Question

In the equation dX/dt = – K\textsubscript{E}X, what does X stand for?

• A. First order elimination rate constant
• B. Distribution exponent
• C. Amount of drug in the body at any time
• D. Elimination exponent

Hint:

In first-order kinetics: X = drug amount; K\textsubscript{E} = elimination rate constant.

Answer 1

The Correct Option is C

In the first-order elimination equation dX/dt = – K\textsubscript{E}X, X denotes the amount of drug in the body at any time. The rate of elimination is directly proportional to this amount.