Increase in the concentration of interacting drugs
Itraconazole is a potent inhibitor CYP3A4 and P-glycoprotein, can enhance and / or prolong the action of drugs whose metabolism is associated with CYP3A4.
Drugs that increase the concentration of itraconazole in the blood plasma
Strong inhibitors CYP3A4 can increase the bioavailability of itraconazole: antibacterial drugs (ciprofloxacin, clarithromycin, erythromycin), antiviral agents (darunavir, potentiated with ritonavir, fosamprenavir, potentiated with ritonavir, indinavir, ritonavir). These medications should be used with caution in case of need of a co-administration with itraconazole. Status of patients who receive therapy with potent inhibitors CYP3A4, should be carefully monitored for the development of symptoms of amplification or prolongation of pharmacological effects of itraconazole, if necessary, the dose of itraconazole should be reduce.
Medications, the concentration of which in the blood plasma can increase when combined with itraconazole
Itraconazole and its main metabolite hydroxyitraconazole may interfere with the metabolism of drugs metabolized by the isoenzyme CYP3A4, and to prevent transportation of drugs under the action of P-glycoprotein. This can lead to an increase in the plasma concentration of these drugs and / or their active metabolites when taken together with itraconazole. The increase in plasma concentration, in turn, can cause the enhancement or prolongation of both the therapeutic and undesirable effects of these drugs, resulting in potentially life-threatening conditions. An increase in the concentration of certain drugs (terfenadine, astemizole, misolastine, cisapride, dofetilide, triazolam, pimozide, quinidine, beprideil, sertindole, levacetylmetadol) may lead to an increase in the interval QT and ventricular tachyarrhythmia, including cases of ventricular pirouette tachycardia, which is potentially life-threatening. After discontinuation of treatment, the plasma concentration of itraconazole decreases to almost indeterminate within 7 to 14 days, depending on the dose of the drug and the duration of treatment. In patients with cirrhosis of the liver or those who simultaneously take inhibitors of the isoenzyme CYP3A4, a decrease in the concentration of the drug can be very slow. This is especially important at the time of initiation of therapy with the use of drugs, the metabolism of which is affected itraconazole.
Interactive drugs are divided according to the following principle:
"Contraindicated" - under no circumstances should both joint use and their use be allowed within two weeks after discontinuation of itraconazole therapy.
"Not recommended" - this combination should be avoided during treatment with itraconazole and within two weeks after discontinuation of therapy, however, in some cases, if the expected benefit exceeds the risk for a particular patient,subject to appropriate monitoring and control, such a combination is permissible.
"Carefully" - When combined with itraconazole, careful monitoring, monitoring of the effectiveness and side effects of the drugs used is recommended.
Contraindicated joint use with the following drugs: levacetyl methadone, methadone, disopyramide, dofetilide, dronedaron, quinidine, halofantrine, astemizole, misolastine, terfenadine, ergot alkaloids (dihydroergotamine, ergometrine, methylergotamine, ergotamine), irinotecan, midazolam (for oral administration), lourazidone, pimozide, sertindole, triazolam, bepridil, felodipine, lercanidipine, nisoldipine, ivabradine, ranolazine, eplerenone, cisapride, atorvastatin, lovastatin, simvastatin, colchicine (in patients with hepatic or renal insufficiency).
Not recommended for joint use with the following drugs: tamsulosin, fentanyl, rifabutin, rivaroxaban, carbamazepine, dasatinib, nilotinib, trabetedin, aliskiren, everolimus, salmeterol, vardenafil, colchicine.
Carefully: alfentanil, buprenorphine for intravenous or sublingual administration, oxycodone, digoxin, coumarins, cilostazol, dabigatran, repaglinide, saxagliptin, praziquantel, ebastine, eletriptan, bortezomib, busulfan, docetaxel, erlotinib, Ixabepilone, lapatinib, trimetrexate, vinca alkaloids, alprazolam, aripiprazole, brotisolam, buspirone, haloperidol, midazolam for intravenous administration, perosporone, quetiapine, ramelteon, risperidone, maraviroc, indinavir, ritonavir, saquinavir, nad, the remaining blockers of "slow" calcium channels (including dihydropyridines and verapamil), aprepitant, domperidone, budesonide, ciclesonide, ciclosporin, dexamethasone, fluticasone, methyl prednisolone, sirolimus, tacrolimus, tessirolimus, reboxetine, fesoterodine, imidafenacin, sildenafil, solifenacin, tadalafil, tolterodine, alitretinoin for oral administration, zincalcet, mozavaptan, tolvaptan.
Reduction of the concentration of interacting drugs
Co-administration with meloxicam causes a decrease in its concentration in the blood. It is necessary to monitor the effectiveness of therapy, it may be necessary to increase the dose of meloxicam.
Reduction of the concentration of itraconazole in the blood
It is not recommended simultaneous use of drugs that are strong inducers of liver enzyme systems (rifabutin, isoniazid, rifampicin, carbamazepine, phenobarbital, phenytoin, efavirenz, nevirapine), because they significantly reduce the bioavailability of itraconazole and its metabolites, which leads to a significant decrease in the effectiveness of the drug.
The bioavailability of itraconazole depends on the acidity of the gastric juice. If concurrently used drugs that reduce the pH of gastric juice (proton pump inhibitors, blockers H2-gistaminovyh receptors) it is recommended to drink itraconazole sour drinks (excluding grapefruit juice).
Antacid preparations should not be taken at least 1 hour before taking itraconazole and within 2 hours after.
It is forbidden to use itraconazole and grapefruit together (including grapefruit juice), since itraconazole may be weakened. Apparently, this is due to the fact that grapefruit juice reduces the concentration of itraconazole in the plasma by inhibiting its absorption in the gastrointestinal tract (GI tract).
Application in pediatric practice
Studies of drug interactions were conducted only in adults.