What Is Half-Life in the Context of Medication for Pregnant Women?

Question by rcazac: What is half-life in the context of medication for pregnant women?
I have the following sentence

“Women of child-bearing potential, defined as all women physiologically capable of becoming pregnant, must use effective contraception during the study and for 5 days (5 half-lives) after treatment”

What is “half life” in this context? Is there a synonym for it?

Best answer:

Answer by Big Daddy
If you put a quantity of a substance in the body at one time, it is not all removed at one time. The half-life refers to the time that passes before half of the substance has been removed (metabolized, excreted, deactivated, etc.) It is not related (other than the name) to radioactivity or other exponential processes that use the same term.

Importantly, you cannot model the quantity at a given time by using the exponential curves appropriate for radioactive decay.

From context, it appears the half-life of this medication is approximately one day.

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