The serum concentration of Montelukast can be increased when it is combined with Ivacaftor. The metabolism of Montelukast can be decreased when combined with Darunavir. The metabolism of Montelukast can be decreased when combined with Capecitabine. The metabolism of Montelukast can be decreased when combined with Lobeglitazone. The metabolism of Montelukast can be decreased when combined with Olaparib. The serum concentration of Montelukast can be increased when it is combined with Gemfibrozil. The serum concentration of Montelukast can be decreased when it is combined with Tocilizumab. The metabolism of Montelukast can be decreased when combined with Atazanavir. The serum concentration of Montelukast can be decreased when it is combined with Siltuximab. The metabolism of Montelukast can be decreased when combined with Fosamprenavir. The metabolism of Montelukast can be decreased when combined with Venlafaxine. The metabolism of Montelukast can be decreased when combined with Sulfamethoxazole. The metabolism of Montelukast can be decreased when combined with Etravirine. The metabolism of Montelukast can be decreased when combined with Saquinavir. The serum concentration of Montelukast can be increased when it is combined with Palbociclib. The metabolism of Montelukast can be decreased when combined with Dosulepin. The serum concentration of Conivaptan can be increased when it is combined with Montelukast. The therapeutic efficacy of Montelukast can be decreased when used in combination with Amoxapine. The metabolism of Montelukast can be decreased when combined with Topiroxostat. The metabolism of Montelukast can be decreased when combined with Nelfinavir. The metabolism of Montelukast can be decreased when combined with Abiraterone. The metabolism of Montelukast can be decreased when combined with Clotrimazole. The metabolism of Montelukast can be increased when combined with Rifabutin. The metabolism of Montelukast can be decreased when combined with Dronedarone. The metabolism of Montelukast can be decreased when combined with Fluconazole. The metabolism of Montelukast can be decreased when combined with Telaprevir. The metabolism of Montelukast can be increased when combined with Nevirapine. The metabolism of Montelukast can be decreased when combined with Erythromycin. The metabolism of Montelukast can be decreased when combined with Isavuconazonium. The metabolism of Montelukast can be decreased when combined with Itraconazole. The metabolism of Montelukast can be decreased when combined with Imatinib. The metabolism of Montelukast can be decreased when combined with Ticagrelor. The serum concentration of Montelukast can be increased when it is combined with Osimertinib. The metabolism of Montelukast can be decreased when combined with Nicotine. The metabolism of Montelukast can be decreased when combined with Rucaparib. The metabolism of Montelukast can be decreased when combined with Ticlopidine. The metabolism of Montelukast can be decreased when combined with Diltiazem. The metabolism of Montelukast can be decreased when combined with Sulfisoxazole. The metabolism of Montelukast can be decreased when combined with Cyclosporine. The metabolism of Montelukast can be decreased when combined with Telithromycin. The serum concentration of Montelukast can be decreased when it is combined with St. John's Wort. The metabolism of Montelukast can be increased when combined with Phenytoin. The metabolism of Montelukast can be increased when combined with Fosphenytoin. The metabolism of Montelukast can be decreased when combined with Crisaborole. The metabolism of Montelukast can be decreased when combined with Losartan. The metabolism of Montelukast can be decreased when combined with Delavirdine. The metabolism of Montelukast can be decreased when combined with Posaconazole. The serum concentration of Montelukast can be increased when it is combined with Ceritinib. The serum concentration of Montelukast can be increased when it is combined with Fosaprepitant. The therapeutic efficacy of Montelukast can be decreased when used in combination with Sarilumab. The metabolism of Montelukast can be decreased when combined with Atomoxetine. The metabolism of Montelukast can be decreased when combined with Nefazodone. The metabolism of Montelukast can be decreased when combined with Crizotinib. The serum concentration of Montelukast can be increased when it is combined with Mifepristone. The serum concentration of Montelukast can be decreased when it is combined with Mitotane. The metabolism of Montelukast can be decreased when combined with Efavirenz. The metabolism of Montelukast can be decreased when combined with Sildenafil. The metabolism of Montelukast can be decreased when combined with Irbesartan. The metabolism of Montelukast can be decreased when combined with Leflunomide. The metabolism of Montelukast can be decreased when combined with Cholecalciferol. The metabolism of Montelukast can be decreased when combined with Amiodarone. The metabolism of Montelukast can be decreased when combined with Sorafenib. The metabolism of Montelukast can be decreased when combined with Fluvastatin. The metabolism of Montelukast can be decreased when combined with Valsartan. The metabolism of Montelukast can be decreased when combined with Ketoconazole. The metabolism of Montelukast can be decreased when combined with Ziprasidone. The metabolism of Montelukast can be decreased when combined with Lopinavir. The metabolism of Montelukast can be decreased when combined with Bortezomib. The serum concentration of Montelukast can be decreased when it is combined with Bosentan. The metabolism of Montelukast can be decreased when combined with Tolbutamide. The metabolism of Montelukast can be decreased when combined with Fluorouracil. The serum concentration of Montelukast can be decreased when it is combined with Dabrafenib. The metabolism of Montelukast can be decreased when combined with Nicardipine. The metabolism of Montelukast can be decreased when combined with Valproic Acid. The metabolism of Montelukast can be decreased when combined with Idelalisib. The metabolism of Montelukast can be decreased when combined with Quinine. The metabolism of Montelukast can be increased when combined with Secobarbital. The metabolism of Montelukast can be decreased when combined with Sulfadiazine. The metabolism of Montelukast can be increased when combined with Primidone. The metabolism of Montelukast can be decreased when combined with Zafirlukast. The metabolism of Montelukast can be increased when combined with Rifapentine. The metabolism of Montelukast can be decreased when combined with Voriconazole. The serum concentration of Montelukast can be increased when it is combined with Fusidic Acid. The metabolism of Montelukast can be decreased when combined with Trimethoprim. The metabolism of Montelukast can be decreased when combined with Lovastatin. The metabolism of Montelukast can be decreased when combined with Pyrimethamine. The metabolism of Montelukast can be decreased when combined with Floxuridine. The serum concentration of Montelukast can be increased when it is combined with Aprepitant. The serum concentration of Montelukast can be decreased when it is combined with Vemurafenib. The metabolism of Montelukast can be decreased when combined with Nilotinib. The metabolism of Montelukast can be increased when combined with Pentobarbital. The serum concentration of Montelukast can be decreased when it is combined with Enzalutamide. The serum concentration of Montelukast can be increased when it is combined with Luliconazole. The metabolism of Montelukast can be decreased when combined with Manidipine. The metabolism of Montelukast can be decreased when combined with Doxycycline. The metabolism of Montelukast can be decreased when combined with Verapamil. The metabolism of Montelukast can be decreased when combined with Indinavir. The metabolism of Montelukast can be decreased when combined with Fluvoxamine. The metabolism of Montelukast can be decreased when combined with Clarithromycin. The metabolism of Montelukast can be decreased when combined with Ranolazine. The metabolism of Montelukast can be decreased when combined with Cobicistat. The serum concentration of Montelukast can be increased when it is combined with Stiripentol. The serum concentration of Montelukast can be increased when it is combined with Simeprevir. The serum concentration of Amodiaquine can be increased when it is combined with Montelukast. The metabolism of Montelukast can be increased when combined with Phenobarbital. The serum concentration of Montelukast can be increased when it is combined with Dasatinib. The metabolism of Montelukast can be decreased when combined with Midostaurin. The metabolism of Montelukast can be increased when combined with Carbamazepine. The metabolism of Montelukast can be decreased when combined with Omeprazole. The metabolism of Montelukast can be increased when combined with Rifampicin. The serum concentration of Montelukast can be decreased when it is combined with Lumacaftor. The metabolism of Montelukast can be decreased when combined with Dihydroergotamine. The metabolism of Montelukast can be decreased when combined with Isradipine. The serum concentration of Montelukast can be decreased when it is combined with Deferasirox. The serum concentration of Montelukast can be increased when it is combined with Netupitant. The metabolism of Montelukast can be decreased when combined with Clemastine. The metabolism of Montelukast can be decreased when combined with Boceprevir.