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Encyclopedia > Methylxanthine

Xanthines are a group of alkaloids that are commonly used for their effects as mild stimulants and as bronchodilators, notably in treating the symptoms of asthma. They include caffeine, theophylline, theobromine (found mainly in chocolate), and mateine.


The core compound, xanthine, is a product on the pathway of purine degradation and is converted to uric acid by the action of xanthine oxidase.


The structure of xanthine is:


image:xanthine.png


Xanthines are purine derivatives and found very rarely in constituents of nucleic acids.


  Results from FactBites:
 
Prophylactic methylxanthine for prevention of apnea in preterm infants (2313 words)
Methylxanthines are thought to stimulate breathing efforts and have been used in clinical practice to reduce apnea since the 1970's.
Theophylline and caffeine are two forms of methylxanthine that have been used and they are effective for the treatment of infants with recurrent apnea (Henderson-Smart 2005).
Another review has suggested that methylxanthines prior to extubation might be of benefit in reducing the rate of respiratory failure, which is due in part to hypoventilation and apnea (Henderson-Smart 05a).
Methylxanthine treatment for apnea in preterm infants (3398 words)
Methylxanthines are thought to stimulate breathing efforts and have been used in clinical practice to reduce apnea since the 1970's (reviewed by Samuels 1992; Henderson-Smart 04b; Comer 2001).
Although methylxanthines lead to a reduction of apnea in preterm infants who have this clinical problem, they are not effective when given as prophylaxis to spontaneously breathing preterm infants at risk of developing apnea/bradycardia because of their low gestational age (Henderson-Smart 04a).
Methylxanthines are effective in reducing the number of apneic attacks in the short term and in reducing the use of mechanical ventilation.
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