Rupatadine is a second-generation antihistamine and platelet-activating factor (PAF) antagonist used to treat symptoms of allergic conditions, such as allergic rhinitis (sneezing, runny nose, nasal congestion) and chronic urticaria (itching, hives). It works by blocking histamine H1 receptors and inhibiting PAF activity, reducing inflammatory responses. Rupatadine is non-sedating and is commonly available in oral formulations. As a pharmaceutical chemical, it is supplied with 98% purity for research or manufacturing purposes.