黄嘌呤支气管扩张剂和PDE抑制剂;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