The Mounjaro Pen – How to Use
Considering the Mounjaro Pen for your weight-loss journey but not sure where to begin, what to do, or what’s included? You’re in the right place!
The Mounjaro Pen is a weight-loss tool designed to suppress appetite and help you feel full faster. Containing tirzepatide, Mounjaro mimics the GLP-1 and GIP hormones in the body, which are usually released after eating to signal fullness. When used alongside healthy eating habits and lifestyle changes, Mounjaro has proven to be one of the most effective weight-loss solutions on the market.
Who Can Use It?
Originally developed to help manage diabetes, Mounjaro has since become a weight-loss option for individuals with a BMI of 30 or higher, or for weight-loss maintenance. It is approved for use in adults over 18, with caution advised for older adults – especially those with additional health conditions.
Since everyone’s weight-loss journey is unique, it is essential to disclose any health conditions, medications, or any other concerns when discussing this injection with your healthcare provider. It should not be used if you are pregnant, trying to conceive, or breastfeeding.
How to Use your Mounjaro Pen
This once-weekly injection is supplied in a pen that provides four doses (four weeks) at a single strength. All weight-loss journeys begin with the lowest dose, which can be gradually increased to the most effective strength to manage appetite suppression, weight loss, and side effects. An important factor about Mounjaro is that you don’t have to increase your dose if the lower strength is effective for you. Many people find even the lower strengths effective.
However, if you decide to increase the dose, it should be done gradually, with at least four weeks on each strength before moving up.

The maximum dose available for the Mounjaro pen is 15mg, injected once a week.
Mounjaro should be injected on the same day each week. Choose a day that works for you and best fits your schedule. If you miss a dose, don’t worry – if it’s within four days of your scheduled time, use it as soon as you remember, then continue as normal on your next scheduled day. If it’s been more than four days, skip the dose and inject as normal on your next scheduled day. Never double dose.
Choosing Your Injection Site

How to Store the Mounjaro Pen
- Keep out of reach of children.
- Do not use after the expiration date, stated on both the box and the pen label (this refers to the last day of the month).
- Store in the fridge between 2oc and 8o . Do not freeze.
- Once opened, the pen can be kept at room temperature (below 30oc) for up to 30 days.
- Do not store with needles attached. Always replace the cap securely.
- After use, dispose of the pen by taking it to a pharmacy or by contacting your local council to arrange safe disposal.
What You’ll Need and What’s Included in the Box
When using your Mounjaro you’ll need:
- your Mounjaro Pen (containing four doses, enough for four weeks)
- alcohol swabs
- needles
- sharps bin
Please note: The pen does not come with needles in the box. These will need to be purchased separately from your local pharmacy or directly from us.
Your Mounjaro Pen will be delivered within a cold pack (within 2oC and 8oC). An ice pack will be included alongside your pen in a temperature-controlled pouch to ensure that the pen remains safe to use upon arrival.
The Bottom Line
Mounjaro is an effective tool to support your weight-loss journey by providing a manageable way to control your appetite when paired with a healthy lifestyle. As with any medication, it’s essential to follow your healthcare provider’s guidance and to understand how to use the pen before starting. Mounjaro can help with your weight-journey, but you are in control of the direction of travel by following dietary and lifestyle measures to make lasting change.
If you’re ready to take the next step in your weight-loss journey, Mounjaro might be the right choice for you.