Mastowell 20mg Tablet contains Bilastine, a non-sedating second-generation antihistamine indicated for the relief of symptoms associated with allergic rhinitis and chronic urticaria. Bilastine acts as a selective antagonist of peripheral H1 histamine receptors, effectively reducing the effects of histamine released during allergic reactions. This medication is commonly prescribed to alleviate nasal congestion, sneezing, rhinorrhea, and itching of the nose and throat, as well as skin manifestations such as hives and itching. Mastowell 20mg offers a favorable safety profile with minimal central nervous system penetration, thereby reducing the risk of sedation and cognitive impairment often associated with first-generation antihistamines. The recommended dosage for adults and adolescents aged 12 years and above is one 20mg tablet taken orally once daily, preferably on an empty stomach to enhance absorption. Bilastine is rapidly absorbed, with peak plasma concentrations achieved within 1 hour post-administration, and has a half-life conducive to once-daily dosing. Caution is advised in patients with severe renal impairment, and concurrent use with certain fruit juices may reduce its bioavailability. Mastowell 20mg should be used under medical supervision, and patients are advised to follow prescribed dosing instructions to ensure optimal therapeutic outcomes.