S-Carboxymethyl-L-cysteine is widely used in the pharmaceutical industry as a mucolytic agent. It helps in breaking down and thinning mucus, making it easier to clear from the airways. This makes it particularly effective in treating respiratory conditions such as chronic bronchitis, sinusitis, and other disorders involving excessive or thick mucus production. Additionally, it is used to alleviate symptoms of otitis media with effusion, where it aids in reducing the viscosity of mucus in the middle ear. Beyond its mucolytic properties, it also exhibits antioxidant effects, which can help protect respiratory tissues from oxidative stress and inflammation. It is commonly administered in oral forms such as tablets or syrups, making it accessible for both adults and children.