effectiveness effectiveness
How well a treatment works.
Example of effectiveness in a sentence
Effectiveness refers to how well a treatment, medicine, or vaccine works in people who use it after it has been approved.
More Info
Effectiveness refers to how well a treatment works in the real world, not in a planned clinical trial. Usually effectiveness is assessed after approval by health or government authorities.
Other info to think about when joining a study
The word “effectiveness” commonly comes up in the context of already approved medications.
In contrast, “efficacy” refers to how well a study treatment works in a study.
The words “effectiveness” and “efficacy” are sometimes used to mean the same thing even though they have slightly different meanings.
Other Resources
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Version 2.0 September 2024
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