Medication Level Estimator
See how your weekly GLP-1 medication level rises and falls, based on half-life data from the FDA prescribing information.
For once-weekly injections.
Count the injections since your dose last changed, including your most recent one.
Track every dose in the Nudge app
Log your shots, see your medication level, and follow every phase of your GLP-1 journey in one calm place.
How it works
How we model your medication level
A standard pharmacology model using the half-life and time-to-peak published in each medication’s FDA prescribing information.
Sources: Wegovy (semaglutide) and Ozempic Prescribing Information, Novo Nordisk, §12.3; Zepbound (tirzepatide) and Mounjaro Prescribing Information, Eli Lilly, §12.3. Absorption rate estimated from the label time-to-peak and half-life. Illustrative model, not measured drug levels.
1
Absorption after each injection
After a weekly injection, the level rises to a peak in about 1–3 days for semaglutide and about 1 day for tirzepatide.
2
Gradual clearance
Your body clears about half the medication every ~7 days (semaglutide) or ~5 days (tirzepatide), so each dose overlaps the last.
3
Building to steady state
With weekly doses, levels build up and level off after about 4–5 weeks. We show your level as a % of that steady-state peak.
Tips
Understanding your weekly cycle
Levels rise and fall
It’s normal for the level to be highest a day or two after your injection and lowest before the next one.
Dose changes reset the build-up
When your dose increases, it takes a few weeks for levels to settle at the new steady state.
Everyone responds differently
Appetite and side effects don’t always follow the curve exactly.
Missed a dose?
Follow your medication guide or ask your pharmacist. Don’t use this chart to decide.
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