Singulair 5mg is a prescription medication containing montelukast sodium, used to treat asthma and allergic rhinitis in children. Each pack contains 28 chewable tablets manufactured by MSD, designed to help prevent wheezing, breathing difficulties, and seasonal allergy symptoms. The active ingredient montelukast belongs to a class of drugs called leukotriene receptor antagonists. It works by blocking substances in the body that cause inflammation in the airways. The chewable tablet formulation makes it easier for children to take. This medication should be taken once daily in the evening as prescribed by a healthcare provider. Store at room temperature away from moisture and heat. This is a prescription-only medication that requires medical supervision.