The half-life of a drug is the time taken for the plasma concentration of a drug to reduce to half its original value.
For example: The half-life of Ambien is about 2 hours.
If you took a 10mg Ambien tablet at 8pm then by 10pm there would be 5mg remaining in your system and by 12pm there would be 2.5mg in your system and so on and so on...
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