Drug Washout Calculator — Half-Lives to Clearance

Calculate time required to reach any desired residual drug concentration or functional washout (>95%, >99%, >99.9%) after discontinuation based on the drug's elimination half-life.

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Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Calculate time required to reach any desired residual drug concentration or functional washout (>95%, >99%, >99.9%) after discontinuation based on the drug's elimination half-life

Each component has a specific meaning:

  • Drug's elimination half-life — The drug's elimination half-life recorded for the scenario being assessed.

Note: Interpret the drug washout time result against the thresholds and context described above.

How to Use

Enter the drug's elimination half-life for the scenario you are assessing. Calculate time required to reach any desired residual drug concentration or functional washout (>95%, >99%, >99.9%) after discontinuation based on the drug's elimination half-life. Use the drug washout time result to inform your calculation.

Frequently Asked Questions