Which drugs are metabolized by P450?
Which drugs are metabolized by P450?
Among the drugs metabolized are sedatives such as midazolam, triazolam and diazepam, the antidepressives amitriptyline and imipramine, the anti-arryhthmics amiodarone, quinidine, propafenone and disopyramide, the antihistamines terfenadine, astemizole and loratidine, calcium channel antagonists such as diltiazem and …
What are cytochrome P450 inducers and inhibitors?
Cytochrome P-450 enzyme inducers (e.g., rifampin, phenytoin, phenobarbital) decrease the bioavailability and increase the clearance of verapamil and diltiazem. Conversely, the enzyme inhibitor cimetidine increases the bioavailability and decreases the clearance of calcium antagonists.
Does gemfibrozil inhibit CYP450?
Drug Metab Dispos.
What drugs are CYP3A4 inhibitors?
To date, the identified clinically important mechanism-based CYP3A4 inhibitors mainly include macrolide antibiotics (eg, clarithromycin and erythromycin), anti-HIV agents (eg, ritonavir and delavirdine), antidepressants (eg, fluoxetine and fluvoxamine), calcium channel blockers (eg, verapamil and diltiazem), steroids …
What drugs are CYP3A inhibitors?
CYP3A inducers include the glucocorticoids, rifampin, carbamazepine, phenobarbital, and phenytoin. Among the many significant CYP3A inhibitors are grapefruit juice, erythromycin, ketoconazole, clarithromycin, and verapamil.
What is hepatic metabolism of drugs?
The constellation of chemical alterations to drugs or metabolites that occur in the liver,carried out by microsomal enzyme systems, which catalyze glucuronide conjugation, drug oxidation, reduction and hydrolysis.
What foods are CYP3A4 inhibitors?
The inhibition of CYP3A4 by grapefruit juice is probably the most well-known example of food-drug inhibition [76, 163]. It was suggested that the flavanone naringin, the predominant flavanone in grapefruit, might be responsible for the observed interaction effect [164].
Is gemfibrozil a CYP inhibitor?
In vivo, gemfibrozil is a fairly selective CYP2C8 inhibitor, which lacks significant inhibitory effect on other CYP enzymes. Gemfibrozil can, however, have a smaller but clinically meaningful inhibitory effect on membrane transporters, such as organic anion transporting polypeptide 1B1 and organic anion transporter 3.
Is grapefruit a 3A4 inhibitor?
Grapefruit juice, a beverage consumed in large quantities by the general population, is an inhibitor of the intestinal cytochrome P-450 3A4 system, which is responsible for the first-pass metabolism of many medications.
Does grapefruit affect metabolism?
The effect of grapefruit juice on drug metabolism is most pronounced in drugs with a high first-pass metabolism (eg, felodipine, amiodarone), in which it inhibits the first-pass metabolism of the CYP 3A4 substrates leading to an increase in Cmax and area under the concentration time curve (AUC).