Alex-L SF Mango Flavour Oral Suspension 100 ml contains an anti-tussive (cough suppressant) medication primarily used to treat dry cough. Cough is a reflex action that helps to clear any foreign irritant or mucus in the throat. Mostly 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.