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Drug–drug interactions (DDIs) cause a drug to affect other drugs, leading to reduced drug efficacy or increased toxicity of the affected drug. Some well-known interactions are known to be the cause of adverse drug reactions (ADRs) that are life threatening to the patient. Traditionally, DDI have been evaluated around the selective action of drugs on specific CYP enzymes. The interaction of drugs with CYP remains very important in drug interactions but, recently, other important mechanisms have also been studied as contributing to drug interaction including transport- or UDP-glucuronyltransferase as a Phase II reaction-mediated DDI. In addition, novel mechanisms of regulating DDIs can also be suggested. In the case of the substance targeted for interaction, not only the DDIs but also the herb–drug or food–drug interactions have been reported to be clinically relevant in terms of adverse side effects. Reporting examples of drug interactions on a marketed drug or studies on new mechanisms will be very helpful for preventing the side effects of the patient taking these drugs. This Special Issue aims to highlight current progress in understanding both the clinical and nonclinical interactions of commercial drugs and the elucidation of the mechanisms of drug interactions.

Research & information: general --- Biology, life sciences --- tadalafil --- ticagrelor --- drug-drug interaction --- pharmacokinetics --- plasma concentration --- CYP3A4 --- Loxoprofen --- CYP3A --- Dexamethasone --- Ketoconazole --- CYP2D6 --- O-desmethyltramadol --- physiologically-based pharmacokinetics --- tramadol --- (‒)-sophoranone --- CYP2C9 --- potent inhibition --- in vitro --- in vivo --- drug interaction --- low permeability --- high plasma protein binding --- biflavonoid --- cytochrome P450 --- drug interactions --- selamariscina A --- uridine 5′-diphosphoglucuronosyl transferase --- tissue-specific --- systemic exposure --- P-glycoprotein (P-gp) --- organic anion transporting polypeptide 1A2 (OATP1A2) --- Rumex acetosa --- fexofenadine --- chronic kidney disease --- drug–drug interactions --- polypharmacy --- adverse drug reactions --- Lexicomp --- subset analysis --- signal detection algorithms --- spontaneous reporting systems --- mechanism-based inhibition --- competitive inhibition --- non-competitive inhibition --- substrate --- inhibitor --- cytochromes P450 --- OATP1B1 --- OATP1B3 --- tyrosine kinase inhibitors --- drug-drug interactions --- migraine --- lasmiditan --- gepants --- monoclonal antibodies --- CYP1A1 --- CYP1A2 --- drug–drug interaction --- expression --- metabolism --- regulation --- drug transporter --- ubiquitination --- ixazomib --- DDI --- computational prediction --- in silico --- QSAR --- drug metabolism --- ADME --- CYP --- metabolic DDI --- P450 --- 1A2 --- 2B6 --- 2C19 --- 2C8 --- 2C9 --- 2D6 --- 3A4 --- tadalafil --- ticagrelor --- drug-drug interaction --- pharmacokinetics --- plasma concentration --- CYP3A4 --- Loxoprofen --- CYP3A --- Dexamethasone --- Ketoconazole --- CYP2D6 --- O-desmethyltramadol --- physiologically-based pharmacokinetics --- tramadol --- (‒)-sophoranone --- CYP2C9 --- potent inhibition --- in vitro --- in vivo --- drug interaction --- low permeability --- high plasma protein binding --- biflavonoid --- cytochrome P450 --- drug interactions --- selamariscina A --- uridine 5′-diphosphoglucuronosyl transferase --- tissue-specific --- systemic exposure --- P-glycoprotein (P-gp) --- organic anion transporting polypeptide 1A2 (OATP1A2) --- Rumex acetosa --- fexofenadine --- chronic kidney disease --- drug–drug interactions --- polypharmacy --- adverse drug reactions --- Lexicomp --- subset analysis --- signal detection algorithms --- spontaneous reporting systems --- mechanism-based inhibition --- competitive inhibition --- non-competitive inhibition --- substrate --- inhibitor --- cytochromes P450 --- OATP1B1 --- OATP1B3 --- tyrosine kinase inhibitors --- drug-drug interactions --- migraine --- lasmiditan --- gepants --- monoclonal antibodies --- CYP1A1 --- CYP1A2 --- drug–drug interaction --- expression --- metabolism --- regulation --- drug transporter --- ubiquitination --- ixazomib --- DDI --- computational prediction --- in silico --- QSAR --- drug metabolism --- ADME --- CYP --- metabolic DDI --- P450 --- 1A2 --- 2B6 --- 2C19 --- 2C8 --- 2C9 --- 2D6 --- 3A4