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 in semester exam.

The origin of the question is Pharmacokinetic topic in division Pharmacokinetic Drug Interactions & Basic Considerations of Drug Biotechnology

Answer 1

Right answer is (c) Absorption phase

The best I can explain: Absorption phase is when the rate of absorption is greater than the rate of elimination. It is the left side of the curve. The peak represents the time when the absorption rate is equal to the elimination rate of drug.