Precaution (noun) محافظ، پہلے سے احتیاط، خبر گیری

a measure taken in advance to prevent something dangerous, unpleasant, or inconvenient from happening.
Example: “he had taken the precaution of seeking legal advice”
Efficacy (noun) اثر انگیزی، اثر پیدا کرنے کی قوت

the ability to produce a desired or intended result.
Example: “there is little information on the efficacy of this treatment”
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