TRT injection tracker: schedules, sites and vials, alongside a GLP-1
Short answer: Testosterone injections are often split into smaller, more frequent doses, such as twice a week or every 3.5 days, which makes it easy to lose track of which day is next and which side you used. A good TRT log records the date, time, amount, site and vial for every injection, rotates between intramuscular or subcutaneous sites, and warns you before the vial runs out. If you also take a GLP-1, each needs its own schedule and site history.
Why TRT is harder to track than a weekly jab
Many people on testosterone replacement inject more than once a week. Splitting a weekly amount into two injections is common, and so is a gap of 3.5 days, which means the injection time alternates between morning and evening. Some inject smaller amounts under the skin every day or two. Whatever your clinician has set, it adds up to more injections to remember, more sites to rotate and more chances to lose count.
Common schedule types
| Schedule | What it looks like | What trips people up |
|---|---|---|
| Weekly | One injection on the same day each week | Few problems, but a long gap if one is missed |
| Set weekdays | Monday and Thursday, for example | Gaps are uneven, 3 days then 4 |
| Every 3.5 days | Every 84 hours, such as Monday morning then Thursday evening | Calendar apps cannot express it, and the time keeps flipping |
| Every N days | Every 2 or 3 days | It drifts through the week, so fixed-day reminders are wrong |
Site rotation for intramuscular and sub-Q injections
Intramuscular (IM) testosterone usually goes into large muscles, such as the glutes (the ventrogluteal site on the side of the hip is often preferred), the outer thigh or the deltoid in the shoulder. Subcutaneous (sub-Q) injections go into the fat of the abdomen, thigh or back of the arm, like a GLP-1. Rotating sites and sides gives tissue time to recover and can reduce soreness and scar tissue. Your clinic will tell you which sites and needle suit you.
If you inject twice a week, a simple left, right, left, right pattern across two sites already spaces each spot a week apart.
Vials and supply
Testosterone often comes in multi-dose vials, and running out between prescriptions is a real risk when a clinic appointment or blood test is needed first. It helps to know the date the vial was opened, how much is left after each injection and roughly when it will run out at your current schedule.
Blood tests and reviews
Your clinician may want blood taken at a particular point between injections. A dated record of your last injection answers "when was your last dose?" precisely, and makes results easier to interpret.
TRT alongside a GLP-1
A growing number of people take testosterone and a GLP-1 such as Mounjaro or Wegovy. They run on different schedules, go into different sites and come from different containers. Keeping them in one app only works if that app treats each as its own medication rather than squeezing them into one routine.
How PepLevel handles it
Add testosterone from PepLevel's compound library, or as a custom compound, and pick the schedule your clinician gave you: weekly, set weekdays, every N days, or every N hours for true elapsed intervals like 84 hours, where the time alternates between morning and evening automatically.
Choose intramuscular or subcutaneous, and the site grid shows the matching zones. For IM that means the ventrogluteal (hip), deltoid, glute and thigh sites, and an IM deltoid is never confused with a sub-Q back-of-arm, so the history stays accurate. Each dose saves its site, recent zones are dimmed, and the next one is marked.
Save your vial with its volume and opened date, and the app shows each planned dose as mL, tracks what is left and reminds you ahead of running out. Add your GLP-1 as a second medication (Pro) and each keeps its own schedule, reminders, level curve and site history, shown together in the week view on Today. The app never suggests a dose. It follows the plan you enter.
Common questions
How do I track TRT injections every 3.5 days?
Use a schedule based on hours rather than days: 84 hours between injections. PepLevel's every N hours option handles this, so reminders alternate between morning and evening correctly.
Where should I inject testosterone?
That depends on whether your injections are intramuscular or subcutaneous and what your clinic advises. Common IM sites are the glutes, ventrogluteal area, outer thigh and deltoid. Rotate sites and sides as your clinician recommends.
Can I track TRT and Mounjaro in the same app?
Yes, as long as the app treats them as separate medications. PepLevel gives each its own schedule, reminders, site history and supply, and shows both in one week view.
TRT and your GLP-1, kept apart properly
Hour-based schedules, IM site rotation and vial tracking. Coming soon to the App Store.
Get PepLevelMedical disclaimer: this guide is general information, not medical advice. Testosterone should only be used under the care of a clinician who monitors your blood tests. 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.