This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Pharmacology, Subject name: Pharmacology
Steady state concentration is achieved in how many half-lives: 
Select and explain. 
A. 3-Feb, B. 4-Mar, C. 5-Apr, D. 6-May
C: 5-Apr
Answer: C: 5-Apr 
Explanation: Ans. C. 4-5If fixed dose of drug is administered at regular intervals. Rate of administration becomes equal to rate of elimination. Plasma concentration stabilizes. This is known as steady state concentration. Time taken to reach steady state is 4-5 half lives.