Moderate. These medicines may cause some risk when taken together. Contact your healthcare professional (e.g. doctor or pharmacist) for more information.
How the interaction occurs:
Telaprevir may slow down how quickly your body processes tenofovir.
What might happen:
The amount of tenofovir in your blood may increase and cause more side effects than normally expected.
What you should do about this interaction:
Let your healthcare professionals (e.g. doctor or pharmacist) know that you are taking these medicines together. Contact your doctor if you experience any stomach pain/nausea/vomiting, chills, unusual tiredness or weakness, dizziness, lightheadedness, a fast or irregular heartbeat, yellowing of the eyes or skin, dark urine, light-colored stools, or loss of appetite.Your healthcare professionals may already be aware of this interaction and may be monitoring you for it. Do not start, stop, or change the dosage of any medicine before checking with them first.Reference:1.Incivek (telaprevir) US prescribing information. Vertex Pharmaceuticals Incorporated October, 2013.