See your estimated GLP-1 level, week by week.
Choose your medication and dose. The graph shows the estimated amount active in your body after each dose, how it builds over the first weeks, and where it dips before the next one.
For education and arithmetic only. Not medical advice, and not a dosing, mixing or treatment recommendation. Confirm your medication, dose and measurements with your prescriber or pharmacist.
How it works
One dose
Each dose rises as it is absorbed and falls as it is cleared, at the rate set by the medication’s half-life.
Doses add up
The next dose arrives before the last one has gone, so the level builds for several weeks and then repeats the same pattern.
The model
A one-compartment model with first-order absorption, using published average half-life and bioavailability for each medication.
An estimate
Real levels vary from person to person. This is not a blood test and does not tell you to change anything.
Questions
Is this my real medication level?
No. It is an estimate from average pharmacokinetics. Nothing here measures your body.
Why does the level keep rising for the first weeks?
Because a weekly medication with a half-life close to a week is not fully cleared before the next dose. After about four to five half-lives the ups and downs settle into a steady pattern.
Does the app use the same model?
Yes. Steady draws your curve from the same constants, using the doses and dates you actually log.
How long does semaglutide stay in your system?
Its half-life is about a week, so most of a dose is cleared after about five weeks.
How long does tirzepatide stay in your system?
Its half-life is about 5 days, so most of a dose is cleared after about three to four weeks.
Does a GLP-1 build up in the body?
For the first few weeks, yes: each dose arrives before the last has cleared. Then the level settles into a repeating pattern.
What is a GLP-1 level graph?
A picture of the estimated amount of medication in your body over time, from your doses and the medication’s average pharmacokinetics.
Why is the oral semaglutide amount so small?
Because very little of a semaglutide tablet is absorbed (low bioavailability), which is why tablet doses are higher in mg.
Is Steady medical advice?
No. Steady records what you log and does arithmetic on it. It does not diagnose, prescribe or recommend a dose, and it is not a substitute for your prescriber or pharmacist.