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How are veterinary drugs retained and eliminated in animal foods?

The drug is absorbed, distributed, metabolized and excreted by animals.

"Absorption" is the process by which a drug enters the bloodstream from the site of administration. "Distribution" is the process of drug transport from blood to tissues and cells after absorption. These two processes mainly affect the retention of drugs in various tissues of the animal.

"Metabolism" is the process in which the animal body changes the structure or activity of a drug through a certain mechanism. "Excretion" is the process by which the precursor or metabolite of a drug is excreted from the animal. These two processes are the elimination of drugs from the animal.

Thus, these four processes determine how much and how long a drug remains in an animal.