Question

the potency of a drug is quantified using the ______ of the drug.
$\mathrm{ec}_{50}$
$\mathrm{e}_{\max}$
$\mathrm{k}_\mathrm{d}$
$\mathrm{k}_\mathrm{i}$

Explanation:

Drug potency is often measured by \( EC_{50} \), which is the concentration of a drug that produces 50% of the maximum effect. \( E_{max} \) is the maximum effect, \( K_d \) relates to binding affinity, and \( K_i \) is for inhibitor potency. So \( EC_{50} \) is used for drug potency quantification.

Answer:

A. \( \text{EC}_{50} \)