Zanocin OD 400mg Tablet ER contains Ofloxacin, a fluoroquinolone antibiotic effective against a broad spectrum of bacterial infections. Each extended-release tablet delivers 400mg of Ofloxacin, designed to maintain therapeutic plasma concentrations over an extended period, allowing once-daily dosing for improved patient compliance. Ofloxacin exerts its antibacterial action by inhibiting bacterial DNA gyrase and topoisomerase IV, enzymes essential for DNA replication, transcription, repair, and recombination, leading to bacterial cell death. Zanocin OD is indicated for the treatment of various infections caused by susceptible strains of bacteria, including respiratory tract infections, urinary tract infections, skin and soft tissue infections, and certain sexually transmitted infections. It is particularly useful in treating infections caused by Gram-negative and some Gram-positive organisms. Dosage should be individualized based on the severity of infection, renal function, and patient response. Caution is advised in patients with a history of hypersensitivity to fluoroquinolones, and use should be avoided during pregnancy and lactation unless clearly necessary. Common adverse effects may include gastrointestinal disturbances, headache, dizziness, and photosensitivity. Patients are advised to complete the full course of therapy to prevent resistance development. Zanocin OD 400mg Tablet ER should be used under medical supervision with appropriate microbiological guidance.