GLP-1 dose level plotter
See an estimate of how much semaglutide or tirzepatide builds up in your body over weekly doses — the same idea as Holt’s medication-level chart.
Medication
Weekly dose
Weeks to plot
Estimated amount after 8 weeks: about 0.95 mg
Levels level off after roughly 5 weeks of steady weekly doses.
Runs in your browser. Nothing you enter is sent anywhere.
Good to know
The curve uses the half-life and time-to-peak from the FDA prescribing information (about 1 week for semaglutide, about 5 days for tirzepatide) in a simple pharmacokinetic model. It’s an illustration of how weekly doses build up, not a measurement.
Real levels vary from person to person. Never use this to change, skip or time a dose — that’s for your prescriber.