GLP-1 half-life visualizer
Pick a medication and a scenario to see the modeled level build toward steady state, dip when a dose is missed, or fade after the last one. Built from each label's published half-life and time to peak, with the modeling shown in the open. Nothing is stored, and no account is needed.
Modeled from the elimination half-life and time to peak in each brand's FDA prescribing information. Real levels vary from person to person. This shows the shape, not your blood level.
What a half-life means here
A half-life is how long it takes the body to clear half of what is circulating. A medicine with a long half-life fades slowly, so repeated doses stack: each new dose lands on what is left of the previous ones, and after several half-lives the ups and downs settle into a steady rhythm. That is why the weekly GLP-1 medicines take weeks to reach steady state, and why levels linger for weeks after the last dose.
| Molecule | Brands | Half-life | Steady state, per the label |
|---|---|---|---|
| semaglutide | Ozempic, Wegovy | 7 days | 4 to 5 weeks |
| tirzepatide | Mounjaro, Zepbound | 5 days | about 4 weeks |
| liraglutide | Saxenda | 13 hours | 2 to 3 days |
By medication
Where the numbers come from
Two label facts per molecule drive everything on this page: the elimination half-life and the time to peak, both from the FDA prescribing information. The curve is a standard one-compartment model built only from those two numbers and the dosing schedule, shown as a percent of the steady peak precisely because an absolute blood level cannot be derived from public data. See how we calculate.
- semaglutide: Ozempic and Wegovy FDA prescribing information (semaglutide)
- tirzepatide: Mounjaro and Zepbound FDA prescribing information (tirzepatide)
- liraglutide: Saxenda FDA prescribing information (liraglutide)
The curve is an average. Your weeks are not.
This page models how levels build and clear on the label’s average figures. What actually happened after your last step up — the glucose, the weight, the days that were rough — only exists if something wrote it down against the dose that was in force. That is one chart, and logging it is free.
Wondering about weight instead?
The GLP-1 weight loss calculator projects the published trial curves onto your start weight, and GLP-1 dosing and titration explained covers why doses step up slowly.
General information, not medical advice. This page models an average curve from label averages; it is not your blood level, and it never tells you when to take a dose. Missed-dose instructions live in your brand's prescribing information and with your pharmacist or prescriber.
Track your real doses and titration
This page models an average pharmacokinetic curve. SteadyRange tracks your real injection days, titration step-ups, and weekly weight and fasting glucose on one timeline—ready for your next prescriber appointment.