The serum concentration of Theophylline can be decreased when it is combined with Adalimumab. The metabolism of Naproxen can be decreased when combined with Theophylline. The serum concentration of Theophylline can be increased when it is combined with Osimertinib. The therapeutic efficacy of Lormetazepam can be decreased when used in combination with Theophylline. The serum concentration of Theophylline can be increased when it is combined with Aprepitant. The metabolism of Theophylline can be decreased when combined with Interferon alfa-n3. The serum concentration of Theophylline can be decreased when it is combined with Nitroaspirin. The therapeutic efficacy of Adenosine can be decreased when used in combination with Theophylline. The metabolism of Theophylline can be decreased when combined with Sulfisoxazole. The serum concentration of Theophylline can be decreased when it is combined with Trandolapril. The metabolism of Theophylline can be decreased when combined with Indinavir. The metabolism of Theophylline can be decreased when combined with Nelfinavir. The metabolism of Theophylline can be decreased when combined with Dihydroergotamine. Alprenolol may decrease the bronchodilatory activities of Theophylline. The metabolism of Theophylline can be decreased when combined with Cyclosporine. The serum concentration of Theophylline can be decreased when it is combined with Chymostatin. The therapeutic efficacy of Bromazepam can be decreased when used in combination with Theophylline. The metabolism of Praziquantel can be decreased when combined with Theophylline. The metabolism of Theophylline can be decreased when combined with Flumequine. The metabolism of Theophylline can be decreased when combined with Amiodarone. The metabolism of Theophylline can be decreased when combined with Dosulepin. The serum concentration of Theophylline can be increased when it is combined with Pentoxifylline. The metabolism of Theophylline can be decreased when combined with Atomoxetine. The serum concentration of Agomelatine can be increased when it is combined with Theophylline. The serum concentration of Theophylline can be increased when it is combined with Fosaprepitant. The serum concentration of Theophylline can be decreased when it is combined with Perindopril. The metabolism of Theophylline can be decreased when combined with Thiabendazole. The metabolism of Theophylline can be decreased when combined with Lovastatin. The serum concentration of Theophylline can be decreased when it is combined with Candoxatrilat. The serum concentration of Theophylline can be decreased when it is combined with Dabrafenib. The serum concentration of Theophylline can be decreased when it is combined with Benzamidine. The metabolism of Tamoxifen can be decreased when combined with Theophylline. The metabolism of Anagrelide can be decreased when combined with Theophylline. The metabolism of Theophylline can be decreased when combined with Manidipine. The metabolism of Theophylline can be decreased when combined with Nilotinib. The metabolism of Theophylline can be increased when combined with Liotrix. The metabolism of Dinoprostone can be decreased when combined with Theophylline. The metabolism of Primaquine can be decreased when combined with Theophylline. The serum concentration of Theophylline can be decreased when it is combined with GM6001. The serum concentration of Theophylline can be increased when it is combined with Panobinostat. The metabolism of Ergotamine can be decreased when combined with Theophylline. The serum concentration of Theophylline can be decreased when it is combined with Barbital. The metabolism of Theophylline can be decreased when combined with Itraconazole. The metabolism of Theophylline can be decreased when combined with Interferon beta-1b. The metabolism of Theophylline can be decreased when combined with Losartan. The metabolism of Ranitidine can be decreased when combined with Theophylline. The serum concentration of Theophylline can be decreased when it is combined with Ramipril. The therapeutic efficacy of Oxazepam can be decreased when used in combination with Theophylline. The metabolism of Theophylline can be decreased when combined with Fluconazole. The metabolism of Theophylline can be decreased when combined with Pefloxacin. The metabolism of Theophylline can be decreased when combined with Boceprevir. The therapeutic efficacy of Lorazepam can be decreased when used in combination with Theophylline. The serum concentration of Lithium can be decreased when it is combined with Theophylline. The serum concentration of Theophylline can be decreased when it is combined with 4-(2-Aminoethyl)Benzenesulfonyl Fluoride. The metabolism of Pentamidine can be decreased when combined with Theophylline. The serum concentration of Theophylline can be increased when it is combined with Propafenone. The serum concentration of Theophylline can be decreased when it is combined with 1,10-Phenanthroline. The serum concentration of Theophylline can be increased when it is combined with Equol. The serum concentration of Theophylline can be decreased when it is combined with Methylphenobarbital. The serum concentration of Theophylline can be decreased when it is combined with Candoxatril. The metabolism of Ixazomib can be decreased when combined with Theophylline. The therapeutic efficacy of Delorazepam can be decreased when used in combination with Theophylline. The therapeutic efficacy of Quazepam can be decreased when used in combination with Theophylline. The serum concentration of Theophylline can be decreased when it is combined with Lisinopril. The metabolism of Haloperidol can be decreased when combined with Theophylline. The metabolism of Tolperisone can be decreased when combined with Theophylline. The serum concentration of Theophylline can be decreased when it is combined with Temocapril. The serum concentration of Theophylline can be decreased when it is combined with Moexipril. The serum concentration of Theophylline can be decreased when it is combined with Sivelestat. The serum concentration of Theophylline can be increased when it is combined with Carbimazole. The serum concentration of Theophylline can be decreased when it is combined with Metreleptin. The metabolism of Theophylline can be decreased when combined with Lumefantrine. The metabolism of Theophylline can be decreased when combined with Gemfibrozil. The serum concentration of Zafirlukast can be decreased when it is combined with Theophylline. The metabolism of Theophylline can be decreased when combined with Solithromycin. The metabolism of Theophylline can be decreased when combined with Tolbutamide. The metabolism of Theophylline can be decreased when combined with Artemether. The risk or severity of adverse effects can be increased when Theophylline is combined with Formoterol. The metabolism of Levobupivacaine can be decreased when combined with Theophylline. Esmolol may decrease the bronchodilatory activities of Theophylline. The therapeutic efficacy of Temazepam can be decreased when used in combination with Theophylline. The serum concentration of Theophylline can be decreased when it is combined with Letaxaban. The serum concentration of Theophylline can be decreased when it is combined with Tocilizumab. The metabolism of Theophylline can be decreased when combined with Metoprolol. The metabolism of Chlorzoxazone can be decreased when combined with Theophylline. The serum concentration of Theophylline can be decreased when it is combined with Captopril. The serum concentration of Theophylline can be decreased when it is combined with Thiorphan. The metabolism of Theophylline can be decreased when combined with Rolapitant. The metabolism of Doxepin can be decreased when combined with Theophylline. The metabolism of Proguanil can be decreased when combined with Theophylline. The metabolism of Thalidomide can be decreased when combined with Theophylline. The metabolism of Methoxyflurane can be decreased when combined with Theophylline. The therapeutic efficacy of Clorazepate can be decreased when used in combination with Theophylline. The metabolism of Theophylline can be decreased when combined with Idelalisib. The metabolism of Theophylline can be decreased when combined with Olaparib. Bopindolol may decrease the bronchodilatory activities of Theophylline. The metabolism of Selegiline can be decreased when combined with Theophylline. The metabolism of Theophylline can be decreased when combined with Levofloxacin. The metabolism of Theophylline can be increased when combined with Rifampicin. The serum concentration of Theophylline can be decreased when it is combined with Cholesterol. The metabolism of Theophylline can be decreased when combined with Verapamil. The metabolism of Theophylline can be decreased when combined with Ranolazine. The metabolism of Theophylline can be increased when combined with Primidone. Bisoprolol may decrease the bronchodilatory activities of Theophylline. The metabolism of Nitric Oxide can be decreased when combined with Theophylline. The metabolism of Pyrazinamide can be decreased when combined with Theophylline. The metabolism of Domperidone can be decreased when combined with Theophylline. The serum concentration of Theophylline can be increased when it is combined with Diethylstilbestrol. The metabolism of Clopidogrel can be decreased when combined with Theophylline. The serum concentration of Theophylline can be decreased when it is combined with Isoflurophate. The serum concentration of Theophylline can be decreased when it is combined with Lepirudin. The risk or severity of adverse effects can be increased when Theophylline is combined with Pancuronium. The metabolism of Theophylline can be decreased when combined with Interferon alfa-n1. The metabolism of Theophylline can be decreased when combined with Interferon alfacon-1. The serum concentration of Theophylline can be decreased when it is combined with Cilastatin. The metabolism of Acenocoumarol can be decreased when combined with Theophylline. The metabolism of Theophylline can be decreased when combined with Kitasamycin. The serum concentration of Theophylline can be decreased when it is combined with Spirapril. The metabolism of Pantoprazole can be decreased when combined with Theophylline. The metabolism of Theophylline can be decreased when combined with Chloroquine. The serum concentration of Theophylline can be increased when it is combined with Estriol. The therapeutic efficacy of Diazepam can be decreased when used in combination with Theophylline. The metabolism of Theophylline can be decreased when combined with Darifenacin. The metabolism of Theophylline can be decreased when combined with Tranylcypromine. The serum concentration of Theophylline can be increased when it is combined with Allopurinol. The therapeutic efficacy of Camazepam can be decreased when used in combination with Theophylline. The metabolism of Toremifene can be decreased when combined with Theophylline. The serum concentration of Theophylline can be increased when it is combined with Dienestrol. The metabolism of Theophylline can be decreased when combined with Nefazodone. Oxprenolol may decrease the bronchodilatory activities of Theophylline.