Which term denotes the greatest response a drug can produce, regardless of dose?

Which term denotes the greatest response a drug can produce, regardless of dose?

• A. Maximum effect
• B. Potency
• C. Therapeutic index
• D. Effective dose

Answer: (A)

In pharmacology, the term describes the greatest response a drug can produce, regardless of dose. That is the drug’s efficacy, often represented as the maximal effect (Emax) on a dose–response curve. It reflects the ceiling of the response the drug can achieve due to its mechanism of action. Potency is about how much drug you need to reach a given effect, so a more potent drug requires a smaller dose but isn’t about how high the effect can go. The therapeutic index is a safety measure comparing toxic and therapeutic doses, not the maximum response. The effective dose is the amount needed to produce a predefined effect in a population, which again relates to dose rather than the maximum achievable response.

In pharmacology, the term describes the greatest response a drug can produce, regardless of dose. That is the drug’s efficacy, often represented as the maximal effect (Emax) on a dose–response curve. It reflects the ceiling of the response the drug can achieve due to its mechanism of action. Potency is about how much drug you need to reach a given effect, so a more potent drug requires a smaller dose but isn’t about how high the effect can go. The therapeutic index is a safety measure comparing toxic and therapeutic doses, not the maximum response. The effective dose is the amount needed to produce a predefined effect in a population, which again relates to dose rather than the maximum achievable response.