| When using any concomitant medication the corresponding label should be consulted for information on the route of metabolism. Miconazole can inhibit the metabolism of drugs metabolised by the CYP3A4 and CYP2C9 enzyme systems. This can result in an increase and/or prolongation of their effects, including adverse effects.:Oral miconazole is contraindicated with the coadministration of the following drugs that are subject to metabolism by CYP3A4 (See Section 4.3 Contraindications);- Substrates known to prolong the QT-interval e.g., astemizole, cisapride, dofetilide, mizolastine, pimozide, quinidine, sertindole and terfenadine- Ergot alkaloids- HMG-CoA reductase inhibitors such as simvastatin and lovastatin- Triazolam and oral midazolamWhen coadministered with oral miconazole the following drugs should be used with caution because of a possible increase or prolongation of the therapeutic outcome and/or adverse events. If necessary, their dosage should be reduced and, where appropriate, plasma levels monitored:Drugs subject to metabolism by CYP2C9 (see Section 4.4 Special Warnings and Precautions for Use);- Oral anticoagulants such as warfarin- Oral hypoglycaemics such as sulphonylureas- PhenytoinOther drugs subject to metabolism by CYP3A4;- HIV Protease Inhibitors such as saquinavir;- Certain antineoplastic agents such as vinca alkaloids, busulfan and docetaxel;- Certain calcium channel blockers such as dihydropyridines and verapamil;- Certain immunosuppressive agents: cyclosporin, tacrolimus, sirolimus (= rapamycin)- Others: , carbamazepine, cilostazol, disopyramide, buspirone, alfentanil, sildenafil, alprazolam, brotizolam, midazolam IV, rifabutin, methylprednisolone, trimetrexate, ebastine and reboxetine. | |