黃嘌呤支氣管擴張劑和PDE抑制劑;Xanthine bronchodilator and PDE inhibitor;Doxofylline is a xanthine bronchodilator known to impede phosphodiesterase activities. Doxofylline is an inhibitor of PDE;Doxofylline is a xanthine bronchodilator known to impede phosphodiesterase activities. Doxofylline is an inhibitor of PDEA xanthine bronchodilator known to impede phosphodiesterase activities