What is the difference between efficacy, effectiveness & efficiency of a drug?
The terminology makes no difference. Essentially the difference in the degree of efficiency.
To add to the previous answer with which I totally agree
efficiency is the ability to obtain the maximum possible benefit, given the resources available.
effectiveness is the benefit of using a technology, programme or intervention to address a specific problem under general or routine conditions, rather than under controlled conditions, for example, by a physician in a hospital or by a patient at home.
efficacy is the benefit of using a technology, programme or intervention to treat a particular problem under ideal conditions.
In regard to that when for CEA data from RCT are used we have to bear in mind that in fact this is a cost efficacy rather than cost effectiveness analysis.
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