Main Difference
The main difference between Efficacy and Effectiveness is that the Efficacy is a able to finish something satisfactorly and Effectiveness is a capability of producing the desired result
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Efficacy
Efficacy is the ability to get a job done satisfactorily. The word comes from the same roots as effectiveness, and it has often been used synonymously, although in pharmacology a distinction is now often made between efficacy and effectiveness. The word efficacy is used in pharmacology and medicine to refer both to the maximum response achievable from a pharmaceutical drug in research settings, and to the capacity for sufficient therapeutic effect or beneficial change in clinical settings.
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Effectiveness
Effectiveness is the capability of producing a desired result or the ability to produce desired output. When something is deemed effective, it means it has an intended or expected outcome, or produces a deep, vivid impression.
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Efficacy (noun)
Ability to produce a desired effect under ideal testing conditions.
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Efficacy (noun)
Degree of ability to produce a desired effect.
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Effectiveness (noun)
The property of being effective, of achieving results.
“The effectiveness of the drug was well established.”
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Effectiveness (noun)
The capacity or potential for achieving results.
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Effectiveness (noun)
The degree to which something achieves results.
“He questioned the effectiveness of the treatment.”
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Efficacy (noun)
the ability to produce a desired or intended result
“there is little information on the efficacy of this treatment”