Respiratory System Agents

Drugs acting on the airway and lungs, following ATC Group R (Respiratory System). Belongs here: a bronchodilator used to relieve airway constriction and any other agent whose primary classified target is the respiratory tract. Does not belong here: an antiinfective used to treat a respiratory infection, grouped under antiinfective agents for systemic use, because ATC classifies it by the causative organism rather than by the organ it affects.