title: Phosphodiesterase type 4 inhibitors for asthma: a real breakthrough or just expensive theophylline?
authors.forename: Brian
authors.initials: B
authors.lastname: Lipworth
mesh_terms: D000631:Aminopyridines / Q000627:therapeutic use*; D001249:Asthma / Q000188:drug therapy*; D001549:Benzamides / Q000627:therapeutic use*; D003521:Cyclopropanes / Q000627:therapeutic use; D006801:Humans; D010726:Phosphodiesterase Inhibitors / Q000627:therapeutic use*; D016032:Randomized Controlled Trials as Topic; D013806:Theophylline / Q000627:therapeutic use*
chemical_list: D000631:Aminopyridines; D001549:Benzamides; D003521:Cyclopropanes; D010726:Phosphodiesterase Inhibitors; C424423:Roflumilast; D013806:Theophylline