The metabolism of Theophylline can be decreased when combined with Gemfibrozil. The metabolism of Bendamustine can be decreased when combined with Theophylline. The metabolism of Theophylline can be decreased when combined with Kitasamycin. The metabolism of Rotigotine can be decreased when combined with Theophylline. The serum concentration of Theophylline can be decreased when it is combined with Lepirudin. The metabolism of Theophylline can be decreased when combined with Dosulepin. The metabolism of Theophylline can be decreased when combined with Eliglustat. The metabolism of Mirtazapine 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 Sivelestat. The serum concentration of Theophylline can be increased when it is combined with Carbimazole. The metabolism of Theophylline can be decreased when combined with Boceprevir. The metabolism of Theophylline can be decreased when combined with Cinoxacin. The serum concentration of Theophylline can be decreased when it is combined with Asunaprevir. The metabolism of Theophylline can be decreased when combined with Rosiglitazone. The metabolism of Primaquine can be decreased when combined with Theophylline. The serum concentration of Lithium can be decreased when it is combined with Theophylline. The metabolism of Theophylline can be increased when combined with Primidone. The metabolism of Theophylline can be decreased when combined with Fluvoxamine. The serum concentration of Theophylline can be decreased when it is combined with Cholesterol. The serum concentration of Theophylline can be decreased when it is combined with Benzamidine. The serum concentration of Theophylline can be decreased when it is combined with Cilazapril. The metabolism of Diclofenac can be decreased when combined with Theophylline. The serum concentration of Theophylline can be decreased when it is combined with Dabigatran etexilate. The metabolism of Theophylline can be decreased when combined with Pazufloxacin. The metabolism of Selegiline can be decreased when combined with Theophylline. The serum concentration of Theophylline can be increased when it is combined with Mifepristone. The metabolism of Theophylline can be decreased when combined with Ticlopidine. The serum concentration of Theophylline can be decreased when it is combined with Imidapril. The metabolism of Lumiracoxib can be decreased when combined with Theophylline. The therapeutic efficacy of CE-326597 can be decreased when used in combination with Theophylline. The serum concentration of Theophylline can be increased when it is combined with Osimertinib. The serum concentration of Theophylline can be increased when it is combined with Lumacaftor. The serum concentration of Theophylline can be decreased when it is combined with Perindopril. The metabolism of Cisapride can be decreased when combined with Theophylline. The metabolism of Theophylline can be decreased when combined with Capecitabine. Carteolol may decrease the bronchodilatory activities of Theophylline. The metabolism of Cilostazol can be decreased when combined with Theophylline. The metabolism of Theophylline can be decreased when combined with Erythromycin. The serum concentration of Theophylline can be increased when it is combined with Mestranol. The serum concentration of Theophylline can be decreased when it is combined with Elafin. The metabolism of Aminophylline can be decreased when combined with Theophylline. The serum concentration of Theophylline can be increased when it is combined with Quinestrol. The serum concentration of Theophylline can be decreased when it is combined with Carbamazepine. The metabolism of Theophylline can be decreased when combined with Crizotinib. The metabolism of Theophylline can be decreased when combined with Interferon Alfa-2a, Recombinant. The metabolism of Ranitidine can be decreased when combined with Theophylline. The metabolism of Theophylline can be decreased when combined with Levofloxacin. The therapeutic efficacy of SJG-136 can be decreased when used in combination with Theophylline. The metabolism of Daunorubicin can be decreased when combined with Theophylline. The therapeutic efficacy of Flumazenil can be decreased when used in combination with Theophylline. The metabolism of Trifluoperazine can be decreased when combined with Theophylline. The metabolism of Theophylline can be decreased when combined with Fluvastatin. The metabolism of Theophylline can be decreased when combined with Quinidine. The therapeutic efficacy of Midazolam can be decreased when used in combination with Theophylline. The therapeutic efficacy of Netazepide can be decreased when used in combination with Theophylline. The serum concentration of Theophylline can be decreased when it is combined with Teriflunomide. The serum concentration of Theophylline can be increased when it is combined with Dasatinib. The metabolism of Theophylline can be decreased when combined with Thiabendazole. The metabolism of Theobromine can be decreased when combined with Theophylline. The serum concentration of Theophylline can be decreased when it is combined with Amprenavir. The serum concentration of Theophylline can be decreased when it is combined with Alpha-1-proteinase inhibitor. The serum concentration of Theophylline can be decreased when it is combined with 3,4-Dichloroisocoumarin. The serum concentration of Theophylline can be decreased when it is combined with St. John's Wort. The metabolism of Theophylline can be decreased when combined with Dihydroergotamine. The metabolism of Theophylline can be decreased when combined with Diltiazem. The therapeutic efficacy of Clonazepam can be decreased when used in combination with Theophylline. The metabolism of Theophylline can be decreased when combined with Methotrimeprazine. The therapeutic efficacy of Triazolam can be decreased when used in combination with Theophylline. The metabolism of Clonidine can be decreased when combined with Theophylline. The serum concentration of Theophylline can be decreased when it is combined with Faldaprevir. The metabolism of Dinoprostone can be decreased when combined with Theophylline. The metabolism of Melatonin can be decreased when combined with Theophylline. Atenolol may decrease the bronchodilatory activities of Theophylline. The serum concentration of Theophylline can be decreased when it is combined with Prinomastat. Bisoprolol may decrease the bronchodilatory activities of Theophylline. 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 Quinine. The metabolism of Theophylline can be decreased when combined with Telithromycin. The therapeutic efficacy of Flunitrazepam can be decreased when used in combination with Theophylline. The therapeutic efficacy of Nitrazepam can be decreased when used in combination with Theophylline. The metabolism of Theophylline can be decreased when combined with Interferon alfacon-1. The metabolism of Rofecoxib can be decreased when combined with Theophylline. The serum concentration of Theophylline can be increased when it is combined with Netupitant. The metabolism of Theophylline can be decreased when combined with Ziprasidone. The metabolism of Theophylline can be decreased when combined with Fluoxetine. The metabolism of Theophylline can be increased when combined with Phenobarbital. The metabolism of Apixaban can be decreased when combined with Theophylline. The serum concentration of Theophylline can be decreased when it is combined with Zofenopril. The serum concentration of Theophylline can be decreased when it is combined with Ximelagatran. The metabolism of Pazopanib can be decreased when combined with Theophylline. The metabolism of Mianserin can be decreased when combined with Theophylline. The serum concentration of Theophylline can be increased when it is combined with Estrogens, esterified. The serum concentration of Theophylline can be decreased when it is combined with Lisinopril. The metabolism of Carmustine can be decreased when combined with Theophylline. The metabolism of Theophylline can be increased when combined with Rifabutin. The metabolism of Nabumetone can be decreased when combined with Theophylline. The metabolism of Ergotamine can be decreased when combined with Theophylline. The serum concentration of Theophylline can be increased when it is combined with Ivacaftor. The serum concentration of Theophylline can be decreased when it is combined with Alogliptin. The metabolism of Haloperidol can be decreased when combined with Theophylline. The metabolism of Pantoprazole can be decreased when combined with Theophylline. The metabolism of Theophylline can be decreased when combined with Cepeginterferon alfa-2B. The serum concentration of Theophylline can be increased when it is combined with Equol. The metabolism of Methoxyflurane can be decreased when combined with Theophylline. The metabolism of Theophylline can be decreased when combined with Idelalisib. The metabolism of Lorcaserin can be decreased when combined with Theophylline. The metabolism of Vadimezan can be decreased when combined with Theophylline. The risk or severity of adverse effects can be increased when Theophylline is combined with Formoterol. The serum concentration of Theophylline can be decreased when it is combined with Benazepril. The serum concentration of Theophylline can be decreased when it is combined with Metreleptin. The therapeutic efficacy of Clorazepate can be decreased when used in combination with Theophylline. The metabolism of Hesperetin can be decreased when combined with Theophylline. The serum concentration of Theophylline can be decreased when it is combined with Candoxatrilat. The serum concentration of Theophylline can be increased when it is combined with Methallenestril. The serum concentration of Theophylline can be decreased when it is combined with Phenytoin. The serum concentration of Theophylline can be decreased when it is combined with Nitroaspirin. The risk or severity of adverse effects can be increased when Theophylline is combined with Indacaterol. The serum concentration of Theophylline can be increased when it is combined with Cobicistat. Oxprenolol may decrease the bronchodilatory activities of Theophylline. The metabolism of Bupivacaine can be decreased when combined with Theophylline. The metabolism of Estrone can be decreased when combined with Theophylline. Celiprolol may decrease the bronchodilatory activities of Theophylline. The metabolism of Theophylline can be decreased when combined with Midostaurin. The metabolism of Aminophenazone can be decreased when combined with Theophylline. The metabolism of Theophylline can be decreased when combined with Lobeglitazone. The metabolism of Praziquantel can be decreased when combined with Theophylline. The metabolism of Albendazole can be decreased when combined with Theophylline. The therapeutic efficacy of Fludiazepam can be decreased when used in combination with Theophylline. The serum concentration of Theophylline can be increased when it is combined with Abiraterone.