LACETRA-TAB contains a combination of Montelukast Sodium 10 mg and Levocetirizine Hydrochloride 5 mg, which is commonly used to treat allergic rhinitis and asthma. Montelukast is a leukotriene receptor antagonist that helps reduce inflammation and prevents the narrowing of airways, making it effective in managing asthma and preventing asthma attacks. Levocetirizine, an antihistamine, works by blocking histamine, a substance in the body that causes allergic symptoms like sneezing, runny nose, and itching. Together, this combination provides relief from allergy symptoms such as nasal congestion, sneezing, and itchy eyes, while also helping to manage asthma symptoms. LACETRA-TAB is typically prescribed for individuals with seasonal allergies, chronic allergic conditions, or mild to moderate asthma. Common side effects may include drowsiness, headache, or dry mouth. Always take this medication as prescribed by your doctor for effective symptom control.