<p>Posaconazole is an inhibitor of CYP3A4 and should only be used under specific circumstances during treatment with other medicinal products that are metabolized by CYP3A4 like Midazolam, Triazolam, Alprazolam. Posaconazole concentrations may be significantly lowered in combination with Rifamycin antibacterials (Rifampicin, Rifabutin), certain anticonvulsants (Phenytoin, Carbamazepine, Phenobarbital, Primidone and Efavirenz).</p>