IC50
IC50, the half maximal inhibitory concentration, represents the concentration of an inhibitor that is required for 50% inhibition of things like an enzyme, a cell, a cell receptor or a microorganism.
It's commonly used as a measure of drug effectiveness. Another measure of drug efficacy is EC50 which represents the concentration of a compound that is required to obtain 50% of the maximum effect. (Ex. EC100 would be the minimum concentration of a compound to obtain 100% of its effect).
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