Letter: Ibuterol hydrochloride and terbutaline in asthma.
D001249:Asthma / Q000188:drug therapy*; D002087:Butyrates / Q000627:therapeutic use; D004305:Dose-Response Relationship, Drug; D006801:Humans; D013726:Terbutaline / Q000031:analogs & derivatives* / Q000627:therapeutic use*
D002087:Butyrates; D013726:Terbutaline