Montex 5 mg is a chewable tablet containing Montelukast Sodium, equivalent to 5 mg of Montelukast. It is manufactured by Ibn Sina Pharmaceutical Industry PLC in Bangladesh. Montelukast is a leukotriene receptor antagonist that helps manage and prevent asthma symptoms and relieve allergic rhinitis (hay fever) in children aged 6 to 14 years. It works by blocking leukotrienes, substances in the body that cause inflammation, swelling, and constriction in the airways.