Cyclosporine and Leflunomide interaction

Cyclosporine and Leflunomide: both prescribing labels flag this combination with the strongest language, such as a contraindication, a boxed warning, or an instruction to avoid it.

Major

Do not combine without a prescriber's guidance. The label language below is the strongest FDA uses.

What the FDA labels say

From the Cyclosporine (Neoral) label · effective 2026-08-10

Major

In kidney, liver, and heart transplant patients Neoral may be administered with other immunosuppressive agents.

Boxed warningby drug classView label on DailyMed
Major

For Psoriasis Patients (see also BOXED WARNING above) Psoriasis patients previously treated with PUVA and to a lesser extent, methotrexate or other immunosuppressive agents, UVB, coal tar, or radiation therapy, are at an increased risk of developing skin malignancies when taking Neoral.

Boxed warningby drug classView label on DailyMed
Major

Psoriasis Psoriasis patients who are treated with Neoral should not receive concomitant PUVA or UVB therapy, methotrexate or other immunosuppressive agents, coal tar or radiation therapy.

Contraindicationsby drug classView label on DailyMed
Moderate

Malignancies As in patients receiving other immunosuppressants, those patients receiving cyclosporine are at increased risk for development of lymphomas and other malignancies, particularly those of the skin.

Warningsby drug classView label on DailyMed
Moderate

Because of the danger of oversuppression of the immune system resulting in increased risk of infection or malignancy, a treatment regimen containing multiple immunosuppressants should be used with caution.

Warningsby drug classView label on DailyMed

From the Leflunomide (Arava) label · effective 2025-06-04

Moderate

If used with concomitant methotrexate and/or other potential immunosuppressive agents, chronic monitoring should be monthly.

Warnings and precautionsby drug classView label on DailyMed
Minor

These events have been reported most frequently in patients who received concomitant treatment with methotrexate or other immunosuppressive agents, or who had recently discontinued these therapies; in some cases, patients had a prior history of a significant hematologic abnormality.

Warnings and precautionsby drug classView label on DailyMed

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Not medical advice. Interaction Checker quotes FDA label text and NIH fact sheets. Whether an interaction matters for you depends on doses, timing, kidney and liver function, and other conditions. Confirm with a pharmacist or prescriber.