What is the maximum therapeutic effect of a drug?

A. Peak effect: The peak effect of a drug is the point at which it produces its maximum therapeutic response in the body. It reflects the highest concentration at the site of action and helps guide optimal dosing schedules to achieve effective treatment without causing toxicity. B. Steady state: Steady state refers to the point at which the drug’s intake and elimination are balanced, resulting in consistent plasma levels. It does not indicate the maximum effect but ensures ongoing therapeutic levels over time. C. Duration of action: Duration of action is the total time a drug produces a therapeutic effect, not the intensity or maximum response. It helps determine how often a medication should be administered to maintain efficacy. D. Onset of action: Onset of action is the time it takes for a drug to begin producing a noticeable effect after administration. It indicates how quickly a drug works, not the magnitude of its effect.