Known interactions between the following drugs: Efavirenz, Vfend Injection

Voriconazole may inhibit the breakdown of efavirenz in the body. This could result in elevated blood levels of efavirenz, which could increase the risk for side effects from efavirenz. On the other hand, efavirenz may speed up the breakdown of voriconazole resulting in lower than desired blood levels of voriconazole. This could make voriconazole less effective. It is best to avoid taking these two medications together. Ask your healthcare provider about these drugs and this potential interaction as soon as possible.