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Theophylline: Effects, Dosage and Side Effects

Theophylline is a medication used to treat respiratory conditions such as asthma and COPD. It relaxes and widens the airways, making breathing easier.

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Things worth knowing about "Theophylline"

Theophylline is a medication used to treat respiratory conditions such as asthma and COPD. It relaxes and widens the airways, making breathing easier.

What is Theophylline?

Theophylline is a bronchodilator belonging to the xanthine class of medications, primarily used to manage chronic respiratory diseases. It is a naturally occurring alkaloid found in small amounts in tea leaves and cocoa. For medical use, it is produced synthetically and formulated as a pharmaceutical drug.

Indications

Theophylline is mainly used for the following conditions:

Bronchial asthma: for long-term management and prevention of attacks
Chronic obstructive pulmonary disease (COPD): to widen the airways and relieve breathlessness
Chronic bronchitis: as supportive therapy for bronchospasm
Apnea in premature infants: in low doses to stimulate breathing

Mechanism of Action

Theophylline exerts its effects through several mechanisms:

Phosphodiesterase inhibition: By blocking these enzymes, theophylline prevents the breakdown of cyclic AMP (cAMP). Elevated cAMP levels lead to relaxation of the smooth muscle in the bronchial walls, widening the airways.
Adenosine receptor antagonism: Theophylline blocks adenosine receptors that would otherwise promote bronchoconstriction (narrowing of the airways).
Anti-inflammatory effects: At therapeutic concentrations, theophylline inhibits certain inflammatory processes in the airways.
Respiratory stimulation: It increases the sensitivity of the respiratory center in the brain to carbon dioxide, stimulating breathing.

Dosage and Administration

Theophylline is administered orally -- usually as a sustained-release (extended-release) tablet for steady drug delivery -- or intravenously in hospital settings. Dosage must be individually adjusted because theophylline has a narrow therapeutic index.

The typical therapeutic serum concentration range is 10 to 20 micrograms per milliliter. Regular blood level monitoring is essential to prevent under- or overdosing. Factors such as age, body weight, smoking status, liver disease, and concurrent medications can significantly affect theophylline blood levels.

Side Effects

Theophylline has a relatively narrow therapeutic window, meaning the difference between an effective dose and a toxic dose is small. Possible side effects include:

Mild side effects: Nausea, vomiting, stomach irritation, headache, insomnia, restlessness, increased heart rate (tachycardia)
Severe side effects (overdose): Cardiac arrhythmias, seizures, severe drop in blood pressure, life-threatening toxicity

Drug Interactions

Theophylline has numerous interactions with other medications and substances:

Increased theophylline levels (risk of toxicity): Macrolide antibiotics (e.g., erythromycin), fluoroquinolones (e.g., ciprofloxacin), cimetidine, oral contraceptives, alcohol
Decreased theophylline levels (reduced efficacy): Smoking, rifampicin, phenobarbital, phenytoin
Caffeine: Caffeine is a related xanthine and can amplify both the effects and side effects of theophylline.

Contraindications

Theophylline should not be used, or only used under strict medical supervision, in patients with:

Severe heart disease or cardiac arrhythmias
Active peptic ulcer disease
Epilepsy (seizure disorders)
Severe liver insufficiency
Known hypersensitivity to theophylline or other xanthines

Role in Modern Therapy

With the introduction of more modern bronchodilators -- particularly inhaled beta-2 agonists (e.g., salbutamol) and long-acting anticholinergics -- theophylline has become less prominent in the management of asthma and COPD. It is now mostly used as a second-line or add-on therapy when other medications are insufficiently effective. Nevertheless, in certain countries and for specific patient populations, theophylline remains a relevant component of treatment regimens.

References

Global Initiative for Asthma (GINA): Global Strategy for Asthma Management and Prevention. ginasthma.org, 2023.
Global Initiative for Chronic Obstructive Lung Disease (GOLD): Global Strategy for the Diagnosis, Management, and Prevention of COPD. goldcopd.org, 2023.
Barnes P.J.: Theophylline. American Journal of Respiratory and Critical Care Medicine, 188(8): 901-906, 2013. PubMed PMID: 23972067.

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