Pharmacodynamics

Exposure-Response

Published

May 5, 2025

“What the drug does to the body”

Table 1: Pharmacodynamic symbols
Symbol Description
E Effect
I Inhibition
EC50 Concentration for half of maximum effect
IC50 Concentration for half of maximum inhibition
Emax Theoretical max effect
Imax Theoretical max inhibition

Drug effect models

\[ \mathrm{E} = \frac{ \mathrm{E_max} \times \C^\gamma }{ \C^\gamma + \mathrm{EC}^\gamma_{50} } \]

\[ \mathrm{E} = \mathrm{E_0} - \mathrm{slope} \times t \]

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