Drug
Theophylline
Pronounced
"thee-OFF-ih-lin"
Drug Interactions
Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.
A product that may interact with this drug is: riociguat.
Other medications can affect the removal of theophylline from your body, which may affect how theophylline works. Examples include cimetidine, disulfiram, fluvoxamine, interferon, mexiletine, rifampin, drugs used to treat seizures (such as carbamazepine, phenytoin), St. John's wort, ticlopidine, viloxazine, among others.
Cigarette/marijuana (cannabis) smoking decreases blood levels of this medication. Tell your doctor if you smoke or if you have recently stopped smoking.
Caffeine and alcohol can increase the side effects of this medication. Avoid drinking large amounts of beverages containing alcohol or caffeine (such as coffee, tea, colas), eating large amounts of chocolate, or taking nonprescription products that contain caffeine.
Theophylline is very similar to aminophylline and oxtriphylline. Do not take medications containing aminophylline or oxtriphylline while using theophylline.
This medication may interfere with certain lab tests (such as blood sugar, cholesterol, uric acid, dipyridamole-thallium imaging tests), possibly causing false test results. Make sure lab personnel and all your doctors know you use this drug.
Negative Interactions
3- Potential Negative Interaction
Theophylline
Black Pepper
Piperine is a chemical found in black peppers (Piper nigrum, Piper longum). A human study found that single doses of piperine could increase blood levels of theophylline. Hypothetically, such an elevation could lead to increased theophylline side effects or dose reductions without loss of drug efficacy. However, further study is required before such conclusions are made. People should not change the amount of theophylline taken without consulting their physician.
Black PepperTheophylline- Bano G, Raina RK, Zutshi U, et al. Effect of piperine on bioavailability and pharmacokinetics of propranolol and theophylline in healthy volunteers. Eur J Clin Pharmacol 1991;41:615-7.
- Potential Negative Interaction
Theophylline
Foods with Caffeine
Large amounts of caffeine (a substance that is related to theophylline) may increase the activity and side effects of theophylline.Coffee, tea, colas, chocolate, guaraná, and some supplement products contain caffeine. Limiting intake of caffeine-containing beverages and products to small amounts will avoid this interaction.
Foods with CaffeineTheophylline- Threlkeld DS, ed. Respiratory Drugs, Bronchodilators, Xanthine Derivatives. In Facts and Comparisons Drug Information. St. Louis, MO: Facts and Comparisons, Feb 1991, 178-9a.
- Reduces Effectiveness
Theophylline
St. John’s Wort
One case study of a 42-year old asthmatic woman reported that taking 300 mg per day of St. John’s wort extract led to a significant decrease in blood levels of theophylline. Following discontinuation of St. John’s wort, the patient’s blood levels of theophylline returned to an acceptable therapeutic level. This may have occurred because certain chemicals found in St. John’s wort activate liver enzymes that are involved in the elimination of some drugs. Until more is known, people taking theophylline should avoid St. John’s wort.
St. John’s WortTheophylline- Nebel A, Schneider BJ, Baker RK, Kroll DJ. Potential metabolic interaction between St. John's wortand theophylline [letter]. Ann Pharmacother 1999;33:502.
- Mai I, Schmider J, et al. Unpublished results, May, 1999. Reported in: Johne A, Brockmöller, Bauer S, et al. Pharmacokinetic interaction of digoxin with an herbal extract from St. John's wort (Hypericum perforatum). Clin Pharmacol Ther 1999;66:338-45.
Supportive Interactions
3- Replenish Depleted Nutrients
Theophylline
Magnesium
Preliminary evidence indicates that theophylline can promote potassium and magnesium deficiency. Some doctors have noted a tendency for persons on theophylline to become deficient in these minerals. Therefore, supplementing with these minerals may be necessary during theophylline therapy. Consult with a doctor to make this determination.
MagnesiumTheophylline- Rayssiguier Y. Hypomagnesemia resulting from adrenaline infusion in ewes: Its relation to lipolysis. Horm Metab Res 1977;9:309-14.
- Smith SR, Gove I, Kendall MJ. Beta agonists and potassium. Lancet 1985;1:1394.
- Replenish Depleted Nutrients
Theophylline
Potassium
Preliminary evidence indicates that theophylline can promote potassium and magnesium deficiency. Some doctors have noted a tendency for persons on theophylline to become deficient in these minerals. Therefore, supplementing with these minerals may be necessary during theophylline therapy. Consult with a doctor to make this determination.
PotassiumTheophylline- Rayssiguier Y. Hypomagnesemia resulting from adrenaline infusion in ewes: Its relation to lipolysis. Horm Metab Res 1977;9:309-14.
- Smith SR, Gove I, Kendall MJ. Beta agonists and potassium. Lancet 1985;1:1394.
- Replenish Depleted Nutrients
Theophylline
Vitamin B6
Theophyline has been associated with depressed serum vitamin B6 levels in children with asthma and adults with chronic obstructive pulmonary disease. In a short-term study of healthy adults, theophylline reduced serum vitamin B6 levels and supplementation with vitamin B6 (10 mg per day) normalized vitamin B6 levels. Some doctors believe that it makes sense for people taking this drug to accompany it with 10 mg of vitamin B6 per day.
Vitamin B6Theophylline- Shimizu T, Maeda S, Arakawa H, et al. Relation between theophylline and circulating vitamin levels in children with asthma. Pharmacology 1996;53:384-9.
- Martinez de Haas MG, Poels PJ, de Weert CJ, et al. Subnormal vitamin B6 levels in theophylline users. Ned Tijdschr Geneeskd 1997;141:2176-9 [in Dutch].
- Ubbink JB, Delport R, Becker PJ, Bissbort S. Evidence of a theophylline-induced vitamin B6 deficiency caused by noncompetitive inhibition of pyridoxal kinase. J Lab Clin Med 1989;113:15-22.
Explanation Required
3- Needs Explanation
Theophylline
Cruciferous Vegetables
Low-carbohydrate, high-protein diets, charbroiled beef, and many types of cruciferous vegetables (broccoli, Brussels sprouts, cabbage, and cauliflower) can reduce theophylline activity. High-carbohydrate, low-protein diets can increase theophylline activity and side effects. Sustained-release forms of theophylline should be taken on an empty stomach and should not be crushed or chewed. Liquid and non-sustained release theophylline products are best taken on an empty stomach, but they may be taken with food if stomach upset occurs. People with questions about theophylline and food should ask their prescribing doctor or pharmacist.
Cruciferous VegetablesTheophylline- Threlkeld DS, ed. Respiratory Drugs, Bronchodilators, Xanthine Derivatives. In Facts and Comparisons Drug Information. St. Louis, MO: Facts and Comparisons, Feb 1991, 178-9a.
- Holt GA. Food & Drug Interactions. Chicago: Precept Press, 1998, 260.
- Needs Explanation
Theophylline
Soy
In a study of healthy volunteers given theophylline, ingesting daidzein (one of the major isoflavones in soy) in the amount of 200 mg twice a day for ten days inhibited the metabolism of theophylline, resulted in higher concentrations of the drug. The amount of daidzein used in this study was greater than what would be found in a normal portion of soy foods; it is not known whether consuming average amounts of soy would have a similar effect.
SoyTheophylline- Peng WX, Li HD, Zhou HH. Effect of daidzein on CYP1A2 activity and pharmacokinetics of theophylline in healthy volunteers. Eur J Clin Pharmacol 2003;59:237-41.
- Needs Explanation
Theophylline
Teas and Herbs with Tannin
Herbs high in tannins can impair the absorption of theophylline. High-tannin herbs include green tea, black tea, uva ursi (Arctostaphylos uva-ursi), black walnut (Juglans nigra), red raspberry (Rubus idaeus), oak (Quercus spp.), and witch hazel (Hamamelis virginiana).
Teas and Herbs with TanninTheophylline- Brinker F. Interactions of pharmaceutical and botanical medicines. J Naturopathic Med 1997;7(2):14-20.