Mounjaro Pen Update: Golden Dose

Each Mounjaro Pen is designed to provide four once-weekly doses, used as part of your regular dosing schedule.

There is also a small amount of additional liquid built into the pen. This is there to help prepare the pen before each injection, making sure it is working properly and that each dose is delivered as intended.

Sometimes, a small amount of liquid is left in the pen after use. This is sometimes called the “golden dose”. It’s not an extra dose and it isn’t meant to be used.

This can understandably cause confusion, with some people thinking they haven’t received their full dose or that something has been wasted. In reality, this small amount is part of how the pen is designed to work and does not affect your treatment.

To help reduce this misunderstanding, changes are being introduced to the pen design so that this is clearer for patients going forward.

No, there is no extra “golden dose” or “5th dose” in the Mounjaro pen.

Each pen is designed to deliver a specific number of doses, depending on your strength and treatment plan. Once those doses have been used, the pen is finished.

The small amount of liquid left in the pen after use can make it seem like there is more medicine left, but it is not a full, usable dose and should not be injected.

This leftover is simply part of how the pen is designed to work, and it does not mean anything has been missed or wasted.

The updated Mounjaro pen is being redesigned to make it clearer and easier to use.

The medicine itself is not changing – only the way the pen is built and how it functions internally.

Here’s what’s changing:

• Internal design update – refined to improve how it delivers the dose
• Clearer dosing – more obvious when a full dose has been given
• Less confusion about leftover liquid
• Improved consistency

These updates are designed to make the injection process simpler and more reassuring for patients using the pen.

No – these changes do not affect how you inject your Mounjaro pen.

The following remains the same:

• The injection steps
• Dose schedule
• How often you use the pen

The update is only to the pen’s internal design to make it easier to understand and reduce confusion, but your routine and technique will not need to change.

These updates are designed to make treatment simpler and more reassuring for patients. The update:

• Reduces confusion
• Improves confidence
• Makes use easier to understand
• Keeps the same treatment
• Supports better experience overall

Here are the key things to keep in mind when using the updated Mounjaro pen.

• The pen may look different – the updated design may not look exactly like the current pen you’re used to
• It still works the same way – your injection steps and dosing schedule do not change
• You may notice less visible liquid left over – the design has been updated to reduce confusion around any leftover medicine
• Check the packaging carefully – make sure you are using the correct strength and the updated version as supplied
• Read the updated Patient Information Leaflet – this will explain how the new pen works
• Ask if you’re unsure – your clinician can confirm you’re using the new pen correctly

The main changes you may notice with the updated pen:

• The plunger: sits in a clearer final position when your dose has been fully delivered
• Updated internal component: improves dose delivery and reduce uncertainty about what remains inside
• Visible “end of pen” indicator: a clearer visual signal shows when the pen has finished, helping confirm that no dose is left

The updated pen has been designed to make everyday use clearer and more straightforward.

• Clearer dose confirmation
• Less confusion about leftover liquid
• More consistent experience
• Easier to understand

Overall, the aim is to make the process feel more simple, predictable, and reassuring, while keeping your treatment the same.