How Many Doses Are in a Mounjaro Pen?

Mounjaro (tirzepatide) is a once-weekly injectable medicine. Each pre-filled pen is supplied at a specific dose strength and contains 4 individual doses — one injection per week for four weeks. Once all four doses have been used, the pen is empty and should be disposed of safely in line with local guidance.

Dose strengths available

Mounjaro pens are available in several strengths — commonly 2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, and 15 mg. Each pen, regardless of strength, contains those same 4 doses. Your prescriber decides which strength is right for you at any given stage of your treatment; the number of doses per pen stays the same across the range. For full product details, the electronic Medicines Compendium (eMC) holds the official prescribing information and patient leaflet.

Keeping count across your treatment

Because titration typically involves moving through increasing strengths over time — always under prescriber direction — you may go through several different pen strengths during your journey. Each new strength comes in its own pen, again with 4 doses inside. Staying on top of which dose number you are on, and which strength you are currently using, is where a clear record becomes genuinely useful.

If you are also curious about how other GLP-1 pens compare, see how many doses are in a Wegovy pen for a factual overview of that medicine's supply format.

For more detail on the 5 mg pen specifically, the Mounjaro 5 mg guide covers what to expect at that strength.

Knowing there are 4 doses in a pen is useful — but keeping a running log of every injection you take is what turns that knowledge into real confidence. GLP Trackr's dose logging feature lets you record each injection as you go: the date, the dose strength, and which number in the pen you are on. Over time, that creates a clear, timestamped history of your entire treatment so you always know exactly where you are.

The app also sends dose reminders, so a weekly injection is never forgotten mid-pen. And if you ever need to note a missed dose or an unusual experience, you can log that too — building a record that is easy to share with your prescriber at your next appointment. Related reading: Mounjaro pen doses explained and a closer look at how many doses per Mounjaro pen.

Any questions about your dose schedule, when to move to the next strength, or what to do if a dose is missed should always go to your prescriber or doctor — those decisions belong with them, not an app. GLP Trackr records your journey; your healthcare professional guides it.

Ready to keep a clear record of every dose? Download GLP Trackr on the App Store or Google Play and explore it free for 7 days — no commitment needed.