Drugs acting on respiratory system Cough antitussive drugs centrally acting peripherally acting Sputum expectorant drugs sputum-diluting drugs mucolytic drugs Asthma antiasthmatic drugs bronchodilators 阝 receptor agonists theophyllines muscarinic antagonists anti-inflammatory drugs glucocorticosteroids mediator release inhibitorsDrugs acting on respiratory system Cough antitussive drugs centrally acting peripherally acting Sputum expectorant drugs sputum-diluting drugs mucolytic drugs Asthma antiasthmatic drugs bronchodilators receptor agonists theophyllines muscarinic antagonists anti-inflammatory drugs glucocorticosteroids mediator release inhibitors