Melatonin 5 mg is prescribed and used for relieving cough. It is classified as a non-narcotic medicine for cough. Melatonin 5 mg comes under the medicine class antitussives or cold suppressants. During a cough and cold, the cough reflex remains quite active. The main purpose of this medicine is to numb the throat and lungs at this point to minimize the reflex action. As the reflex action in the air passages and lungs gets reduced, patients automatically cough less and feel a sense of relief in their throat. The popular brand name of this drug is Tessalon, but available in the leading online pharmacies under its generic name too.