Selected Protease Inhibitors/Rifabutin; Rifapentine Interactions

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.

Medical warning:

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:

When these two medicines are taken together, your body may not process them properly.

What might happen:

Your blood levels of rifabutin may increase and cause harmful effects. Rifabutin and rifapentine may decrease the levels of some protease inhibitors, which may decrease their effectiveness.

What you should do about this interaction:

Make sure that your healthcare professionals (e.g. doctor or pharmacist) know that you are taking these medicines together. If you experience a persistent sore throat or fever, contact your doctor. The dose of your medicines may need adjusting.Your healthcare professionals may already be aware of this drug 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.Agenerase (amprenavir) Australian prescribing information. GlaxoSmithKline Australia Pty Ltd. November 24, 2004.
  • 2.Agenerase (amprenavir) summary of product characteristics. GlaxoSmithKline UK January 18, 2005.
  • 3.Agenerase (amprenavir) Capsules US prescribing information. GlaxoSmithKline May, 2005.
  • 4.Telzir (fosamprenavir calcium) Australian prescribing information. GlaxoSmithKline Australia Pty Ltd. November 24, 2004.
  • 5.Telzir (fosamprenavir calcium) UK summary of product characteristics. GlaxoSmithKline UK October 18. 2013.
  • 6.Lexiva (fosamprenavir calcium) US prescribing information. GlaxoSmithKline March, 2019.
  • 7.Crixivan (indinavir sulfate) Australian prescribing information. Merck Sharp & Dohme (Australia) Pty Ltd. August 11, 2003.
  • 8.Crixivan (indinavir sulfphate) UK summary of product characteristics. Merck Sharp & Dohme Limited September, 2008.
  • 9.Crixivan (indinavir sulfate) US prescribing information. Merck & Co., Inc. September, 2016.
  • 10.Viracept (nelfinavir mesylate) Australian prescribing information. Roche Products Pty Ltd. October 26, 2000.
  • 11.Viracept (nelfinavir mesylate) UK summary of product characteristics. Roche Products Limited August 4, 2008.
  • 12.Viracept (nelfinavir mesylate) US prescribing information. Agouron Pharmaceuticals, Inc. September, 2016.
  • 13.Invirase (saquinavir mesylate) US prescribing information. Roche Laboratories, Inc. March, 2019.
  • 14.Mycobutin (rifabutin) US prescribing information. Pfizer Inc. July, 2015.
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  • 17.Reyataz (atazanavir sulfate) US prescribing information. Bristol-Myers Squibb Company March, 2018.
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CONDITIONS OF USE: The information in this database is intended to supplement, not substitute for, the expertise and judgment of healthcare professionals. The information is not intended to cover all possible uses, directions, precautions, drug interactions or adverse effects, nor should it be construed to indicate that use of a particular drug is safe, appropriate or effective for you or anyone else. A healthcare professional should be consulted before taking any drug, changing any diet or commencing or discontinuing any course of treatment.