This information is generalized and not intended as specific medical advice. Consult your healthcare professional before taking or discontinuing any drug or commencing any course of treatment.
Serious. These medicines may interact and cause very harmful effects. Contact your healthcare professional (e.g. doctor or pharmacist) for more information.
How the interaction occurs:
Ritonavir may speed up how quickly your liver processes voriconazole. Voriconazole may speed up how quickly your liver processes ritonavir.
What might happen:
Your voriconazole and ritonavir may not work as well.
What you should do about this interaction:
Let your healthcare professionals (e.g. doctor or pharmacist) know that you are taking these medicines together. Your doctor may want to change your medicines.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.
1.Vfend (voriconazole) US prescribing information. Pfizer Inc. November, 2011.
2.Norvir (ritonavir) US prescribing information. Abbott Laboratories November, 2012.
3.Mikus G, Schowel V, Drzewinska M, Rengelshausen J, Ding R, Riedel KD, Burhenne J, Weiss J, Thomsen T, Haefeli WE. Potent cytochrome P450 2C19 genotype-related interaction between voriconazole and the cytochrome P450 3A4 inhibitor ritonavir. Clin Pharmacol Ther 2006 Aug;80(2):126-35.
4.Purkins L, Wood N, Kleinermans D, Love ER. No clinically significant pharmacokinetic interactions between voriconazole and indinavir in healthy volunteers. Br J Clin Pharmacol 2003 Dec;56 Suppl 1:62-8.