potency
POH-tuhn-see
/ˈpoʊtnsi/
A measure of drug activity expressed in terms of the amount or dose required to produce an effect of a given intensity.
A highly potent drug produces a strong response at a very small concentration; it does not necessarily mean it achieves a higher maximum cure rate than less potent drugs.
The story behind the word. Traced to Latin 'potentia' (power, force), from 'potens' (able, capable), the present participle of 'posse' (to be able). In pharmacology, it evolved to quantify the precise dose concentration required to activate biological receptors.
Word relationships
- strength: Strength is a general term describing power, whereas potency specifically relates concentration to biological effect size.
- impotence: Lack of power or therapeutic strength.
- weakness: Low concentration or low ability to induce biological change.
Commonly confused with
- efficacy: Potency reflects the dose size needed for an effect, while efficacy reflects the maximum possible response the drug can produce.
Word family
- potent (adjective): Having great power, influence, or biological effect.
- potently (adverb): In a powerful or strongly effective manner.
Collocations
- high potency
- relative potency
- loss of potency
- analgesic potency
- potency ratio
Example sentences
- "Fentanyl possesses much higher analgesic potency than morphine, requiring significantly smaller doses to control pain." Pharmacological Research
- "Exposure to high temperatures can diminish the potency of insulin over time." Drug Formulation
Memory hook
POTENCY = POWER in a tiny drop. Small dose, big impact. Potency is about DOSE SIZE needed for action.
When not to use
Do not use 'potency' as a synonym for overall success or clinical cure rate; that is efficacy.
Fun facts
- In toxicology, the potency of lethal venoms is measured using the LD50 metric—the lethal dose required to kill 50% of a test population.
Related words
Take your vocabulary further with LangBlitz
Our English vocabulary app: FSRS spaced repetition, 5,000+ curated words across 119 topic groups, CEFR A1 to C2. Explore your mastery with the beautiful Vocabulary World feature.