Rupatadine Fumarate is primarily used as an antihistamine and platelet-activating factor (PAF) antagonist. It is effective in treating allergic conditions such as rhinitis and chronic urticaria. By blocking histamine H1 receptors, it alleviates symptoms like sneezing, itching, and nasal congestion. Its dual action on PAF further enhances its anti-allergic properties, making it suitable for managing inflammatory responses associated with allergies. It is commonly prescribed for both seasonal and perennial allergic conditions, providing relief with minimal sedative effects compared to older antihistamines.