How this works
The math
How it works
percent left = 100 × 0.5 ^ (hours since dose ÷ half-life in hours)| Medicine | Label says | Used here |
|---|---|---|
| Semaglutide (Wegovy, Ozempic, Wegovy pill, Ozempic pill, Rybelsus) | About 1 week12 | 168 hours |
| Tirzepatide (Zepbound, Mounjaro) | About 5 days, or 5 to 6 days in people with overweight or obesity34 | 120 hours |
| Orforglipron (Foundayo) | About 29 to 49 hours5 | 39 hours |
The values used here are illustrative model choices: 120 hours uses the low end of the tirzepatide range, and 39 hours is the midpoint of 29 to 49 hours. Your body may clear a medicine faster or slower. The same constants power the medication level in the Onederland app.
Before you act on this
This is an estimate, not a lab test, and it can’t tell you when a medicine is gone. Don’t use it to time a dose.
Planning a pregnancy or surgery? Tell your prescriber and your surgical team what you take and when you last took it. The Wegovy label, for example, says to stop at least 2 months before a planned pregnancy.1
Always follow your doctor’s or prescriber’s advice and guidance. Talk to your prescriber before changing your dose.
For information only, not medical advice. Verify results with your healthcare provider; Onederland accepts no liability for use of these tools.
- Runs on this device. Nothing you type is sent anywhere.
- Every figure names its source, below.
- Education, not medical advice. Your prescriber comes first.
Sources
Sources
- Wegovy (semaglutide) injection and tablets, US prescribing information, revised 06/2026. accessdata.fda.gov
- Ozempic (semaglutide) injection, US prescribing information, revised 05/2026. accessdata.fda.gov
- Zepbound (tirzepatide) injection, US prescribing information, revised 08/2026. accessdata.fda.gov
- Mounjaro (tirzepatide) injection, US prescribing information, revised 08/2026. accessdata.fda.gov
- Foundayo (orforglipron) tablets, US prescribing information, revised 07/2026. dailymed.nlm.nih.gov
Label sources last checked on November 8, 2026. Onederland summarizes them; your prescriber and the full prescribing information come first.
