What Does 3.75 Clicks Mean on a Mounjaro Pen?

Mounjaro (tirzepatide) is a once-weekly injectable medicine supplied as a pre-filled pen. Different pen formats may use slightly different dosing mechanisms — some display the dose strength clearly on the dial, while others use a numbered click system where each click represents an incremental amount of the medicine.

When a pen uses a click system, each full click advances the dose selector by a set increment. A setting of 3.75 clicks would therefore represent a mid-point position between whole-number click counts, which some pen variants allow. The exact volume and dose strength that corresponds to any click count depends on the specific pen device and the concentration of medicine in the cartridge.

Why the click count matters

Using the wrong number of clicks could mean receiving too little or too much of the medicine — both of which are clinically significant. That is why dose setup should always follow the instructions in the Patient Information Leaflet (PIL) that comes with your pen, and any questions about how many clicks to use should go directly to your prescriber or pharmacist.

For a broader overview of how Mounjaro is used and what to expect on the pen, see our Mounjaro information hub. If you want to understand how click counts translate to doses more generally, our page on the 3.75 mg Mounjaro dose covers the dose stage in more detail, and our Mounjaro clicks guide explains the click system across different dose positions.

Always check your PIL first

Pen designs can vary between manufacturing batches and markets. Rather than relying on a general guide, always cross-reference the leaflet that came with your specific pen. If anything is unclear, your dispensing pharmacist can walk you through the dial mechanism before your next injection.

Keeping an accurate record of your dose at each injection is one of the most practical things you can do on a weekly injectable schedule — and GLP Trackr's dose logging feature is built exactly for this. Each time you inject, you can record the dose strength (or click count) alongside the date, time, and injection site, so you always have a clear, searchable log of every shot.

This matters more than it might seem. On a weekly schedule it is easy to lose track of whether a dose was taken, at what setting, or whether a site was rotated correctly. Having a timestamped record also gives you something concrete to bring to your next prescriber appointment — useful if you want to discuss how a particular dose stage has felt, or if you need to check your injection history.

Beyond dose logging, GLP Trackr's injection-site rotation tracker suggests your next site based on your previous entries, helping you avoid overusing any one area. You can also use the side-effect log to note anything you noticed around injection day — handy if you want to spot patterns over time and discuss them with your prescriber.

For a comparison of how click counts map across different dose levels, take a look at our Mounjaro clicks chart.

If any aspect of your pen's click mechanism is causing concern — such as uncertainty about the correct setting or a pen that does not click as expected — contact your prescriber or pharmacist promptly rather than guessing. GLP Trackr helps you track your journey; it is not a substitute for clinical guidance on how to use your device.

Ready to keep your weekly doses organised in one place? GLP Trackr is free to try for 7 days — available now on the App Store and Google Play.