With simultaneous use with rifampicin and isoniazid, the concentration of ketoconazole in the plasma decreases.
When used simultaneously with cyclosporine, indirect anticoagulants and methylprednisolone ketoconazole can increase the concentration of the latter in the plasma.
Ethanol and other hepatotoxic drugs increase the risk of developing the hepatic parenchyma.
Increases the concentration of sulfonylurea derivatives and increases the risk of hypoglycemia.
Weaken the effect of amphotericin B.
Increases the concentration in the plasma of digoxin, midazolam and triazolam.
Increases the bioavailability of indinavir.
Reduces the stimulating effect of corticotropin on the adrenal glands.
When combined with terfenadine, astemizole and cisapride, increases the risk of severe ventricular tachycardia, incl. type "pirouette".
Increases the risk of bleeding "breakthrough" when using single-stage oral contraceptives with a low content of hormones.
Increases the toxicity of phenytoin.