half-life (medicine) - Hutchinson encyclopedia article about half-life (medicine) Printer Friendly
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half-life (medicine)

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half-life

In medicine, the time taken for the peak plasma concentration of a drug to decline by half. This is due to redistribution of the drug from the plasma to the tissues and to metabolism and excretion of the drug. The half-life of the drug is one of the factors that determines the frequency of administration required to achieve optimal therapeutic effects.
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