Theophylline is a xanthine derivative that induces relaxation of smooth muscle in the bronchial tree causing bronchodilation. Theophylline is widely used in therapy of asthma and is not believed to cause liver injury.
Theophylline (thee of' i lin) is an effective bronchodilator and is widely used in treatment of acute attacks of asthma and in chronic management of bronchospasm in patients with asthma and chronic obstructive pulmonary disease. Theophylline was approved for use in the United States in 1982 and is available in multiple generic forms for oral and intravenous use. Typical capsule or tablet sizes are 100, 200 and 300 mg. Typical dose regimens are 100 to 300 mg three to four times daily. Syrups are available for use in children. Extended release formulations are also available in sizes of 100 to 600 mg which are typically given twice daily. Dosage is highly individualized. Intravenous formations are available for management of acute asthmatic attacks. Theophylline is marketed under multiple brand names including Asmalix, Elixophyllin, Quibron-T, Respbid, Theobid, Duracaps, and Uniphyl. Common side effects of theophylline include dizziness, headache, insomnia, restlessness, tachycardia, palpitations, flushing, nausea, abdominal discomfort and diaphoresis, largely due to the effects of theophylline on the CNS, heart and muscle tissue.
Prospective studies have shown that ALT elevations occur in less than 1% of patients receiving long term oral therapy with theophylline, making it unlikely that such elevations are more common than might occur by chance. No instances of clinically apparent liver injury have been convincingly linked to theophylline use. Liver injury may occur as a part of generalized toxicity from high doses of theophylline probably as a result of hepatic complications of hypotension or anoxia from seizures or cardiac arrhythmias caused by the drug. Theophylline actually has been shown to attenuate several forms of experimental acute liver injury, and chronic caffeine (another xanthine) intake has been associated with decreased rates of chronic liver disease, cirrhosis and liver cancer.
Mechanism of Liver Injury
Theophylline is metabolized in the liver and levels are sensitive to stimulation or inhibition of the P450 enzyme system and levels are increased by many drugs such as cimetidine, corticosteroids, macrolide and quinolone antibiotics, and interferon. Theophylline levels may be decreased by barbiturates, phenytoin and rifampicin. Similarly, theophylline may affect the metabolism of other drugs and care must be used in adding theophylline in patients on multiple medications.
Outcome and Management
Typically, liver enzymes abnormalities that occur during therapy resolve rapidly even when theophylline is continued. Clinically apparent liver injury with jaundice does not occur or is too rare to make any statements about severity or prognosis.
REPRESENTATIVE TRADE NAMES
Theophylline – Slo-Phyllin®, Thio-Dur®, Uniphyl®
FDA product labeling at DailyMed, National Library of Medicine, NIH
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References Last Updated: 12 December 2013
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Makino S, Adachi M, Ohta K, Kihara N, Nakajima S, Nishima S, Fukuda T, et al. A prospective survey on safety of sustained-release theophylline in treatment of asthma and COPD. Allergol Int 2006; 55: 395-402. PubMed Citation (Prospective study of 3921 patients at 66 centers receiving sustained release theophylline found no serious adverse events; only 1 patient with ALT elevation).
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