What does the term "half-life" mean?

Question: I think it has something to do with the time it takes for a medicine to reach its peak effectiveness in the blood. But I would like to hear from someone who knows.

Answers:
The term half life has meaning in science, engineering and medicine. It means that the time taken for something that decays or degrades to reach half its original level. In medicine it means the time taken for a drug to reach half its original concentration usually in the blood. It is a measure of how long a drug is effective and a guide to the appropriate time interval needed between doses.

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It is the duration of action of drugs. Say a drug has a half life of 8 hours then in 24 hours you need to take 3. one every eight hours and so on
The half life of a drug is the period of time required for the concentration or amount of drug in the body to be reduced by one-half

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