Ambroxol HCl is a mucolytic agent used to treat respiratory conditions associated with excessive mucus production. It works by thinning and loosening mucus in the respiratory tract, making it easier to cough up and clear from the airways. Ambroxol also has a local numbing effect, providing pain relief for sore throats. It is commonly used in the treatment of conditions such as tracheobronchitis, emphysema, bronchitis, and asthma.