title: Concomitant use of beta adrenergic agonists and methylxanthines.
mesh_terms: D000318:Adrenergic beta-Agonists / Q000627:therapeutic use*; D004359:Drug Therapy, Combination; D006801:Humans; D014970:Xanthines / Q000627:therapeutic use*
chemical_list: D000318:Adrenergic beta-Agonists; D014970:Xanthines; C008514:methylxanthine