How to Get the Last Dose of Mounjaro Out of the Pen

Mounjaro is supplied as a pre-filled KwikPen, and each pen contains a set number of doses depending on the strength and presentation prescribed to you. The last dose works in the same way as earlier ones — the pen is designed to deliver a full dose right up to the final injection — but there are a few things worth knowing.

The plunger may feel different near the end

As the pen approaches its last dose, some people notice the plunger requires slightly more consistent pressure. This is not a sign that the pen is faulty. Press slowly and steadily until the plunger stops moving, and hold the pen in place for a count of ten seconds (or as directed in your leaflet) before withdrawing the needle. Always check your leaflet for the exact hold time, as it may vary by pen presentation.

Check there is actually a dose remaining

Before attempting an injection, check the dose counter or indicator window on your pen. If the counter shows a remaining dose, you can proceed as normal. If you are unsure whether a full dose remains, your patient information leaflet (PIL) — and the electronic Medicines Compendium (eMC) entry for your specific pen — will tell you how to read the indicator correctly. It is worth checking the electronic Medicines Compendium (eMC) for the up-to-date patient leaflet for your exact pen.

Do not try to combine or transfer doses between pens

It can be tempting to try to top up a near-empty pen from another, but pens should never be combined or tampered with. Each pen is a single-use device designed to deliver its contents as supplied. Attempting to transfer medication between devices is unsafe and not something your prescriber or pharmacist would recommend.

If you have questions about how to read your specific pen or whether a dose is still available, the last dose of Mounjaro guide covers this in more detail. For questions about extracting a fifth dose from multi-dose pens, see the related page on getting the 5th dose out of a Mounjaro pen.

One of the most practical things you can do to avoid any confusion around your last dose is to keep an accurate log of every injection — and that is exactly what GLP Trackr is built for.

The app's dose logging feature lets you record each injection as you do it: the date, time, and dose strength. Over time this builds a clear picture of where you are in your pen and in your treatment schedule, so you are never left wondering whether you have already taken a dose or whether one remains. If you are approaching what might be your last dose, a quick look at your log tells you exactly where you stand — useful information to have before you inject, and equally useful to bring to your next appointment.

GLP Trackr also sends gentle dose reminders so a weekly injection does not slip your mind, which matters especially on the weeks when a pen change is due. You can also log when you start a new pen, keeping your records tidy from the first dose all the way through.

For a broader look at managing your Mounjaro doses and titration schedule, the Mounjaro dosing guide is a helpful starting point.

Always follow the instructions in your patient information leaflet and the guidance of your prescriber or doctor — they know your full medical history and can advise on anything specific to your pen or your dose. If you ever have doubt about whether a dose has been delivered correctly, contact your healthcare professional rather than attempting a second injection.

Keep every dose logged and your schedule on track — download GLP Trackr on the App Store or Google Play and try it free for 7 days.