title: Cytochrome P-450 monooxygenases and interactions of psychotropic drugs.
abstract: The authors review drug biotransformation. Phase I reactions are preconjugation processes that take place through cytochrome P-450--a hepatic mixed function oxidase (MFO) enzyme system with multiple isozymes to metabolize foreign substances. Phase II reactions are conjugation processes of the substrates. Based on the characteristics of the cytochrome P-450 microsomal enzyme systems, the authors explain the clinical phenomena of induction and inhibition of these enzymes when psychotropic agents interact. This article describes both MFO inducers (barbiturates) and inhibitors (cimeditine, fluoxetine and neuroleptic drugs). With this information, clinicians can enhance the ability to monitor drug interactions of psychotropic agents.
authors.affiliation: Department of Psychiatry and Human Behavior, St Louis University School of Medicine.
authors.forename: W W
authors.initials: WW
authors.lastname: Shen
authors.forename: K M
authors.initials: KM
authors.lastname: Lin
mesh_terms: D001711:Biotransformation / Q000502:physiology*; D065607:Cytochrome P-450 Enzyme Inhibitors; D003577:Cytochrome P-450 Enzyme System / Q000096:biosynthesis / Q000502:physiology*; D004347:Drug Interactions; D006801:Humans; D008862:Microsomes, Liver / Q000201:enzymology; D006899:Mixed Function Oxygenases / Q000037:antagonists & inhibitors / Q000096:biosynthesis / Q000502:physiology*; D011619:Psychotropic Drugs / Q000009:adverse effects / Q000493:pharmacokinetics*
chemical_list: D065607:Cytochrome P-450 Enzyme Inhibitors; D011619:Psychotropic Drugs; D003577:Cytochrome P-450 Enzyme System; D006899:Mixed Function Oxygenases