Leflunomide/Rifampin 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:

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:

Your body process leflunomide to its active form. Rifampin may speed up this process.

What might happen:

The amount of active drug in your blood may increase and it may cause more side effects than 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 or if you have used rifampin in the previous two weeks. Let your doctor know right away if you develop any signs of an infection such as a fever, cough, chills, or sore throat; numbness/tingling of hands/feet; hair loss; chest pain; fast/pounding heartbeat; increased thirst/urination; muscle cramps/pain; mental/mood changes; vision changes; easy bruising/bleeding, unusual growths/lumps; swollen glands (lymph nodes); unexplained weight loss; and/or unusual tiredness.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.Arava (leflunomide) US prescribing information. Aventis Pharmaceuticals, Inc. November, 2012..

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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.