Every drug rises, peaks, and clears. See the concentration curve form, and how half-life and dose keep it inside the therapeutic window.
PharmacokineticsLive
how a drug rises and clears
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After a dose, drug concentration rises as it absorbs, then falls exponentially as the body clears it. The half-life sets the decline; the goal is to stay inside the therapeutic window — high enough to work, low enough to be safe. Educational tool, not medical advice.
Reading this result: Absorption (ka 1.2/h) is much faster than elimination, so the drug reaches its peak quickly (about 1.9 h) and the curve then tracks the 4-hour half-life on the way down.
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How it works
A one-compartment model tracks plasma concentration as a drug absorbs and is eliminated. The half-life sets the exponential decline; dosing aims to keep levels above the minimum effective concentration but below the toxic threshold. Educational tool, not medical advice.
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Is this pharmacokinetics simulator tool really free?▾
Yes. Pharmacokinetics runs entirely in your browser using your device's own compute, so local use is free forever. You only pay Compute Tokens if you scale a job to the cloud.
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No. Everything runs client-side in a modern browser — no downloads, no license, no account required to start.
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The solver uses established numerical methods, but results are for research and educational purposes and should be validated against experiment or professional review before you rely on them.