// multi-utility computation suite · offline · instant · precise
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│ computation suite │
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med.drug-protein-binding Calculator
Calculates the free (unbound) drug fraction in plasma from protein binding percentage and derives the effective half-life and steady-state concentration considering only unbound drug. Only unbound drug crosses membranes and exerts pharmacological effect — protein binding fundamentally determines dosing requirements.
Inputs
F Unbound Pct
Reference formula or conversion factor shown for context.
Dose Mg
Amount of medication administered per period. Most dosing is weight-based — verify with a licensed prescriber before clinical use.
Vd L Kg
Three-dimensional space occupied (m³ or L). 1 m³ = 1,000 L.
Cl L Hr Kg
Reference formula or conversion factor shown for context.
Bw Kg
Body or object weight. For health calculators, usually in kg or lbs.
Results
elimination half-life t½ (hr)
Time for half the radioactive material to decay. After 10 half-lives, less than 0.1% of the original material remains.
steady-state total Css (mg/L)
The combined total across all inputs and components.
steady-state free drug Css_free (mg/L)
The value at the specified point or condition.
free fraction fu
Sample size or count used in the calculation.
Vd (L)
Reference formula or conversion factor shown for context.