The time required for the amount of drug in the body to decrease by 50% is called:

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The time required for the amount of drug in the body to decrease by 50% is called half-life. A is incorrect because steady state refers to a state where the amount of drug being administered is equal to the amount being eliminated. C is incorrect because phase II metabolism refers to the conversion of drugs into water-soluble metabolites that are more readily excreted by the body. D is incorrect because reduced bioavailability time is not a commonly used term in pharmacology.

The Time Required for the Amount of Drug in the Body