Norvir (ritonavir) Soft Gel capsules, tablets and oral solution

Detailed View: Safety Labeling Changes Approved By FDA Center for Drug Evaluation and Research (CDER)  

March 2015

Summary View


Established and Other Potentially Significant Drug Interactions
  • HCV-Protease Inhibitor: simeprevir added to Table

Patient Information

  • Addition of simeprevir to “Especially tell your doctor if you take” section

[Norvir also part of "HIV protease inhibitor drug-drug interactions" class labeling change, March 2015]


December 2011

Summary View 


  • hypersensitivity...(e.g. toxic epidermal necrolysis (TEN) or Stevens Johnson syndrome)



Drug Interactions
  • Information regarding coadministration with CYP3A inhibitors...Norvir is a CYP3A4 inhibitor. Initiating treatment with Norvir in patients receiving medications metabolized by CYP3A4 or initiating medications metabolized by CYP3A4 in patients already maintained on Norvir may result in increased plasma concentrations...



  • Table 6 section of the PI with new information on drug interactions with fentanyl, dasatinib and nilotinib
  • A decrease in the dosage or an adjustment of the dosing interval of nilotinib and dasatinib may be necessary for patients requiring co-administration with strong CYP3A inhibitors such as Norvir. Please refer to the nilotinib and dasatinib prescribing information for dosing instructions.
  • Concentrations of fentanyl are expected to increase. Careful monitoring of therapeutic and adverse effects (including potentially fatal respiratory depression) is recommended when fentanyl is concomitantly administered with Norvir.



  • toxic epidermal necrolyis (TEN)
  • and drug interactions with fentanyl, dasatinib and nilotinib



What should I tell my doctor before taking Norvir?
  • new information on drug interactions with fentanyl, dasatinib and nilotinib


Page Last Updated: 04/15/2015
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