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Azathioprine

Also indexed as: Imuran®

Azathioprine is used to prevent organ rejection following kidney transplant and to treat severe cases of rheumatoid arthritis.

Interaction with Herbs

Folic acid
People receiving dialysis for kidney failure often have low blood levels of folic acid. However, folic acid blood levels should return to normal following kidney transplant. A preliminary study of people taking azathioprine to prevent organ rejection revealed that blood levels of folic acid remained well below those of individuals not taking the drug. The highest blood folic acid level was observed in an individual who had not taken azathioprine for two years.1 Controlled studies are needed to determine whether people taking azathioprine should supplement with folic acid.

Summary of Interactions for Azathioprine

Depletion or interference Folic acid
Adverse interaction None known
Side effect reduction/prevention None known
Supportive interaction None known
Reduced drug absorption/bioavailability None known

For the convenience of the reader, the information in the summary is categorized as follows: “Depletion or interference” indicates the drug may deplete or interfere with the absorption or function of the supplement or herb. “Adverse interaction” indicates that the supplement or herb used together with the drug may result in undesirable effects. “Side effect reduction/prevention” indicates the supplement or herb may reduce the likelihood and/or severity of a potential side effect caused by the drug. “Supportive interaction” indicates the supplement or herb may support or aid the function of the drug. “Reduced drug absorption/bioavailability” indicates that the supplement or herb may decrease the absorption and/or activity of the drug in the body. An asterisk (*) next to an item in the summary indicates that the interaction is supported only by weak, fragmentary, and/or contradictory scientific evidence.

References:

1. Zazgornik J, Druml W, Balcke P, et al. Diminished serum folic acid levels in renal transplant recipients. Clin Nephrol 1982;18:306–10.