75mg from a Mounjaro Pen Yourself
Mounjaro KwikPens are designed to provide four weekly doses. They are fixed dose injection devices and are not designed to be opened, measured, split, or used to extract a custom amount. Trying to do this can create several risks:
- You cannot reliably confirm how much medicine you are drawing out or giving yourself with each injection.
- The pen is not designed to be opened or accessed in this way, which may affect its sterility or function.
- An inaccurate dose, whether too much or too little, may affect your treatment and could increase the risk of side effects.
- There is no standard manufacturer guidance for using a Mounjaro pen to create a partial dose.
Each Mounjaro injection should be given using a new pen needle. Mounjaro pens are designed for use with compatible needles that meet the relevant device requirements.
This is a practical safety issue rather than simply a matter of being cautious. Mounjaro pens are designed to deliver specific doses. Trying to change how the pen delivers the medicine can make the amount you receive difficult to control and may increase the risk of dosing errors or other problems.
If You Think You Need a Different Dose
If your current strength does not feel right, especially if you are experiencing difficult side effects, speak to your prescriber. They can review how you are responding to treatment and decide whether a different licensed strength or a slower increase in dose may be appropriate.
Depending on your circumstances, your prescriber may advise staying at your current dose for longer, reducing the dose, or changing how quickly you increase your dose. This should be based on your individual treatment plan rather than trying to create a dose that is not available as a licensed strength.
Common side effects of Mounjaro can include nausea, vomiting, diarrhoea, and constipation. More serious side effects can occur, including pancreatitis and gallbladder problems. This is why any dose increase should be discussed with your prescriber.
There is a proper clinical route for adjusting your treatment. You do not need to try to change the amount in the pen yourself, whether your prescription came from a clinic, online pharmacy, or telemedicine service.
The Genuine Mounjaro Strengths
| Strength | Price with FIRST40 |
|---|---|
| 2.5mg | £129.99 |
| 5mg | £159.99 |
| 7.5mg | £209.99 |
| 10mg | £229.99 |
| 12.5mg | £259.99 |
| 15mg | £278.99 |
These are the genuine Mounjaro strengths listed above. Your prescriber can confirm which strength is appropriate for you at each stage of treatment.
If you have questions about your current dose or want to discuss adjusting it, start your free consultation and raise your questions with your prescriber directly.
Medical Disclaimer
This page provides general information about Mounjaro strengths. It is not a substitute for personalised medical advice, diagnosis, or treatment.
Mounjaro pens should normally be stored in the refrigerator at 2°C to 8°C. They may be kept unrefrigerated for up to 30 days under the appropriate storage conditions. Keep the pen in its original carton where possible and follow the storage instructions supplied with your medicine.
Never attempt to split, measure, or extract a partial dose from a Mounjaro pen. If you have concerns about your current dose or side effects, speak to your prescriber, pharmacist, or GP rather than changing your treatment yourself.
Do not use a pen after the expiry date. Check the pen label and the medicine before use, and follow the instructions provided with your prescription.
