Pharmacokinetic Half-Life from Vd and CL

Calculate elimination half-life t_1/2 = (0.693 * Vd) / CL from volume of distribution and clearance, and predict dosing interval.

 
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Physical Constants Reference
ConstantSymbolValue
Speed of lightc2.99792458×10⁸
Planck's constanth6.62607015×10⁻³‴
Boltzmann constant1.380649×10⁻²³
Avogadro's numberNₐ6.02214076×10²³
Gravitational constantG6.6743×10⁻¹¹
Gas constantR8.31446
Elementary chargee1.602176634×10⁻¹⁹
Electron massmₑ9.1093837015×10⁻³¹
Proton massmₚ1.67262192369×10⁻²⁷
Fine-structure constantα7.2973525693×10⁻³
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How It Works

Calculate elimination half-life t_1/2 = (0.693 * Vd) / CL from volume of distribution and clearance, and predict dosing interval

Each component has a specific meaning:

  • Volume of distribution — The volume of distribution recorded for the patient or scenario being assessed.
  • Clearance — The clearance recorded for the patient or scenario being assessed.
  • Predict dosing interval — The predict dosing interval recorded for the patient or scenario being assessed.

Note: Interpret the pk half-life result against the clinical thresholds and context described above.

How to Use

Enter the volume of distribution, clearance, predict dosing interval for the patient or scenario you are assessing. Calculate elimination half-life t_1/2 = (0.693 * Vd) / CL from volume of distribution and clearance, and predict dosing interval. Use the pk half-life result to inform your clinical assessment.

Frequently Asked Questions