Steady state occurs when a drug given at regular intervals leads to what?

Steady state occurs when a drug given at regular intervals leads to what?

• A. When absorption and elimination are fairly constant
• B. Immediately
• C. Four times a day
• D. Time of peak plasma concentration

Answer: (A)

Steady state means the amount of drug entering the body each dosing interval equals the amount being eliminated in that same interval, so the plasma concentration settles into a relatively constant level. When a drug is given at regular intervals, absorption and elimination eventually balance out, especially with first‑order elimination where the rate of loss is proportional to concentration, leading to a stable average concentration after several half-lives. This balance explains why the idea of absorption and elimination being fairly constant is the best description. Steady state isn’t achieved immediately, nor is it defined by a particular dosing frequency or the exact time of the peak concentration; those factors influence how quickly steady state is reached and the size of fluctuations, but not the defining balance itself.

Steady state means the amount of drug entering the body each dosing interval equals the amount being eliminated in that same interval, so the plasma concentration settles into a relatively constant level. When a drug is given at regular intervals, absorption and elimination eventually balance out, especially with first‑order elimination where the rate of loss is proportional to concentration, leading to a stable average concentration after several half-lives. This balance explains why the idea of absorption and elimination being fairly constant is the best description. Steady state isn’t achieved immediately, nor is it defined by a particular dosing frequency or the exact time of the peak concentration; those factors influence how quickly steady state is reached and the size of fluctuations, but not the defining balance itself.