Englishfor English speakers
efficacy
Noun
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Efficacy is the ability to produce a effect or result that is desired.
of
Preposition
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Made using.
It is a house of cards.
medicine
Noun
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Medicine is something you put into or on your body when you are sick to make yourself healthy.
After I got out of the hospital, I went to the drug store and bought medicine for my ear problem.
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Medicine is the science of health care.
The school of medicine at the University of Western Ontario has produced some of the country's best doctors.
Many doctors go to Canada but find that they can't practice medicine there.