Doxofylline is a methylxanthine bronchodilator that has been examined in clinical trials involving patients with either bronchial asthma or chronic obstructive pulmonary disease. Its mechanism of action is related to its ability to inhibit phosphodiesterase activity and, thus, increase cAMP. Compared to other xanthine derivatives, which have direct arrhythmogenic effects, doxofylline demonstrates decreased affinity towards adenosine A1 and A2 receptors, does not interfere with calcium influx into cells, and does not antagonize the action of calcium-channel blockers.
