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U.S. Department of Health and Human Services

Safety

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

Detailed View: Safety Labeling Changes Approved By FDA Center for Drug Evaluation and Research (CDER) – December 2011

 

Summary View

 

CONTRAINDICATIONS

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

 

WARNINGS

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...

 

PRECAUTIONS

  • 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.

 

ADVERSE REACTIONS

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

 

PATIENT PACKAGE INSERT

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