Alex Sugar Free Cough Lozenges is used to treat dry cough. Cough is a reflex action that helps to clear any foreign irritant or mucus in the throat. Mostly, a cough lasts for a short time (two to three weeks), so it is acute. But sometimes, if it is persistent for more than eight weeks, it can lead to chronic cough. Dry cough refers to a cough where there is no mucus or secretion along with cough.