Midazolam is primarily metabolized by which enzymes?

Midazolam is primarily metabolized by which enzymes?

• A. P450 enzymes in the liver and intestines
• B. Monoamine oxidase
• C. Aldehyde dehydrogenase
• D. Cytochrome c oxidase

Answer: (A)

Midazolam is processed mainly by hepatic and intestinal cytochrome P450 enzymes, especially CYP3A4. This enzyme hydroxylates midazolam to 1-hydroxymidazolam, which is then further conjugated and cleared. The involvement of CYP3A4 explains both its reduced oral bioavailability (due to first-pass metabolism in the gut and liver) and the potential for drug interactions when CYP3A4 is inhibited or induced. Other enzymes listed don’t metabolize benzodiazepines: monoamine oxidase targets monoamines, aldehyde dehydrogenase acts on aldehydes, and cytochrome c oxidase is part of the electron transport chain and not involved in drug metabolism.

Midazolam is processed mainly by hepatic and intestinal cytochrome P450 enzymes, especially CYP3A4. This enzyme hydroxylates midazolam to 1-hydroxymidazolam, which is then further conjugated and cleared. The involvement of CYP3A4 explains both its reduced oral bioavailability (due to first-pass metabolism in the gut and liver) and the potential for drug interactions when CYP3A4 is inhibited or induced. Other enzymes listed don’t metabolize benzodiazepines: monoamine oxidase targets monoamines, aldehyde dehydrogenase acts on aldehydes, and cytochrome c oxidase is part of the electron transport chain and not involved in drug metabolism.