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<p><b>Biological half-life</b> (<b>elimination half-life</b>, <b>pharmacological half-life</b>) is the time taken for the concentration of a <a href="page.php?w=drug">biological substance</a>, such as a <a href="page.php?w=medication">medication</a>, to decrease from its maximum initial <a href="page.php?w=concentration_%28chemistry%29">concentration</a> (<a href="page.php?w=Cmax_%28pharmacology%29">C<sub>max</sub></a>) to the half of C<sub>max</sub> in the <a href="page.php?w=blood_plasma">blood plasma</a>. It is denoted by the abbreviation <b><i>'.</i></b></p><p>
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