Levocet-D Tablet is a combination medication containing Levocetirizine 5mg and Phenylephrine 10mg, indicated for the relief of symptoms associated with allergic rhinitis and nasal congestion. Levocetirizine, a third-generation non-sedative antihistamine, selectively inhibits peripheral H1 receptors, thereby reducing allergic symptoms such as sneezing, rhinorrhea, nasal itching, and watery eyes. Phenylephrine, a selective alpha-1 adrenergic receptor agonist, acts as a decongestant by constricting nasal blood vessels, leading to decreased nasal mucosal edema and improved airflow. This dual-action formulation provides effective symptomatic relief from both allergic manifestations and nasal congestion commonly seen in conditions such as seasonal allergic rhinitis, perennial allergic rhinitis, and common cold. Levocet-D is generally well tolerated; however, caution is advised in patients with hypertension, cardiovascular disease, hyperthyroidism, or prostatic hypertrophy due to the vasoconstrictive properties of phenylephrine. It is contraindicated in individuals with known hypersensitivity to either component. The tablet should be administered as directed by a healthcare professional, typically once or twice daily, depending on the severity of symptoms. Patients are advised to avoid concomitant use with other sympathomimetic agents or CNS depressants. Overall, Levocet-D offers a convenient and effective therapeutic option for managing allergic symptoms with nasal congestion.