Which organ is mainly involved in the removal and breakdown of circulating drugs?

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Multiple Choice

Which organ is mainly involved in the removal and breakdown of circulating drugs?

The liver is the primary site for removing and breaking down circulating drugs because it contains a large complement of drug‑metabolizing enzymes that chemically modify substances in the blood. Hepatic enzymes, especially the cytochrome P450 family, perform oxidation and other reactions (Phase I), followed by conjugation (Phase II) to make drugs more water‑soluble. This biotransformation prepares drugs for excretion, either into the urine or into bile. While the kidneys mainly filter waste to form urine and clear some drugs unchanged, they don’t generally metabolize drugs to the same extent as the liver. The pancreas and spleen don’t play major roles in drug metabolism.

The liver is the primary site for removing and breaking down circulating drugs because it contains a large complement of drug‑metabolizing enzymes that chemically modify substances in the blood. Hepatic enzymes, especially the cytochrome P450 family, perform oxidation and other reactions (Phase I), followed by conjugation (Phase II) to make drugs more water‑soluble. This biotransformation prepares drugs for excretion, either into the urine or into bile. While the kidneys mainly filter waste to form urine and clear some drugs unchanged, they don’t generally metabolize drugs to the same extent as the liver. The pancreas and spleen don’t play major roles in drug metabolism.

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