Tirzepatide tracker app: one record, whatever name is on the box
Short answer: PepLevel is a tirzepatide tracker app for iPhone, coming soon to the App Store. It works on the generic name, so it fits Mounjaro, Zepbound or a compounded vial alike: log each weekly dose, see the planned dose as a volume in mL for a vial, track what is left and watch an estimated level curve built on tirzepatide's half-life of about 5 days. The free version tracks one medication.
One medicine, several names
Tirzepatide is sold as Mounjaro in the UK and as Mounjaro or Zepbound in the US. In the US some people also use compounded tirzepatide from a vial. Plenty of people move between these over a year, because of price, supply or a change of provider. An app built around one brand's pen then stops fitting halfway through the story.
Tracking by the generic name keeps the history in one line. A switch from a pen to a vial is a change of container, not a new medicine, and the record should read that way.
Why vials need more tracking than pens
A pen shows the dose on its own dial or delivers it in one press. A vial asks more of you. You draw the dose up with a syringe, so the number that matters in your hand is a volume, not milligrams. The US Zepbound label, for its own vials, tells people to use a syringe that can measure the dose volume and a new syringe and needle every time.
Compounded vials vary more. Some arrive as a ready-mixed liquid. Others need water added before use, which sets how much liquid carries each milligram. Either way, the strength of your vial is whatever your prescriber and pharmacy say it is, and it may differ from the last one.
The FDA says compounded drugs are not FDA approved, so they are not reviewed for safety, effectiveness or quality before sale. It has also received reports of people measuring and injecting the wrong amount. Its advice for multi-dose vials is to throw them away 28 days after first use, even if some is left. If a volume ever looks wrong for your dose, stop and check with your pharmacist or prescriber.
What the best tirzepatide tracker app should handle
- Any presentation. Pen, single-dose vial, multi-dose vial or a vial you mixed yourself.
- Volume beside the dose. Your planned dose in mL, worked out only from your vial's own figures.
- Supply that counts down. Milligrams and liquid left, and a warning before the vial runs dry.
- Your titration plan. The steps your prescriber set, never ones the app invents.
- Sites, weight and side effects on the same timeline as your doses.
- A level estimate that reflects late, skipped and changed doses.
The level curve and the 5-day half-life
The Zepbound label gives tirzepatide a half-life of about 5 days. With a weekly dose, each shot arrives before the last one has fully cleared, so levels build over the first weeks and then rise and fall in a steady weekly wave. A late dose, a missed week or a switch in container shows up as a change in that wave. An estimated level curve built from your own logged doses makes that easier to picture. It is an illustration from published averages, never a blood test.
How PepLevel handles it
Add tirzepatide from the compound library, pick your weekly day and enter your prescriber's titration plan. Today shows the current step and a countdown, with the step carried into each reminder.
Then save each container as it really is. For a pen, choose the dose control it uses. For a vial, choose pre-mixed and enter the liquid volume, or choose needs mixing and enter the water you added, plus the amount and an expiry date. PepLevel then shows your planned dose as a volume next to the milligrams on Meds, Today and Log Dose. It converts the dose already in your plan from your vial's own figures. It never suggests, calculates or adjusts a dose.
Each logged dose comes off that vial, so the supply overview shows milligrams and liquid left, and a reorder reminder arrives 14 days ahead by default. The level curve uses tirzepatide's published half-life and your actual logged doses, with 7, 30 and 90 day views, a marker for now and a caption saying it is an illustrative estimate.
Switching from a pen to a vial keeps one history. The free version tracks one medication. Pro adds more for £5.99 a month, £24.99 a year with a 7-day free trial, or £69.99 lifetime. There is no account and your data stays on your iPhone.
Common questions
Is there a free tirzepatide tracker app?
PepLevel's free version tracks one medication, which covers a single tirzepatide plan with dose logging, reminders, supply, sites, weight, side effects and the level curve. It is coming soon to the App Store for iPhone.
Can I track compounded tirzepatide in PepLevel?
Yes. Save the vial with its amount and either its liquid volume or the water you added, and the app shows the planned dose from your plan as mL. Check any volume that looks wrong with your pharmacist.
How long does tirzepatide stay in your system?
The Zepbound label gives a half-life of about 5 days, so levels fall by roughly half every 5 days after a dose. PepLevel's level curve is an estimate from that average and your logged doses, not a measurement.
Tirzepatide, under any name
Pens or vials, planned doses in mL and an estimated level curve. Coming soon to the App Store. Coming soon to the App Store.
Get PepLevelMedical disclaimer: this guide is general information, not medical advice. PepLevel does not sell, source or recommend any medicine and never works out a dose. Half-life and vial guidance are summarised from the US Zepbound label and FDA statements at the time of writing. Always follow your prescriber's instructions, and ask them, your pharmacist or NHS 111 if you are unsure about anything. PepLevel is a logging and reminder tool only.