# Compounded tirzepatide: units on the syringe, vial life and what's still active > Compounded tirzepatide tracker: convert your vial's mg/mL and dose into insulin-syringe units, count doses per vial, keep the weekly shot day and see the 5-day half-life curve. Source: https://peppytracker.com/compounds/tirzepatide-compounded/ Last updated: 2026-08-30 Compounded tirzepatide is pharmacy-compounded tirzepatide drawn from a multi-dose vial with an insulin syringe, the same once-weekly GIP/GLP-1 agonist as Mounjaro and Zepbound, dosed in units per your provider. The Peppy catalog lists it as a vial dosed in units, weekly, half-life about 120 hours. Peppy converts mg to units for your vial's concentration and keeps the shot day. ## Tracking compounded tirzepatide: what matters A compounded tirzepatide tracker lives or dies on one number: the mg per mL on your vial. Tirzepatide doses are larger than semaglutide's, so concentrations are higher and the units climb fast. At 10 mg/mL, 2.5 mg is 25 units and 7.5 mg is 75 units; at 20 mg/mL those halve. Switch pharmacies or strengths and the same mg becomes a different line on the syringe. Peppy stores the vial's mg and mL on the protocol, prints the units on the card, the reminder and the Log shot sheet, and warns when a draw will not fit a 1 mL syringe. The [units guide](https://peppytracker.com/guides/compounded-semaglutide-tirzepatide-units/) walks through the common strengths. Most compounded vials are liquid, so you enter the label values as printed; if yours is a powder, enter the vial mg and the water you add. Then count the vial. At 5 mg a week a 10 mg/mL, 2 mL vial is four shots, and with step-ups every month the count changes. Inventory (Pro) counts doses left at the current dose, projects the run-out date and reminds you to reorder; see [vial inventory](https://peppytracker.com/guides/peptide-vial-inventory-tracker/). The molecule is the same as Mounjaro and Zepbound, with a label half-life of about 5 days. Peppy's "active in your system" curve uses the catalog's 120-hour figure as an estimate, and the daily check-in ties nausea, constipation and weight to each shot. ## Schedule and cycles The Peppy catalog lists compounded tirzepatide as weekly with no fixed dose ladder, because your provider sets the steps. Many people track rungs that mirror the branded labels' 2.5 mg increments; dose step-ups (Pro) take your provider's rungs in mg or units with a duration each, and the [titration tracker guide](https://peppytracker.com/guides/glp-1-titration-schedule-tracker/) shows the setup. Missed and overdue shots are computed from your weekday, never stored. The branded labels' 4-day missed-dose window is written for the pens; whether it applies to your compounded product is a question for your prescriber. ## How to do this in Peppy 1. Open **Protocols**, tap **+**, search "compounded tirzepatide". The catalog sets vial, units and weekly. 2. In the inline **Calculator**, type the vial's total mg and mL from the label, then your dose in mg. Peppy shows the units. 3. Pick the weekday and time. Enter your provider's rungs under **Dose step-ups** (Pro). 4. Add vials in **Inventory** (Pro) for the running-low alert. 5. On shot day, tap the countdown on **Today**, choose the suggested site on the body map, confirm the units and log. 6. Do the daily **check-in** and review **Progress** (Pro insights) for step-up markers on the weight trend. The [tirzepatide tracker page](https://peppytracker.com/trackers/tirzepatide-tracker/) covers branded and compounded together. ## Frequently asked ### How many units is 2.5 mg of compounded tirzepatide? It depends on the concentration on your vial. Example: at 10 mg per mL, 2.5 mg is 0.25 mL, or **25 units** on a U-100 insulin syringe; 5 mg is 50 units and 7.5 mg is 75 units. At 20 mg/mL every number halves. Enter your vial's mg and mL in Peppy's [calculator](https://peppytracker.com/calculator/) and verify with your prescriber. ### How often is compounded tirzepatide taken? The Peppy catalog lists it as weekly, like the branded tirzepatide pens. Set the weekday in Peppy and the countdown, reminder (Pro) and widget (Pro) follow it. ### What is the half-life of compounded tirzepatide? It is the same molecule as Mounjaro and Zepbound, whose labels report an elimination half-life of approximately 5 days. The Peppy catalog lists 120 hours and uses it for the "active in your system" estimate. ### What is the difference between a compounded tirzepatide tracker and a Mounjaro tracker? The molecule and the weekly rhythm are the same. The difference is units: a pen delivers a fixed mg, a vial needs a concentration to turn mg into syringe units, and vials run out mid-box. Peppy handles the conversion and the vial count; see the [units guide](https://peppytracker.com/guides/compounded-semaglutide-tirzepatide-units/). ### Where do you inject compounded tirzepatide? Most people log the abdomen, thighs or upper arms, the sites the branded labels list. Peppy's body map suggests the next one. See the [rotation guide](https://peppytracker.com/guides/injection-site-rotation/). ### How many units is 2.5 mg of Compounded Tirzepatide? It depends on how the vial was mixed. Example: a 10 mg vial plus 1 mL of bacteriostatic water is 10 mg/mL, so 2.5 mg is 0.25 mL, or **25 units** on a U-100 insulin syringe. Change the water and the units change. Use the calculator above with your own vial, and verify with your prescriber. ### How long does Compounded Tirzepatide stay in your system? The Peppy catalog lists a half-life of about 5 days for Compounded Tirzepatide. After roughly five half-lives, about 3.6 weeks, most of a single dose has cleared. That is an estimate from the half-life, not a measurement, and individual clearance varies. ### Can I track Compounded Tirzepatide in Peppy? Yes. Compounded Tirzepatide is one of 123 compounds built into Peppy, with its form, unit and typical frequency prefilled. Add it as a protocol, set your schedule, and Peppy handles the countdown, the log and the reminders (Pro). ### Where should I inject Compounded Tirzepatide? Follow your prescriber's instructions. For subcutaneous shots the GLP-1 labels list the abdomen, thigh and upper arm and say to rotate. Peppy's body map has 13 sites, suggests the next one, and shows when each was last used. Read the [site rotation guide](https://peppytracker.com/guides/injection-site-rotation/). --- Peppy is a tracking tool, not medical advice. Dose calculations are mathematical conversions only. Always follow your prescriber's instructions and verify every draw-up yourself. Peppy is a free iPhone app (Pro subscription optional). App Store: https://apps.apple.com/us/app/peptide-tracker-peppy/id6775005514