A basic conceptual and practical overview of interactions with highly prescribed drugs.

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Dresser GK, Bailey DG

A basic conceptual and practical overview of interactions with highly prescribed drugs.

Can J Clin Pharmacol. 2002 Winter;9(4):191-8.

PubMed ID

12584577 [ View in PubMed

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Abstract

Drug interactions are frequently the result of altered activity of the mechanism(s) responsible for drug elimination. These include drug metabolism mediated by a select group of cytochrome P450 enzymes (CYP3A4, CYP2D6, CYP2C9, CYP2C19, CYP1A2) and drug transporters (P-glycoprotein). Adverse drug interactions can result from induction (loss of therapeutic benefit) or inhibition (increased toxicity from excessive effect) of drug elimination. CYPs and P-glycoprotein are discussed individually with regards to their characteristics, frequently prescribed drug substrates, inducers and inhibitors, and important adverse drug events. The potential for important drug interactions can be predicted based on the properties of the causative agent (oral bioavailability, mechanism of elimination, seriousness of adverse event) and the interacting agent. Consequently, drug interactions can be prevented by avoiding concomitant administration of interacting substances or possibly implementing alternative therapeutic strategies. Furthermore, susceptibility to adverse events depends not only on the interacting substances, but also on the patient and the method of drug administration. Commonly prescribed drugs that are unlikely to cause a drug interaction involving CYPs or P-glycoprotein are also discussed.

DrugBank Data that Cites this Article

Drug Enzymes

Drug	Enzyme	Kind	Organism	Pharmacological Action	Actions
Liotrix	Cytochrome P450 3A4	Protein	Humans	No	Substrate	Details