Leflunomide interactions

Leflunomide (Arava), an immunosuppressant has 88 documented interactions across the FDA labels and fact sheets we index: 8 major, 65 moderate, 14 minor, and 1 where a label reports no significant interaction. Each entry below quotes the sentence behind it. This drug page is a starting point, not a verdict for your situation.

Major interactions (8)

  • AdalimumabimmunosuppressantMajor

    It is uncertain whether the occurrence of HSTCL is related to use of a TNF blocker or a TNF blocker in combination with these other immunosuppressants [see Warnings and Precautions (5.2) ] . (Adalimumab label, Boxed warning)

  • CaptoprilACE inhibitorMajor

    About 13 percent of the cases of neutropenia have ended fatally, but almost all fatalities were in patients with serious illness, having collagen vascular disease, renal failure, heart failure or immunosuppressant therapy, or a combination of these complicating factors. (Captopril label, Warnings)

  • CyclosporineimmunosuppressantMajor

    In kidney, liver, and heart transplant patients Neoral may be administered with other immunosuppressive agents. (Cyclosporine label, Boxed warning)

  • FludrocortisonecorticosteroidMajor

    Chicken pox and measles, for example, can have a more serious or even fatal course in children on immunosuppressant corticosteroids. (Fludrocortisone label, Warnings)

  • Itraconazoleazole antifungalMajor

    Immunosuppressants Everolimus Sirolimus Temsirolimus (IV) Not recommended during and 2 weeks after TOLSURA treatment. (Itraconazole label, Drug interactions)

  • Nirmatrelvir and ritonavirantiviralMajor

    …methylergonovine • HMG-CoA reductase inhibitors: lovastatin, simvastatin (these drugs can be temporarily discontinued to allow PAXLOVID use [see Table 2 , Drug Interactions (7.3) ] ) • Immunosuppressants: voclosporin • Microsomal triglyceride transfer protein inhibitor: lomitapide • Migraine medications: eletriptan, ubrogepant • Mineralocorticoid receptor antagonists:… (Nirmatrelvir and ritonavir label, Contraindications)

  • TacrolimusimmunosuppressantMajor

    …IN TRANSPLANT PATIENTS; AND INCREASED MORTALITY IN FEMALE LIVER TRANSPLANT PATIENTS • Increased risk for developing serious infections and malignancies with ASTAGRAF XL ® or other immunosuppressants that may lead to hospitalization or death. [see Warnings and Precautions ( 5.1 , 5.2 )] • Increased mortality in female liver transplant patients with ASTAGRAF XL. (Tacrolimus label, Boxed warning)

  • TeriflunomideimmunosuppressantMajor

    Patients being treated with teriflunomide [see Drug Interactions (7) ] . (Leflunomide label, Contraindications)

Moderate interactions (65)

  • AbataceptimmunosuppressantModerate

    If used with concomitant methotrexate and/or other potential immunosuppressive agents, chronic monitoring should be monthly. (Leflunomide label, Warnings and precautions)

  • Allopurinolxanthine oxidase inhibitorModerate

    In patients taking ARAVA, exposure of drugs metabolized by CYP1A2 (e.g., alosetron, duloxetine, theophylline, tizanidine) may be reduced. (Leflunomide label, Drug interactions)

  • AlosetronModerate

    In patients taking ARAVA, exposure of drugs metabolized by CYP1A2 (e.g., alosetron, duloxetine, theophylline, tizanidine) may be reduced. (Leflunomide label, Drug interactions)

  • Amlodipinedihydropyridine calcium channel blockerModerate

    Immunosuppressants Amlodipine may increase the systemic exposure of cyclosporine or tacrolimus when co-administered. (Amlodipine label, Drug interactions)

  • Amoxicillinpenicillin antibioticModerate

    In patients taking ARAVA, exposure of drugs which are OAT3 substrates (e.g., cefaclor, cimetidine, ciprofloxacin, penicillin G, ketoprofen, furosemide, methotrexate, zidovudine) may be increased. (Leflunomide label, Drug interactions)

  • Amoxicillin and clavulanatepenicillin antibioticModerate

    In patients taking ARAVA, exposure of drugs which are OAT3 substrates (e.g., cefaclor, cimetidine, ciprofloxacin, penicillin G, ketoprofen, furosemide, methotrexate, zidovudine) may be increased. (Leflunomide label, Drug interactions)

  • Ampicillinpenicillin antibioticModerate

    In patients taking ARAVA, exposure of drugs which are OAT3 substrates (e.g., cefaclor, cimetidine, ciprofloxacin, penicillin G, ketoprofen, furosemide, methotrexate, zidovudine) may be increased. (Leflunomide label, Drug interactions)

  • AtorvastatinstatinModerate

    For other substrates of BCRP (e.g., mitoxantrone) and drugs in the OATP family (e.g., methotrexate, rifampin), especially HMG-Co reductase inhibitors (e.g., atorvastatin, nateglinide, pravastatin, repaglinide, and simvastatin), consider reducing the dose of these drugs and monitor patients closely for signs and symptoms of increased exposures to the drugs while… (Leflunomide label, Drug interactions)

  • AzathioprineimmunosuppressantModerate

    If used with concomitant methotrexate and/or other potential immunosuppressive agents, chronic monitoring should be monthly. (Leflunomide label, Warnings and precautions)

  • Butalbital, acetaminophen, and caffeinebarbiturateModerate

    In patients taking ARAVA, exposure of drugs metabolized by CYP1A2 (e.g., alosetron, duloxetine, theophylline, tizanidine) may be reduced. (Leflunomide label, Drug interactions)

  • CimetidineH2 blockerModerate

    In patients taking ARAVA, exposure of drugs which are OAT3 substrates (e.g., cefaclor, cimetidine, ciprofloxacin, penicillin G, ketoprofen, furosemide, methotrexate, zidovudine) may be increased. (Leflunomide label, Drug interactions)

  • CiprofloxacinfluoroquinoloneModerate

    In patients taking ARAVA, exposure of drugs which are OAT3 substrates (e.g., cefaclor, cimetidine, ciprofloxacin, penicillin G, ketoprofen, furosemide, methotrexate, zidovudine) may be increased. (Leflunomide label, Drug interactions)

  • Conjugated estrogensestrogenModerate

    Effect on Oral Contraceptives Teriflunomide may increase the systemic exposures of ethinylestradiol and levonorgestrel. (Leflunomide label, Drug interactions)

  • DenosumabModerate

    Other risk factors for the development of ONJ include immunosuppressive therapy, treatment with angiogenesis inhibitors, systemic corticosteroids, diabetes, and gingival infections. (Denosumab label, Warnings and precautions)

  • Dicloxacillinpenicillin antibioticModerate

    In patients taking ARAVA, exposure of drugs which are OAT3 substrates (e.g., cefaclor, cimetidine, ciprofloxacin, penicillin G, ketoprofen, furosemide, methotrexate, zidovudine) may be increased. (Leflunomide label, Drug interactions)

  • Dimethyl fumarateimmunosuppressantModerate

    If used with concomitant methotrexate and/or other potential immunosuppressive agents, chronic monitoring should be monthly. (Leflunomide label, Warnings and precautions)

  • Drospirenone and ethinyl estradioloral contraceptiveModerate

    Effect on Oral Contraceptives Teriflunomide may increase the systemic exposures of ethinylestradiol and levonorgestrel. (Leflunomide label, Drug interactions)

  • DuloxetineSNRIModerate

    In patients taking ARAVA, exposure of drugs metabolized by CYP1A2 (e.g., alosetron, duloxetine, theophylline, tizanidine) may be reduced. (Leflunomide label, Drug interactions)

  • EstradiolestrogenModerate

    Effect on Oral Contraceptives Teriflunomide may increase the systemic exposures of ethinylestradiol and levonorgestrel. (Leflunomide label, Drug interactions)

  • EtanerceptimmunosuppressantModerate

    If used with concomitant methotrexate and/or other potential immunosuppressive agents, chronic monitoring should be monthly. (Leflunomide label, Warnings and precautions)

  • EverolimusimmunosuppressantModerate

    If used with concomitant methotrexate and/or other potential immunosuppressive agents, chronic monitoring should be monthly. (Leflunomide label, Warnings and precautions)

  • Ezetimibe and simvastatinstatinModerate

    …(e.g., mitoxantrone) and drugs in the OATP family (e.g., methotrexate, rifampin), especially HMG-Co reductase inhibitors (e.g., atorvastatin, nateglinide, pravastatin, repaglinide, and simvastatin), consider reducing the dose of these drugs and monitor patients closely for signs and symptoms of increased exposures to the drugs while patients are taking ARAVA [see… (Leflunomide label, Drug interactions)

  • Febuxostatxanthine oxidase inhibitorModerate

    In patients taking ARAVA, exposure of drugs metabolized by CYP1A2 (e.g., alosetron, duloxetine, theophylline, tizanidine) may be reduced. (Leflunomide label, Drug interactions)

  • FenofibratefibrateModerate

    Immunosuppressants Clinical Impact: Immunosuppressants such as cyclosporine and tacrolimus can produce nephrotoxicity with decreases in creatinine clearance and rises in serum creatinine, and because renal excretion is the primary elimination route of fibrate drugs including fenofibrate, there is a risk that an interaction will lead to deterioration of renal… (Fenofibrate label, Drug interactions)

  • FingolimodimmunosuppressantModerate

    If used with concomitant methotrexate and/or other potential immunosuppressive agents, chronic monitoring should be monthly. (Leflunomide label, Warnings and precautions)

  • Furosemideloop diureticModerate

    In patients taking ARAVA, exposure of drugs which are OAT3 substrates (e.g., cefaclor, cimetidine, ciprofloxacin, penicillin G, ketoprofen, furosemide, methotrexate, zidovudine) may be increased. (Leflunomide label, Drug interactions)

  • GuselkumabimmunosuppressantModerate

    If used with concomitant methotrexate and/or other potential immunosuppressive agents, chronic monitoring should be monthly. (Leflunomide label, Warnings and precautions)

  • InfliximabimmunosuppressantModerate

    If used with concomitant methotrexate and/or other potential immunosuppressive agents, chronic monitoring should be monthly. (Leflunomide label, Warnings and precautions)

  • Ketoconazoleazole antifungalModerate

    Immunosuppressants everolimus, rapamycin (also known as sirolimus), temsirolimus budesonide, ciclesonide, cyclosporine, dexamethasone, fluticasone, methylprednisolone, tacrolimus Rapamycin (sirolimus): Ketoconazole tablets 200 mg daily for 10 days increased the C max and AUC of a single 5 mg dose of sirolimus by 4.3 fold and 10.9 fold, respectively in 23 healthy… (Ketoconazole label, Drug interactions)

  • LevonorgestrelprogestinModerate

    Teriflunomide may increase exposure of ethinylestradiol and levonorgestrel. (Leflunomide label, Drug interactions)

  • Levonorgestrel and ethinyl estradioloral contraceptiveModerate

    Teriflunomide may increase exposure of ethinylestradiol and levonorgestrel. (Leflunomide label, Drug interactions)

  • MedroxyprogesteroneprogestinModerate

    Effect on Oral Contraceptives Teriflunomide may increase the systemic exposures of ethinylestradiol and levonorgestrel. (Leflunomide label, Drug interactions)

  • MegestrolprogestinModerate

    Effect on Oral Contraceptives Teriflunomide may increase the systemic exposures of ethinylestradiol and levonorgestrel. (Leflunomide label, Drug interactions)

  • MethotrexateimmunosuppressantModerate

    If ARAVA and methotrexate are given concomitantly, follow the American College of Rheumatology (ACR) guidelines for monitoring methotrexate liver toxicity with ALT, AST, and serum albumin testing. (Leflunomide label, Warnings and precautions)

  • MycophenolateimmunosuppressantModerate

    If used with concomitant methotrexate and/or other potential immunosuppressive agents, chronic monitoring should be monthly. (Leflunomide label, Warnings and precautions)

  • NatalizumabimmunosuppressantModerate

    If used with concomitant methotrexate and/or other potential immunosuppressive agents, chronic monitoring should be monthly. (Leflunomide label, Warnings and precautions)

  • NorethindroneprogestinModerate

    Effect on Oral Contraceptives Teriflunomide may increase the systemic exposures of ethinylestradiol and levonorgestrel. (Leflunomide label, Drug interactions)

  • Norethindrone and ethinyl estradioloral contraceptiveModerate

    Effect on Oral Contraceptives Teriflunomide may increase the systemic exposures of ethinylestradiol and levonorgestrel. (Leflunomide label, Drug interactions)

  • Norgestimate and ethinyl estradioloral contraceptiveModerate

    Effect on Oral Contraceptives Teriflunomide may increase the systemic exposures of ethinylestradiol and levonorgestrel. (Leflunomide label, Drug interactions)

  • OcrelizumabimmunosuppressantModerate

    If used with concomitant methotrexate and/or other potential immunosuppressive agents, chronic monitoring should be monthly. (Leflunomide label, Warnings and precautions)

  • Penicillin Gpenicillin antibioticModerate

    In patients taking ARAVA, exposure of drugs which are OAT3 substrates (e.g., cefaclor, cimetidine, ciprofloxacin, penicillin G, ketoprofen, furosemide, methotrexate, zidovudine) may be increased. (Leflunomide label, Drug interactions)

  • Penicillin Vpenicillin antibioticModerate

    In patients taking ARAVA, exposure of drugs which are OAT3 substrates (e.g., cefaclor, cimetidine, ciprofloxacin, penicillin G, ketoprofen, furosemide, methotrexate, zidovudine) may be increased. (Leflunomide label, Drug interactions)

  • PentoxifyllinemethylxanthineModerate

    In patients taking ARAVA, exposure of drugs metabolized by CYP1A2 (e.g., alosetron, duloxetine, theophylline, tizanidine) may be reduced. (Leflunomide label, Drug interactions)

  • Pimecrolimuscalcineurin inhibitorModerate

    If used with concomitant methotrexate and/or other potential immunosuppressive agents, chronic monitoring should be monthly. (Leflunomide label, Warnings and precautions)

  • PioglitazonethiazolidinedioneModerate

    In patients taking ARAVA, exposure of drugs metabolized by CYP2C8 (e.g., paclitaxel, pioglitazone, repaglinide, rosiglitazone) may be increased. (Leflunomide label, Drug interactions)

  • Pioglitazone and metforminthiazolidinedioneModerate

    In patients taking ARAVA, exposure of drugs metabolized by CYP2C8 (e.g., paclitaxel, pioglitazone, repaglinide, rosiglitazone) may be increased. (Leflunomide label, Drug interactions)

  • PravastatinstatinModerate

    …other substrates of BCRP (e.g., mitoxantrone) and drugs in the OATP family (e.g., methotrexate, rifampin), especially HMG-Co reductase inhibitors (e.g., atorvastatin, nateglinide, pravastatin, repaglinide, and simvastatin), consider reducing the dose of these drugs and monitor patients closely for signs and symptoms of increased exposures to the drugs while patients… (Leflunomide label, Drug interactions)

  • ProgesteroneprogestinModerate

    Effect on Oral Contraceptives Teriflunomide may increase the systemic exposures of ethinylestradiol and levonorgestrel. (Leflunomide label, Drug interactions)

  • RepaglinidemeglitinideModerate

    In patients taking ARAVA, exposure of drugs metabolized by CYP2C8 (e.g., paclitaxel, pioglitazone, repaglinide, rosiglitazone) may be increased. (Leflunomide label, Drug interactions)

  • RifampinantibioticModerate

    Concomitant use of ARAVA and rifampin, a potent inducer of CYP and transporters, increased the plasma concentration of teriflunomide by 40%. (Leflunomide label, Drug interactions)

  • RitonavirantiretroviralModerate

    Immunosuppressants: cyclosporine, tacrolimus, sirolimus (rapamycin) ↑ immunosuppressants Therapeutic concentration monitoring is recommended for immunosuppressant agents when co-administered with ritonavir. (Ritonavir label, Drug interactions)

  • RituximabimmunosuppressantModerate

    If used with concomitant methotrexate and/or other potential immunosuppressive agents, chronic monitoring should be monthly. (Leflunomide label, Warnings and precautions)

  • RosuvastatinstatinModerate

    Rosuvastatin: The dose of rosuvastatin should not exceed 10 mg once daily in patients taking ARAVA. (Leflunomide label, Drug interactions)

  • SecukinumabimmunosuppressantModerate

    If used with concomitant methotrexate and/or other potential immunosuppressive agents, chronic monitoring should be monthly. (Leflunomide label, Warnings and precautions)

  • SimvastatinstatinModerate

    …(e.g., mitoxantrone) and drugs in the OATP family (e.g., methotrexate, rifampin), especially HMG-Co reductase inhibitors (e.g., atorvastatin, nateglinide, pravastatin, repaglinide, and simvastatin), consider reducing the dose of these drugs and monitor patients closely for signs and symptoms of increased exposures to the drugs while patients are taking ARAVA [see… (Leflunomide label, Drug interactions)

  • SirolimusimmunosuppressantModerate

    If used with concomitant methotrexate and/or other potential immunosuppressive agents, chronic monitoring should be monthly. (Leflunomide label, Warnings and precautions)

  • Sofosbuvir and velpatasvirantiviralModerate

    HBV reactivation has also been reported in patients receiving certain immunosuppressant or chemotherapeutic agents; the risk of HBV reactivation associated with treatment with HCV direct-acting antivirals may be increased in these patients. (Sofosbuvir and velpatasvir label, Warnings and precautions)

  • TheophyllinemethylxanthineModerate

    In patients taking ARAVA, exposure of drugs metabolized by CYP1A2 (e.g., alosetron, duloxetine, theophylline, tizanidine) may be reduced. (Leflunomide label, Drug interactions)

  • TinidazoleantibioticModerate

    Cyclosporine, tacrolimus: Monitor for toxicities of these immunosuppressive drugs ( 7.1 ) (Tinidazole label, Drug interactions)

  • Tizanidinemuscle relaxantModerate

    In patients taking ARAVA, exposure of drugs metabolized by CYP1A2 (e.g., alosetron, duloxetine, theophylline, tizanidine) may be reduced. (Leflunomide label, Drug interactions)

  • TocilizumabimmunosuppressantModerate

    If used with concomitant methotrexate and/or other potential immunosuppressive agents, chronic monitoring should be monthly. (Leflunomide label, Warnings and precautions)

  • TofacitinibimmunosuppressantModerate

    If used with concomitant methotrexate and/or other potential immunosuppressive agents, chronic monitoring should be monthly. (Leflunomide label, Warnings and precautions)

  • UpadacitinibimmunosuppressantModerate

    If used with concomitant methotrexate and/or other potential immunosuppressive agents, chronic monitoring should be monthly. (Leflunomide label, Warnings and precautions)

  • UstekinumabimmunosuppressantModerate

    If used with concomitant methotrexate and/or other potential immunosuppressive agents, chronic monitoring should be monthly. (Leflunomide label, Warnings and precautions)

  • WarfarinanticoagulantModerate

    Warfarin: Monitor INR as teriflunomide may decrease INR. (Leflunomide label, Drug interactions)

Minor mentions (14)

  • Cannabidiol (prescription)anticonvulsantMinor

    Effect on CYP2C8 Substrates Teriflunomide is an inhibitor of CYP2C8 in vivo . (Leflunomide label, Drug interactions)

  • CarbamazepineanticonvulsantMinor

    Effect on CYP1A2 Substrates Teriflunomide, the active metabolite of ARAVA, may be a weak inducer of CYP1A2 in vivo . (Leflunomide label, Drug interactions)

  • Cholestyraminebile acid sequestrantMinor

    Elimination can be accelerated by the following procedures: Administer cholestyramine 8 grams orally 3 times daily for 11 days. (Leflunomide label, Warnings and precautions)

  • Deferasiroxiron supplementMinor

    Effect on CYP2C8 Substrates Teriflunomide is an inhibitor of CYP2C8 in vivo . (Leflunomide label, Drug interactions)

  • FluvastatinstatinMinor

    IMNM is characterized by proximal muscle weakness and elevated serum CK, which persist despite discontinuation of statin treatment; positive anti-HMG CoA reductase antibody, muscle biopsy showing necrotizing myopathy, and improvement with immunosuppressive agents. (Fluvastatin label, Warnings and precautions)

  • GemfibrozilfibrateMinor

    Effect on CYP2C8 Substrates Teriflunomide is an inhibitor of CYP2C8 in vivo . (Leflunomide label, Drug interactions)

  • LovastatinstatinMinor

    IMNM is characterized by: proximal muscle weakness and elevated serum creatine kinase, which persist despite discontinuation of statin treatment; positive anti-HMG CoA reductase antibody; muscle biopsy showing necrotizing myopathy; and improvement with immunosuppressive agents. (Lovastatin label, Warnings)

  • Methimazoleantithyroid drugMinor

    In some cases, vasculitis resolved/improved with drug discontinuation; however, more severe cases required treatment with additional measures including corticosteroids, immunosuppressant therapy, and plasmapheresis. (Methimazole label, Warnings)

  • PerampanelanticonvulsantMinor

    Effect on CYP2C8 Substrates Teriflunomide is an inhibitor of CYP2C8 in vivo . (Leflunomide label, Drug interactions)

  • PitavastatinstatinMinor

    IMNM is characterized by proximal muscle weakness and elevated serum creatine kinase that persist despite discontinuation of statin treatment; positive anti-HMG CoA reductase antibody; muscle biopsy showing necrotizing myopathy; and improvement with immunosuppressive agents. (Pitavastatin label, Warnings and precautions)

  • Posaconazoleazole antifungalMinor

    CYP3A Substrates Immunosuppressants that are CYP3A4 Substrates Mechanism and Clinical Effect(s) Posaconazole is a strong CYP3A4 inhibitor. (Posaconazole label, Drug interactions)

  • Propylthiouracilantithyroid drugMinor

    In some cases, vasculitis resolved/improved with drug discontinuation; however, more severe cases required treatment with additional measures including corticosteroids, immunosuppressant therapy, and plasmapheresis. (Propylthiouracil label, Warnings)

  • Sulfamethoxazole and trimethoprimsulfonamideMinor

    Effect on CYP2C8 Substrates Teriflunomide is an inhibitor of CYP2C8 in vivo . (Leflunomide label, Drug interactions)

  • TrimethoprimantibioticMinor

    Effect on CYP2C8 Substrates Teriflunomide is an inhibitor of CYP2C8 in vivo . (Leflunomide label, Drug interactions)

No significant interaction reported (1)

  • Clarithromycinmacrolide antibioticNo interaction

    …Repaglinide, Rosiglitazone: [See Warnings and Precautions ( 5.4 ) and Adverse Reactions ( 6.2 )] Insulin Insulin: [See Warnings and Precautions ( 5.4 ) and Adverse Reactions ( 6.2 )] Immunosuppressants: Cyclosporine Use With Caution Cyclosporine: There have been spontaneous or published reports of CYP3A based interactions of clarithromycin with cyclosporine. (Clarithromycin label, Drug interactions)

Check Leflunomide against everything you take. Add your full list; every pair is checked at once.

Open in the checker

Not medical advice. Severity reflects the label's wording, not your circumstances. A "major" flag can be routine under supervision and a "minor" one can matter at high doses. Ask a pharmacist.