Combined beta agonists and methylxanthines in asthma.
D000293:Adolescent; D000318:Adrenergic beta-Agonists / Q000008:administration & dosage*; D000328:Adult; D001249:Asthma / Q000188:drug therapy* / Q000401:mortality; D002648:Child; D002675:Child, Preschool; D004359:Drug Therapy, Combination; D006801:Humans; D009520:New Zealand; D013806:Theophylline / Q000008:administration & dosage; D014970:Xanthines / Q000008:administration & dosage*
D000318:Adrenergic beta-Agonists; D014970:Xanthines; C008514:methylxanthine; D013806:Theophylline