8.13 Xanthine Derivatives V2

Xanthine derivatives, theophylline, is used as a bronchodilator for asthma unresponsive to inhaled corticosteroids or long-acting beta-adrenergic medications. It has proven effective in reducing the frequency and severity of symptoms, including nocturnal exacerbations and prn doses of beta-2 agonists (Daily Med, 2026). Unfortunately, it is not widely used due to its low safety margin and drug interactions. Close monitoring and client adherence is key to the safe use of this med.

Mechanism of Action

Xanthine derivative medications resemble naturally occurring xanthines such as caffeine, theobromine and methylxanthines, which are components of coffee, tea and chocolate.

Although the mechanism of action is not completely understood, theophylline inhibits tissue phosphodiesterase which increases cellular cyclic AMP levels (inhibits the breakdown and metabolism). This results in relaxation of bronchial smooth muscle and pulmonary blood vessels, as well as inhibiting IgE released chemical mediators such as histamine among other. This results in its anti-inflammatory effects (Bethesda, 2020). It also is an adenosine receptor antagonist, which can cause arrythmias.  Overall, it suppresses airway responsiveness to stimuli that cause bronchoconstriction.

Indications for Use

Theophylline is a second line drug used for the long-term management of persistent asthma that is unresponsive to beta agonists or inhaled corticosteroids. It is given orally, and can lead to a decrease in the frequency and severity of asthma attacks. Due to its prolonged effects, it is effective for clients who have nocturnal attacks (Rosenjack Burchum & Rosenthal, 2019). It is no longer used for COPD.

Nursing Considerations

Administration:

• oral, sustained release taken once a day. Do not take at night or within 60 minutes of a high fat meal.
• IV: IV theophylline can be given in acute bronchospasm. But the efficacy is similar to beta 2 agonists and glucocorticoids, and with much more safety risk due to narrow therapeutic window.

Theophylline has a low therapeutic window of 10-20 mcq/mL (Jilani, Pruess & Sharma, 2023).

As with other meds with low therapeutic window, if too low of a drug level, the effects are subtherapeutic, and if too high, there are toxic effects. Many variables can impact the therapeutic levels including consuming certain foods, smoking, and medications. For example;

• Caffeine competes with the theophylline for metabolizing liver enzymes, leading to theophylline levels to rise. Avoiding or limit caffeine is recommended.
• Charbroiled meats will increase theophylline metabolism.
• Tobacco induces theophylline metabolism. If the client smokes, they need to be consistent. If they plan to quit, the med levels need to be reduced to avoid toxicity.
• Drug interactions include phenytoin, rifampicin, cimetidine, oral contraceptives.

Monitoring:

• Respiratory assessment prior to therapy and periodically.
• CNS effects such as headache, anxiety and tremors.
• Serum theophylline levels prior to therapy, with dose adjustments, signs of toxicity and yearly.

Metabolized in the liver so any liver dysfunction can lead to increased half-life and risk for toxicity.

Cautious use with hyperthyroidism, cardiac disease, peptic ulcer disease, hepatic dysfunction and seizure disorders.

Theophylline can be administered to the older adult and children but very careful monitoring must occur to prevent toxicity.

(DailyMed, 2026; Jilani, Pruess & Sharma, 2023)

Adverse/Side Effects

Theophylline is generally well-tolerated. Side effects include:

• CNS stimulation such as tremor, anxiety, nervousness, headache and insomnia.
• GI: nausea, vomiting, increased stomach acid secretion, and gastroesophageal reflux (Frandsen & Pennington, 2018).

Adverse effects related to toxic levels include:

• convulsions and cardiac arrhythmias (ventricular fibrillation if severe)

Managing toxicity: close assessment for early signs of toxicity such as GI distress, insomnia and tremor. Latter signs of toxicity or overdose, include convulsions and arrythmias.  If recent overdose of med is suspected, activated charcoal can be given, beta blockers for dysrhythmias and benzodiazepines for seizures (Jilani, Pruess & Sharma, 2023).

Client Teaching

• Clients should be sure to take medications as prescribed. Do not double up a missed dose. Do not crush or break extended-release tablets.
• Close adherence to food and beverage restrictions. Avoid caffeine, chocolate, charbroiled meats and high fat meals.
• If client smokes, consistent use is important. If they plan to increase or decrease the amount smoked (i.e. plan to quit), dose adjustment is needed.
• Anticipate serum theophylline levels as instructed by the prescriber, such as with any reported adverse effects, change in diet, or illness.
• Report any side effects right away to health care provider.
• Do not take any additional prescription, OTC or herbal remedies without discussing with prescriber to avoid drug interactions.

Jilani, Preuss & Sharma, 2023; Mayo Clinic, 2026;

Theophylline Medication Card

Now let’s take a closer look at the medication card on theophylline (Daily Med, 2026; Frandsen & Pennington, 2018). Because information about medication is constantly changing, nurses should always consult evidence-based resources to review current recommendations before administering specific medication.

Downloadable file (.docx):  Theophylline Medication Card

To support your learning, you can access the Chapter 8 Comparing Respiratory Medications med cards.   This is a downloadable and editable document to allow you to update and add content.

References

• Bethesda, MD. (2020). Xanthine Derivatives. LiverTox: Clinical and Research Information on Drug-Induced Liver Injury [Internet]. Xanthine Derivatives – LiverTox – NCBI Bookshelf
• Daily Med (2026). Theophylline. U.S. National Library of Medicine. DailyMed – THEOPHYLLINE (ANHYDROUS)- theophylline tablet, extended release
• Frandsen, G. & Pennington, S. (2018). Abrams’ clinical drug: Rationales for nursing practice (11th ed.). Wolters Kluwer. ↵
• Jilani; T. Preuss, C. & Sharma, S. (20230. Theophylline. StatPearls [Internet].  Theophylline – StatPearls – NCBI Bookshelf
• Mayo Clinic (2026). Theophylline. Theophylline (oral route) – Side effects & dosage – Mayo Clinic
• Rosenjack Burchum, J., & Rosenthal, L. (2019). Lehne’s pharmacology for nursing care (10th ed.). Elsevier: Canada