Your week has a shape. Now you can see it.
Hungry Sundays. Queasy Tuesdays. Your week on a GLP-1 has a rhythm — driven by a rising-then-fading medication level. ShotLock models that curve from your real shot history and explains it, phase by phase.
A real curve, built from your real shots
Each dose is modeled with your medication's published absorption and half-life, then summed over your actual shot history — including late shots and dose changes. The result: an honest estimate of what's active in your body right now.
Phases that explain how you feel
ShotLock divides your cycle into phases — absorption, peak, steady, fading — and tells you what each typically feels like, with side-effect patterns drawn from published trial data. The 'why do I feel off today?' question finally has context.
Your side effects, mapped to your cycle
Log symptoms in the daily check-in and ShotLock shows how they cluster across your cycle, and how your frequency compares with what trial participants reported. Patterns you can actually discuss at your next appointment.
Frequently asked questions
Is the level a measurement?
No — it's a model-based estimate using published pharmacokinetic parameters applied to your logged shots. Only a blood test measures actual concentration. The estimate is for understanding your routine, not for dosing decisions.
Which medications have level estimates?
Semaglutide (Ozempic, Wegovy, compounded) and tirzepatide (Mounjaro, Zepbound, compounded), with chart support for retatrutide based on published estimates.
What happens if I log a shot late?
The model uses your actual injection times, so a late shot shows up as a deeper trough and a shifted peak — exactly what your body experiences.
Your next shot is the one that matters.
Download ShotLock free, log your first shot in under a minute, and let your phone work for your routine instead of against it.