Can You Get a 5th Dose From a Mounjaro or Wegovy Pen?

Mounjaro (tirzepatide) and Wegovy (semaglutide) are both supplied as pre-filled, single-use injectable pens. Each pen is calibrated by the manufacturer to deliver a set number of doses at a fixed volume. The number of doses per pen varies by the specific product configuration — check the patient information leaflet that came with your pen, or the product entry on the electronic Medicines Compendium (eMC), for the exact number of doses your particular pen contains.

Why apparent leftover liquid is not the same as an extra dose

Pre-filled pens are engineered with a small amount of overfill — this is a standard pharmaceutical manufacturing practice to ensure every intended dose is fully delivered, not to provide an additional dose. Liquid remaining after the labelled number of doses may not represent a complete or accurately measured amount of medicine. Attempting to draw or inject that residual volume could mean receiving an under-dose, a mis-timed dose, or using a pen in a way it was not validated for.

What about a 5th dose specifically?

Whether a particular pen configuration yields a 5th dose is a question that comes up regularly in the GLP-1 community. There is detailed discussion of the practical side of this in our guide on getting a 5th dose from a Mounjaro pen and in the related page covering Mounjaro 5th dose considerations. The consistent message across all of this is the same: dose decisions — including whether to attempt an additional injection from a pen — belong with your prescriber, not with what you can see in the pen window.

For context on how pens are handled more broadly, our page on extra doses from a Mounjaro pen covers what users commonly ask and why clinical guidance should always be the starting point.

Keeping an accurate record of every injection is one of the most practical things you can do to manage your treatment consistently — and it is exactly what GLP Trackr is built for. The app's dose logging feature lets you record each injection as it happens: the date, time, and dose strength, so you always have a clear, timestamped history of where you are in your schedule.

This matters more than it might seem. If you are unsure whether you have taken a dose, or you want to bring a clear picture of your injection history to your next prescriber appointment, having that log already built removes the guesswork. The app also includes dose reminders, so your weekly injection stays on schedule without relying on memory alone.

If a dose is missed or you have a question about your pen, logging it in GLP Trackr gives you something concrete to discuss with your prescriber — the app records it; your prescriber advises on it. You can explore how the 5mg pen fits into the broader titration picture on our Mounjaro 5mg dose guide.

Any decision about your dose — including whether to attempt an additional injection from a pen — should always be made with your prescriber, never on your own. If you have concerns about your pen or your supply, contact your healthcare professional or the pharmacy that dispensed your medication.

GLP Trackr is free to try for 7 days — download it on the App Store or Google Play and start building your injection log today.