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A 28-year-old male asked:

What is the definition or description of: half-life?

1 doctor answer4 doctors weighed in
Dr. Peter Kurzweil
Internal Medicine 51 years experience
Time drug is active.: The half-life of a drug is a measurement of time from the drug entering the blood stream until the body (usually the liver or kidneys) metabolizes 1/2 of the drug into an inactive form. So, if the alcohol level in the body is 1%, the period of time for that level to become 1/2 % is the half-life of that amount of alcohol in that person, at a particular time.
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Last updated Mar 13, 2019

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