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