Diagram XIX-1 Two Compartment Pharmacokinetic Model
Equation XIX-1 Differential Equation for the Central Compartment
The kel * X1 term describes elimination of the drug from the central compartment, while the k12 * X1 and k21 * X2 terms describe the distribution of drug between the central and peripheral compartments.
Thus,
Cp = A * e-
* t + B * e-
* t with
>
.
The A, B, , and
terms were derived from the microconstants
during the integration process. They are functions of the microconstant k12,
k21, kel and V1
+
= kel + k12 + k21
*
= kel * k21