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Half-Life Calculator
How Much Is Still in My System?
Based on published pharmacokinetic data. Results are estimates — individual metabolism varies.
The most recent dose you took
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Still in System
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Days Since Last Dose
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Fully Cleared By
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Days Until Cleared
Clearance Timeline (5 Half-Lives)
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Reference
Half-Life Data by Medication
Based on FDA prescribing information and published pharmacokinetic studies.
| Medication | Half-Life | Time to Steady State | Time to Full Clearance |
|---|---|---|---|
| Semaglutide (all forms) | ~7 days | 4–5 weeks | ~5 weeks after stopping |
| Tirzepatide (all forms) | ~5 days | 4 weeks | ~4 weeks after stopping |
| Ozempic® / Wegovy® | ~7 days | 4–5 weeks | ~5 weeks after stopping |
| Mounjaro® / Zepbound® | ~5 days | 4 weeks | ~4 weeks after stopping |
⚠️ Half-life estimates are population averages. Individual clearance depends on kidney function, body weight, and metabolism. Always consult your provider before stopping or switching medications.
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Medical Disclaimer
This calculator provides estimates based on published pharmacokinetic data and is for educational purposes only. It does not constitute medical advice. Individual drug metabolism varies significantly. Always consult your prescribing provider before making any changes to your medication.