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The first pass effect (also known as first-pass metabolism or presystemic metabolism) is a phenomenon of drug metabolism at a specific location in the body which leads to a reduction in the concentration of the active drug before it reaches the site of action or systemic circulation.
First pass metabolism describes the metabolism of a drug molecules before it reaches the systemic circulation and can also be referred to as pre-systemic metabolism. Although it is possible via other routes of administration, it is predominant in drugs administered orally.
3 lis 2023 · The first-pass effect is a pharmacological phenomenon in which a medication undergoes metabolism at a specific location in the body. The first-pass effect decreases the active drug's concentration upon reaching systemic circulation or its site of action.
3 lis 2023 · The first-pass effect is a pharmacological phenomenon in which a medication undergoes metabolism at a specific location in the body. The first-pass effect decreases the active drug's concentration upon reaching systemic circulation or its site of action.
21 lip 2023 · The first pass effect, also known as first-pass metabolism, refers to the phenomenon in which a drug undergoes significant metabolism and reduction in bioavailability during its initial passage through the liver.
Before an orally absorbed drug reaches systemic circulation, it must first pass through the intestine, and then the liver where drug metabolism known as pre-systemic metabolism may occur. This is known more commonly as the first-pass effect.
27 lut 2024 · Before orally administered drugs reach the circulation, they can be metabolized within the gut wall or the liver. This is known as first-pass metabolism, which will decrease the amount of active drug absorbed. Food content appears to affect the absorption rate of many orally administered drugs.
