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OPRA Pharmacokinetics and Pharmacodynamics QUESTION #3846
Question 1
Which of the following characteristics is a defining feature of drugs exhibiting non-linear (saturable) pharmacokinetics?
  • A constant ratio of drug metabolites is formed as the administered dose increases
  • The elimination half-life increases as the administered dose is increased✔️
  • The area under the curve (AUC) increases in direct proportion to an increase in the administered dose
  • The steady-state drug concentration increases in direct proportion to the dosing rate
Correct Answer Explanation
In non-linear pharmacokinetics, metabolic enzymes become saturated at higher doses. This leads to disproportionately longer half-lives, higher AUC, and unpredictable dose–concentration relationships.