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The first-pass metabolism or the first-pass effect or presystemic metabolism is the phenomenon which occurs whenever the drug is administered orally, enters the liver, and suffers extensive biotransformation to such an extent that the bioavailability is drastically reduced, thus showing subtherapeutic action (Chordiya et al., ). It happens. Feb 29,  · After oral administration, many drugs (morphine, pentazocine) are absorbed intact from the small intestine and trasported first via the portal system to the liver, where they undergo extensive metabolism. This process is called the first-pass effect. Although every tissue has some ability to metabolize drugs, the liver is the principal organ of drug metabolism. Aug 30,  · Metabolism. Metabolism is the processing of the drug by the body into subsequent compounds. This is often used to convert the drug into more water-soluble substances that will progress to renal clearance or, in the case of prodrug administration such as codeine, metabolism may be required to convert the drug into active metabolites. Read more

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