Montelukast Sodium Tablets are anti-allergic formulation that belongs to second-generation antihistamine class of medications. They are prescribed for the treatment of allergic rhinitis and long term hives. These tablets also comprise levocetirizine as another active compound with chemical formula C21H25ClN2O3 and molecular weight of 388.888 g/mol. They serve as an inverse agonist that block activity at histamine H-1 receptor site for exerting their curative effects. Montelukast Sodium Tablets get metabolized in the liver with the help of CYP3A4. They show very high bioavailability with excellent protein binding ability of 90% and elimination half life of 6-10 hours.