Klm FX M 10mg/120mg Tablet is a combination medication containing Montelukast 10mg and Fexofenadine 120mg, indicated for the management of allergic conditions such as allergic rhinitis and chronic urticaria. Montelukast, a leukotriene receptor antagonist, works by blocking leukotriene D4 receptors in the respiratory tract, thereby reducing inflammation, bronchoconstriction, and mucus production associated with allergic responses. Fexofenadine, a second-generation antihistamine, selectively inhibits peripheral H1 receptors, effectively alleviating symptoms such as sneezing, nasal congestion, itching, and hives without causing significant sedation. This dual-action formulation provides comprehensive relief by targeting multiple pathways involved in allergic reactions. Klm FX M is typically administered orally once daily, with or without food, as prescribed by a healthcare professional. It is well-tolerated, though patients should be monitored for potential side effects such as headache, dizziness, gastrointestinal discomfort, or hypersensitivity reactions. Caution is advised in patients with hepatic or renal impairment, and it is contraindicated in individuals with known hypersensitivity to either component. Klm FX M offers an effective therapeutic option for patients requiring combined leukotriene receptor antagonism and antihistaminic activity to control persistent allergic symptoms and improve quality of life.