Doxofylline (also known as doxophylline) is a phosphodiesterase inhibiting bronchodilator used in the treatment of chronic respiratory diseases such as asthma and COPD. Like theophylline, it is a xanthine derivative.

Unlike other xanthines, doxofylline lacks any significant affinity for adenosine receptors and does not produce stimulant effects. This suggests that its antiasthmatic effects are mediated by another mechanism, perhaps its actions on phosphodiesterase.