Zepbound is tirzepatide, given as an injection once a week, and licensed for weight management. The same active ingredient is also sold as Mounjaro. If you have seen the name Zepbound in US-based content, check your own packaging and patient information leaflet, since the tirzepatide product available to you locally may carry a different brand name and different device details.

This matters for keeping count, because the number of doses in a device, and how the device itself is designed, can differ between products even though the active ingredient is the same. Do not assume the figures you see quoted for Zepbound online apply automatically to the tirzepatide product you have been prescribed; check your own leaflet and packaging instead.

Running out of a weekly injection unexpectedly is a practical problem, not just an inconvenient one. A simple log of when a pen or device was started and how many doses you have used can help you plan ahead for a repeat prescription or pharmacy collection well before supply becomes tight.

A simple way to log it

Consider keeping a running note with:

  • The date each new pen or device was started
  • The date of each dose used from that pen
  • The date you expect to need a replacement, based on your prescribed schedule
  • The date you actually requested or collected your next supply

This does not need to be complicated. A dated line in a notebook or tracking app each week is usually enough to build a reliable picture over time.

What to check in the patient information leaflet

The exact number of doses contained in your specific pen or device, along with storage conditions and how long a pen remains usable once in use, is set out in the patient information leaflet that comes with your medicine. Because packaging and device format can differ between products and countries, this page does not restate those figures. Your pharmacist can also confirm these details and help you time a repeat order.

It is worth reading this section of the leaflet once, carefully, and keeping a note of the key figures for your own reference: how many doses your device contains, and any time limits that apply once it is in use. Having this written down alongside your dose log means you do not need to search for the leaflet again every time you want to check where you stand.

If you use more than one injection device over time, for example after switching pharmacies or if your prescription changes, keep each pen or device as a separate entry in your log rather than continuing a single running count. This avoids confusion about which figures belong to which supply, particularly if you ever need to look back at exactly when a specific device was started.

Setting yourself a simple reminder point

Once you know roughly how many doses your pen contains and how often you use it, you can work out an approximate date by which you will need a new supply. Some people find it useful to set a reminder a week or two before that date, giving enough time to request a repeat prescription and collect it without the pressure of running out. This is a scheduling habit, not a medical decision, and it sits comfortably alongside the dose log described above.

Planning ahead, not working around gaps

If you notice your supply is running low, the right next step is to contact your prescriber or pharmacy in good time, not to look for ways to bridge a gap yourself. A clear log of doses used and pens started makes that conversation quicker, since you can show exactly where you are in your current supply rather than estimating from memory.

Why this small habit is worth keeping

A dose count log takes only a moment to update each week, but it removes a surprisingly common source of stress: realising at the last minute that a pen is nearly empty with no replacement in hand. Treating it as a routine part of your weekly injection log, rather than something separate to remember, makes it far more likely to stay up to date.