Which term describes the dose that achieves the maximum response from a drug?

Which term describes the dose that achieves the maximum response from a drug?

• A. Dose
• B. Half-life
• C. Maximum effect
• D. Threshold dose

Answer: (C)

In pharmacology, a drug’s effect rises with dose and then levels off at a ceiling. The term for that greatest obtainable response is the maximum effect (often noted as Emax). This describes the plateau of the dose–response curve—the highest response the drug can produce, beyond which increasing the dose won’t increase effect. The other terms don’t capture this ceiling: the dose is simply the amount given; half-life refers to how long the drug stays in the body; a threshold dose is the smallest amount needed to produce any effect. So the best descriptors of the maximum achievable response is the maximum effect.

In pharmacology, a drug’s effect rises with dose and then levels off at a ceiling. The term for that greatest obtainable response is the maximum effect (often noted as Emax). This describes the plateau of the dose–response curve—the highest response the drug can produce, beyond which increasing the dose won’t increase effect. The other terms don’t capture this ceiling: the dose is simply the amount given; half-life refers to how long the drug stays in the body; a threshold dose is the smallest amount needed to produce any effect. So the best descriptors of the maximum achievable response is the maximum effect.