The strength or effectiveness of a drug in producing its desired effects is called what?

• A. Potency
• B. Opioid replacement therapy
• C. Pink cloud
• D. Physical dependence

Answer: (A)

Potency describes how much of a drug is needed to produce a given level of effect. A more potent drug achieves the same effect at a lower dose than a less potent one. This focuses on the amount required, not the maximum possible effect. It’s helpful to distinguish potency from efficacy: potency is about the dose needed for a certain response, while efficacy is about the highest level of response a drug can produce regardless of dose. So you can have a drug that is very potent but with a lower maximum effect, or another drug that is less potent but can achieve a greater maximum effect. The other terms you see refer to different ideas—treatment approaches (opioid replacement therapy), recovery phase (pink cloud), or a physiological state (physical dependence)—not the strength of the drug’s effect.