GLP-1 Dose Plotter: Chart Your Medication Levels | MeAgain
GLP-1 Dose Plotter for Ozempic, Wegovy, Mounjaro & Zepbound
Log your semaglutide or tirzepatide shots and watch how they build up and taper between injections. Free, no signup, and every entry stays in your browser.
See how your recent doses may build and taper
Add recent semaglutide or tirzepatide shots to see a simple half-life estimate of how they may overlap between dose days.
Estimated semaglutide amount remaining
Which medication do you take?
Ozempic, Wegovy Semaglutide · about a 7-day half-life Mounjaro, Zepbound Tirzepatide · about a 5-day half-life
Stays in your browser. Never sent to MeAgain.
Calculated in this browser. Your entries are not added to the URL or sent to MeAgain.
Keep the medication pattern with your real week.
Log prescribed doses beside reminders, injection sites, symptoms, food, water, and weight.
Quick answer
Injectable semaglutide (Ozempic, Wegovy) has a half-life of about 1 week, and tirzepatide (Mounjaro, Zepbound) about 5 days. A dose is mostly out of your system after roughly five half-lives: about 5 weeks for semaglutide, about 25 days for tirzepatide. This free calculator turns the shots you log into that decay curve, right in your browser. It is an estimate, not a blood level or dosing advice.
The math is one transparent formula you can check yourself: each dose contributes dose × 0.5^(days since that shot ÷ half-life), and overlapping doses are added together. It does not model absorption or personal metabolism, and your entries never leave the browser tab.
Bottom line: Use the calculator for a quick private estimate. Use MeAgain when you want your injection history to live beside reminders, symptoms, nutrition, and weight over time.
Last updated July 14, 2026
Key takeaways
- The current FDA Wegovy label, revised February 2026, gives injectable semaglutide an elimination half-life of approximately 1 week.
- The FDA Zepbound label lists tirzepatide's half-life as approximately 5 days in one section and 5 to 6 days in another. This calculator uses 5 days, the lower of the two published values.
- Each entered dose contributes dose × 0.5^(elapsed days ÷ half-life), and the contributions from all past doses are added together.
- After five half-lives, roughly 97% of a dose is gone: about 5 weeks for semaglutide, about 25 days for tirzepatide.
- The result is an estimated amount remaining, not a blood concentration. It cannot account for absorption, metabolism, health conditions, or other medications.
- Your dates and doses stay in this browser tab. They are never added to a URL, sent to a server, or included in usage analytics.
How the GLP-1 Dose Plotter Works
The formula is simple on purpose
For every shot you log, the calculator works out dose × 0.5^(days since that shot ÷ half-life), then adds the results together. A 2 mg semaglutide shot is estimated at 1 mg remaining after 7 days. Log another 2 mg shot that day and the combined estimate is 3 mg at that moment: the fresh 2 mg plus the 1 mg still decaying.
That is a half-life decay model, not the full journey a medication takes through a body. Real pharmacology includes absorption over days, distribution, and elimination that differs from person to person. The line steps up on shot days because the model treats each dose as available immediately. Keeping the math this simple is a deliberate choice: you can verify every point on the curve with a calculator, and a simple model never pretends to know your personal response.
Bottom line: read the chart as the math of your dates and doses, never as a measured level in your blood.
Which half-life does the calculator use?
Two weekly injections are supported, each with the half-life from its current FDA label. For a single brand's view of the same math, open the Ozempic, Wegovy, Mounjaro, or Zepbound half-life calculator.
| Medication | Half-life used | What it means |
|---|---|---|
| Semaglutide injection | 7 days | The estimate halves every 7 days |
| Tirzepatide injection | 5 days | The estimate halves every 5 days |
How much of one dose is left over time
| Half-lives elapsed | Semaglutide (7-day) | Tirzepatide (5-day) | Estimated share of the dose left |
|---|---|---|---|
| 0 | Day 0 | Day 0 | 100% |
| 1 | Day 7 | Day 5 | 50% |
| 2 | Day 14 | Day 10 | 25% |
| 3 | Day 21 | Day 15 | 12.5% |
| 4 | Day 28 | Day 20 | 6.3% |
| 5 | Day 35 | Day 25 | 3.1% |
What this calculator does not calculate
- Actual blood, plasma, or serum concentration
- Absorption timing, bioavailability, distribution, or personal metabolism
- A safe dose, next dose, missed-dose action, split schedule, or dose-change plan
- Not-yet-approved or compounded medications, oral semaglutide, or research peptides
- Whether a symptom was caused by a medication level
The chart answers one question about dose timing. MeAgain adds the lived context around it: injections, reminders, symptoms, food, water, protein, fiber, weight, and progress over time.
GLP-1 Dose Plotter FAQs
How long does Ozempic stay in your system?
Ozempic and Wegovy both contain semaglutide, with an FDA-label half-life of about 1 week, so most of a dose clears in about 5 weeks. For the full timeline, dose-by-dose, see the Ozempic half-life calculator or Wegovy half-life calculator.
How long does Mounjaro or Zepbound stay in your system?
Mounjaro and Zepbound both contain tirzepatide, with an FDA-label half-life of about 5 days, so most of a dose clears in about 25 days. For the full timeline, dose-by-dose, see the Mounjaro half-life calculator or Zepbound half-life calculator.
How long until Ozempic or Wegovy is completely out of your system?
About 5 weeks for most of it. With a half-life of about 1 week, roughly 97% of a semaglutide dose is gone after five half-lives, and the FDA Wegovy label says semaglutide stays in circulation for about 5 to 7 weeks after the last 2.4 mg dose. Scrub this calculator's timeline forward to watch your own estimate fade toward zero.
How long until Mounjaro or Zepbound is out of your system?
Roughly 25 days for most of it. With a half-life of about 5 days, about 97% of a tirzepatide dose is gone after five half-lives, so the estimate sits near zero around 4 weeks after your last shot.
Does semaglutide or tirzepatide build up in your body?
Yes, by design. Weekly shots overlap: part of last week's dose is still present when the next one lands, so the level climbs across the first several weeks and then levels off. The FDA Zepbound label reports steady tirzepatide levels after about 4 weeks of once-weekly dosing. The calculator's chart shows that build-up from your own dates.
Can you get a GLP-1 out of your system faster?
No. There is no established way to flush semaglutide or tirzepatide out faster. Water, exercise, or fasting will not meaningfully change the elimination rate; the medication clears on its half-life schedule. If side effects are the concern, that conversation belongs with your prescriber.
What happens to the level when you stop a GLP-1?
The estimate fades on the half-life clock: for semaglutide, about half of the last dose's contribution is gone each week and roughly 97% after about 5 weeks; for tirzepatide, half every 5 days and roughly 97% after about 25 days. As the level falls, appetite commonly returns, and published follow-up studies report that regaining weight is common. The calculator shows the fade; what stopping means for you belongs with your prescriber.
Does MeAgain receive the dates and doses I enter?
No. The calculator runs in your browser tab. Your entries are never placed in the URL, sent to MeAgain's servers, or included in analytics.