Cavg

Cavg is the average concentration of a drug in the central circulation during a dosing interval in steady state. It is calculated by
 * $$C_{\text{avg}}=\frac{AUC_{\tau,\text{ss}}}{\tau}$$

where $$AUC_{\tau,\text{ss}}$$ is the area under the curve and $$\tau$$ the dosing interval.