Interaction Checker

Erlotinib interactions

Erlotinib (Tarceva) has 150 documented interactions across the FDA labels and fact sheets we index: 61 major, 88 moderate, 1 minor, and 0 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.

Interactions from the label

Major interactions (61)

  • AmiodaroneantiarrhythmicMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • AprepitantCYP3A4 inhibitorMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • AtazanavirantiretroviralMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • Cannabidiol (prescription)anticonvulsantMajor

    Reduce the erlotinib dosage when co-administering with a strong CYP3A4 inhibitor or a combined CYP3A4 and CYP1A2 inhibitor if co-administration is unavoidable [see Dosage and Administration (2.4) ]. (Erlotinib label, Drug interactions)

  • CarbamazepineanticonvulsantMajor

    Avoid smoking tobacco (CYP1A2 inducer) and avoid concomitant use of erlotinib with moderate CYP1A2 inducers (e.g., teriflunomide, rifampin, or phenytoin). (Erlotinib label, Drug interactions)

  • CenobamateanticonvulsantMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • CimetidineH2 blockerMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • CiprofloxacinfluoroquinoloneMajor

    Reduce the erlotinib dosage when co-administering with a strong CYP3A4 inhibitor or a combined CYP3A4 and CYP1A2 inhibitor if co-administration is unavoidable [see Dosage and Administration (2.4) ]. (Erlotinib label, Drug interactions)

  • Clarithromycinmacrolide antibioticMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • CyclosporineimmunosuppressantMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • DarunavirantiretroviralMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • Darunavir and cobicistatantiretroviralMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • Deferasiroxiron supplementMajor

    Reduce the erlotinib dosage when co-administering with a strong CYP3A4 inhibitor or a combined CYP3A4 and CYP1A2 inhibitor if co-administration is unavoidable [see Dosage and Administration (2.4) ]. (Erlotinib label, Drug interactions)

  • Dexlansoprazoleproton pump inhibitorMajor

    For proton pump inhibitors, avoid concomitant use if possible. (Erlotinib label, Drug interactions)

  • Diltiazemcalcium channel blockerMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • DronedaroneantiarrhythmicMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • EfavirenzantiretroviralMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • Efavirenz, lamivudine, and tenofovirantiretroviralMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • Elvitegravir, cobicistat, emtricitabine, and tenofovirantiretroviralMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • Erythromycinmacrolide antibioticMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • Esomeprazoleproton pump inhibitorMajor

    For proton pump inhibitors, avoid concomitant use if possible. (Erlotinib label, Drug interactions)

  • EverolimusimmunosuppressantMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • Fluconazoleazole antifungalMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • FluvoxamineSSRIMajor

    Reduce the erlotinib dosage when co-administering with a strong CYP3A4 inhibitor or a combined CYP3A4 and CYP1A2 inhibitor if co-administration is unavoidable [see Dosage and Administration (2.4) ]. (Erlotinib label, Drug interactions)

  • FosamprenavirantiretroviralMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • FosaprepitantCYP3A4 inhibitorMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • GrapefruitFood and drinkMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • ImatinibCYP3A4 inhibitorMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • IsoniazidantibioticMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • Itraconazoleazole antifungalMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • IvacaftorCYP3A4 inhibitorMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • Ketoconazoleazole antifungalMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • Lansoprazoleproton pump inhibitorMajor

    For proton pump inhibitors, avoid concomitant use if possible. (Erlotinib label, Drug interactions)

  • LenacapavirantiretroviralMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • Lopinavir and ritonavirantiretroviralMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • MexiletineantiarrhythmicMajor

    Reduce the erlotinib dosage when co-administering with a strong CYP3A4 inhibitor or a combined CYP3A4 and CYP1A2 inhibitor if co-administration is unavoidable [see Dosage and Administration (2.4) ]. (Erlotinib label, Drug interactions)

  • MifepristoneCYP3A4 inhibitorMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • Mirabegronbeta-adrenergic agonistMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • Naproxen and esomeprazoleNSAIDMajor

    For proton pump inhibitors, avoid concomitant use if possible. (Erlotinib label, Drug interactions)

  • NefazodoneantidepressantMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • Nirmatrelvir and ritonavirantiviralMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • Omeprazoleproton pump inhibitorMajor

    For proton pump inhibitors, avoid concomitant use if possible. (Erlotinib label, Drug interactions)

  • Omeprazole and sodium bicarbonateproton pump inhibitorMajor

    For proton pump inhibitors, avoid concomitant use if possible. (Erlotinib label, Drug interactions)

  • PalbociclibCYP3A4 inhibitorMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • Pantoprazoleproton pump inhibitorMajor

    For proton pump inhibitors, avoid concomitant use if possible. (Erlotinib label, Drug interactions)

  • PerampanelanticonvulsantMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • PhenytoinanticonvulsantMajor

    Avoid smoking tobacco (CYP1A2 inducer) and avoid concomitant use of erlotinib with moderate CYP1A2 inducers (e.g., teriflunomide, rifampin, or phenytoin). (Erlotinib label, Drug interactions)

  • Posaconazoleazole antifungalMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • Rabeprazoleproton pump inhibitorMajor

    For proton pump inhibitors, avoid concomitant use if possible. (Erlotinib label, Drug interactions)

  • RanolazineQT-prolonging drugMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • RifampinantibioticMajor

    Avoid smoking tobacco (CYP1A2 inducer) and avoid concomitant use of erlotinib with moderate CYP1A2 inducers (e.g., teriflunomide, rifampin, or phenytoin). (Erlotinib label, Drug interactions)

  • RitonavirantiretroviralMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • Suvorexantsedative-hypnoticMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • TeriflunomideimmunosuppressantMajor

    Avoid smoking tobacco (CYP1A2 inducer) and avoid concomitant use of erlotinib with moderate CYP1A2 inducers (e.g., teriflunomide, rifampin, or phenytoin). (Erlotinib label, Drug interactions)

  • Ticagrelorantiplatelet agentMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • Tobacco and smokingTobacco and cannabisMajor

    Avoid smoking tobacco (CYP1A2 inducer) and avoid concomitant use of erlotinib with moderate CYP1A2 inducers (e.g., teriflunomide, rifampin, or phenytoin). (Erlotinib label, Drug interactions)

  • Verapamilcalcium channel blockerMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • Viloxazinenorepinephrine reuptake inhibitorMajor

    Reduce the erlotinib dosage when co-administering with a strong CYP3A4 inhibitor or a combined CYP3A4 and CYP1A2 inhibitor if co-administration is unavoidable [see Dosage and Administration (2.4) ]. (Erlotinib label, Drug interactions)

  • Voriconazoleazole antifungalMajor

    Avoid co-administering erlotinib with strong CYP3A4 inhibitors (e.g., boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telithromycin, voriconazole, grapefruit or grapefruit juice) or a combined CYP3A4 and CYP1A2 inhibitor (e.g., ciprofloxacin). (Erlotinib label, Drug interactions)

  • WarfarinanticoagulantMajor

    Hemorrhage in Patients Taking Warfarin Severe and fatal hemorrhage associated with International Normalized Ratio (INR) elevations can occur when erlotinib and warfarin are administered concurrently. (Erlotinib label, Warnings and precautions)

  • ZileutonCYP1A2 inhibitorMajor

    Reduce the erlotinib dosage when co-administering with a strong CYP3A4 inhibitor or a combined CYP3A4 and CYP1A2 inhibitor if co-administration is unavoidable [see Dosage and Administration (2.4) ]. (Erlotinib label, Drug interactions)

Moderate interactions (88)

  • Acetaminophen and ibuprofenNSAIDModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • Antacids (Tums, Maalox, Mylanta)OTC productModerate

    For H-2 receptor antagonists and antacids, modify the dosing schedule [see Dosage and Administration (2.4) ]. (Erlotinib label, Drug interactions)

  • ApixabananticoagulantModerate

    • Hemorrhage in patients taking warfarin: Regularly monitor INR in patients taking warfarin or other coumarin-derivative anticoagulants. (Erlotinib label, Warnings and precautions)

  • ArgatrobananticoagulantModerate

    • Hemorrhage in patients taking warfarin: Regularly monitor INR in patients taking warfarin or other coumarin-derivative anticoagulants. (Erlotinib label, Warnings and precautions)

  • ArmodafinilCNS stimulantModerate

    CYP3A4 Inducers Pre-treatment with a CYP3A4 inducer prior to erlotinib decreased erlotinib exposure [see Clinical Pharmacology (12.3) ]. (Erlotinib label, Drug interactions)

  • AspirinNSAIDModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • Aspirin and dipyridamoleantiplatelet agentModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • Azelastine and fluticasoneantihistamineModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • BeclomethasonecorticosteroidModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • BetamethasonecorticosteroidModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • BivalirudinanticoagulantModerate

    • Hemorrhage in patients taking warfarin: Regularly monitor INR in patients taking warfarin or other coumarin-derivative anticoagulants. (Erlotinib label, Warnings and precautions)

  • BosentanCYP3A4 inducerModerate

    CYP3A4 Inducers Pre-treatment with a CYP3A4 inducer prior to erlotinib decreased erlotinib exposure [see Clinical Pharmacology (12.3) ]. (Erlotinib label, Drug interactions)

  • BudesonidecorticosteroidModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • Budesonide and formoterolcorticosteroidModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • Butalbital, aspirin, and caffeinebarbiturateModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • Butalbital, aspirin, caffeine, and codeinebarbiturateModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • CelecoxibNSAIDModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • CiclesonidecorticosteroidModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • ClobazambenzodiazepineModerate

    CYP3A4 Inducers Pre-treatment with a CYP3A4 inducer prior to erlotinib decreased erlotinib exposure [see Clinical Pharmacology (12.3) ]. (Erlotinib label, Drug interactions)

  • ClobetasolcorticosteroidModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • DabigatrananticoagulantModerate

    • Hemorrhage in patients taking warfarin: Regularly monitor INR in patients taking warfarin or other coumarin-derivative anticoagulants. (Erlotinib label, Warnings and precautions)

  • DeflazacortcorticosteroidModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • DesonidecorticosteroidModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • DexamethasonecorticosteroidModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • DiclofenacNSAIDModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • Diclofenac and misoprostolNSAIDModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • DiflunisalNSAIDModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • EdoxabananticoagulantModerate

    • Hemorrhage in patients taking warfarin: Regularly monitor INR in patients taking warfarin or other coumarin-derivative anticoagulants. (Erlotinib label, Warnings and precautions)

  • EnoxaparinanticoagulantModerate

    • Hemorrhage in patients taking warfarin: Regularly monitor INR in patients taking warfarin or other coumarin-derivative anticoagulants. (Erlotinib label, Warnings and precautions)

  • EslicarbazepineanticonvulsantModerate

    CYP3A4 Inducers Pre-treatment with a CYP3A4 inducer prior to erlotinib decreased erlotinib exposure [see Clinical Pharmacology (12.3) ]. (Erlotinib label, Drug interactions)

  • EtodolacNSAIDModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • EtravirineantiretroviralModerate

    CYP3A4 Inducers Pre-treatment with a CYP3A4 inducer prior to erlotinib decreased erlotinib exposure [see Clinical Pharmacology (12.3) ]. (Erlotinib label, Drug interactions)

  • FamotidineH2 blockerModerate

    Drugs the Increase Gastric pH Co-administration of erlotinib with proton pump inhibitors (e.g., omeprazole) and H-2 receptor antagonists (e.g., ranitidine) decreased erlotinib exposure [see Clinical Pharmacology (12.3) ]. (Erlotinib label, Drug interactions)

  • FenoprofenNSAIDModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • FludrocortisonecorticosteroidModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • FlunisolidecorticosteroidModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • FluocinonidecorticosteroidModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • FlurbiprofenNSAIDModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • FluticasonecorticosteroidModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • Fluticasone and salmeterolcorticosteroidModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • FondaparinuxanticoagulantModerate

    • Hemorrhage in patients taking warfarin: Regularly monitor INR in patients taking warfarin or other coumarin-derivative anticoagulants. (Erlotinib label, Warnings and precautions)

  • FosphenytoinanticonvulsantModerate

    CYP3A4 Inducers Pre-treatment with a CYP3A4 inducer prior to erlotinib decreased erlotinib exposure [see Clinical Pharmacology (12.3) ]. (Erlotinib label, Drug interactions)

  • GriseofulvinantifungalModerate

    CYP3A4 Inducers Pre-treatment with a CYP3A4 inducer prior to erlotinib decreased erlotinib exposure [see Clinical Pharmacology (12.3) ]. (Erlotinib label, Drug interactions)

  • HalobetasolcorticosteroidModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • HeparinanticoagulantModerate

    • Hemorrhage in patients taking warfarin: Regularly monitor INR in patients taking warfarin or other coumarin-derivative anticoagulants. (Erlotinib label, Warnings and precautions)

  • Hydrocodone and ibuprofenopioidModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • HydrocortisonecorticosteroidModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • IbuprofenNSAIDModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • Ibuprofen and famotidineNSAIDModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • IndomethacinNSAIDModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • KetoprofenNSAIDModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • KetorolacNSAIDModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • LorlatinibCYP3A4 inducerModerate

    CYP3A4 Inducers Pre-treatment with a CYP3A4 inducer prior to erlotinib decreased erlotinib exposure [see Clinical Pharmacology (12.3) ]. (Erlotinib label, Drug interactions)

  • Mefenamic acidNSAIDModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • MeloxicamNSAIDModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • MethylprednisolonecorticosteroidModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • MitapivatCYP3A4 inducerModerate

    CYP3A4 Inducers Pre-treatment with a CYP3A4 inducer prior to erlotinib decreased erlotinib exposure [see Clinical Pharmacology (12.3) ]. (Erlotinib label, Drug interactions)

  • MitotaneCYP3A4 inducerModerate

    CYP3A4 Inducers Pre-treatment with a CYP3A4 inducer prior to erlotinib decreased erlotinib exposure [see Clinical Pharmacology (12.3) ]. (Erlotinib label, Drug interactions)

  • ModafinilCNS stimulantModerate

    CYP3A4 Inducers Pre-treatment with a CYP3A4 inducer prior to erlotinib decreased erlotinib exposure [see Clinical Pharmacology (12.3) ]. (Erlotinib label, Drug interactions)

  • MometasonecorticosteroidModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • NabumetoneNSAIDModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • Nafcillinpenicillin antibioticModerate

    CYP3A4 Inducers Pre-treatment with a CYP3A4 inducer prior to erlotinib decreased erlotinib exposure [see Clinical Pharmacology (12.3) ]. (Erlotinib label, Drug interactions)

  • NaproxenNSAIDModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • NevirapineantiretroviralModerate

    CYP3A4 Inducers Pre-treatment with a CYP3A4 inducer prior to erlotinib decreased erlotinib exposure [see Clinical Pharmacology (12.3) ]. (Erlotinib label, Drug interactions)

  • NizatidineH2 blockerModerate

    Drugs the Increase Gastric pH Co-administration of erlotinib with proton pump inhibitors (e.g., omeprazole) and H-2 receptor antagonists (e.g., ranitidine) decreased erlotinib exposure [see Clinical Pharmacology (12.3) ]. (Erlotinib label, Drug interactions)

  • Olopatadine and mometasoneantihistamineModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • Orphenadrine, aspirin, and caffeinemuscle relaxantModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • OxaprozinNSAIDModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • OxcarbazepineanticonvulsantModerate

    CYP3A4 Inducers Pre-treatment with a CYP3A4 inducer prior to erlotinib decreased erlotinib exposure [see Clinical Pharmacology (12.3) ]. (Erlotinib label, Drug interactions)

  • PhenobarbitalbarbiturateModerate

    CYP3A4 Inducers Pre-treatment with a CYP3A4 inducer prior to erlotinib decreased erlotinib exposure [see Clinical Pharmacology (12.3) ]. (Erlotinib label, Drug interactions)

  • Phenobarbital, hyoscyamine, atropine, and scopolaminebarbiturateModerate

    Increase the erlotinib dosage if co-administration with CYP3A4 inducers (e.g., carbamazepine, phenytoin, rifampin, rifabutin, rifapentine, phenobarbital and St. (Erlotinib label, Drug interactions)

  • Phentermine and topiramateCNS stimulantModerate

    CYP3A4 Inducers Pre-treatment with a CYP3A4 inducer prior to erlotinib decreased erlotinib exposure [see Clinical Pharmacology (12.3) ]. (Erlotinib label, Drug interactions)

  • PiroxicamNSAIDModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • PrednisolonecorticosteroidModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • PrednisonecorticosteroidModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • PrimidoneanticonvulsantModerate

    CYP3A4 Inducers Pre-treatment with a CYP3A4 inducer prior to erlotinib decreased erlotinib exposure [see Clinical Pharmacology (12.3) ]. (Erlotinib label, Drug interactions)

  • RanitidineH2 blockerModerate

    Drugs the Increase Gastric pH Co-administration of erlotinib with proton pump inhibitors (e.g., omeprazole) and H-2 receptor antagonists (e.g., ranitidine) decreased erlotinib exposure [see Clinical Pharmacology (12.3) ]. (Erlotinib label, Drug interactions)

  • RifabutinantibioticModerate

    CYP3A4 Inducers Pre-treatment with a CYP3A4 inducer prior to erlotinib decreased erlotinib exposure [see Clinical Pharmacology (12.3) ]. (Erlotinib label, Drug interactions)

  • RifapentineantibioticModerate

    CYP3A4 Inducers Pre-treatment with a CYP3A4 inducer prior to erlotinib decreased erlotinib exposure [see Clinical Pharmacology (12.3) ]. (Erlotinib label, Drug interactions)

  • RivaroxabananticoagulantModerate

    • Hemorrhage in patients taking warfarin: Regularly monitor INR in patients taking warfarin or other coumarin-derivative anticoagulants. (Erlotinib label, Warnings and precautions)

  • SalsalateNSAIDModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • Sodium bicarbonateantacidModerate

    For H-2 receptor antagonists and antacids, modify the dosing schedule [see Dosage and Administration (2.4) ]. (Erlotinib label, Drug interactions)

  • SulindacNSAIDModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • Sumatriptan and naproxentriptanModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • SuzetrigineCYP3A4 inducerModerate

    CYP3A4 Inducers Pre-treatment with a CYP3A4 inducer prior to erlotinib decreased erlotinib exposure [see Clinical Pharmacology (12.3) ]. (Erlotinib label, Drug interactions)

  • TolmetinNSAIDModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

  • TopiramateanticonvulsantModerate

    CYP3A4 Inducers Pre-treatment with a CYP3A4 inducer prior to erlotinib decreased erlotinib exposure [see Clinical Pharmacology (12.3) ]. (Erlotinib label, Drug interactions)

  • TriamcinolonecorticosteroidModerate

    Patients receiving concomitant anti-angiogenic agents, corticosteroids, NSAIDs, or taxane-based chemotherapy, or who have prior history of peptic ulceration or diverticular disease may be at increased risk of perforation [see Adverse Reactions (6.1 , 6.2) ]. (Erlotinib label, Warnings and precautions)

Minor mentions (1)

  • GemcitabineantimetaboliteMinor

    The incidence of renal impairment in the pancreatic cancer study was 1.4% in the erlotinib plus gemcitabine arm and 0.4% in the control arm. (Erlotinib label, Warnings and precautions)

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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.