What is mean when a medication has a half-life?


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A medication's half-life "is the time it takes for the plasma concentration of a drug to reach half of its original concentration. More simply put, the half-life of a drug is how long it takes for half of it to be eliminated from the bloodstream.
A half-life is the time it takes for half of the substance to be dissolved. For example, if a medication has a half-life of 4 hours, it means in 4 hours, only half of the medication will be left, in another 4 hours, only a quarter will be left, etc.

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