Question

In plasma drug concentration versus time graph as shown in the picture, what should be the correct option for the marked place?

(a) Elimination phase

(b) Post absorption phase

(c) Absorption phase

(d) Duration of action

The question was asked during an interview.

This intriguing question comes from Pharmacokinetic topic in portion Pharmacokinetic Drug Interactions & Basic Considerations of Drug Biotechnology

Answer 1

The correct option is (a) Elimination phase

For explanation I would say: The section of the curve to the right of peak represents the elimination phase. It is the part when the rate of elimination exceeds rate of absorption.