Bronex Expectorant is a cough syrup that is used to treat coughs associated with bronchitis, asthma, and other respiratory conditions. It contains a combination of active ingredients, including guaiphenesin, terbutaline, and bromhexine. Guaiphenesin is an expectorant that helps to thin and loosen mucus in the lungs, making it easier to cough up. Terbutaline is a bronchodilator that helps to open up the airways, making it easier to breathe. Bromhexine is another expectorant that works by breaking down mucus in the airways. The combination of these ingredients helps to relieve coughs and other symptoms associated with respiratory conditions.