Zostum-O 200mg Tablet contains Cefditoren, a third-generation oral cephalosporin antibiotic effective against a broad spectrum of Gram-positive and Gram-negative bacteria. It is primarily indicated for the treatment of respiratory tract infections such as community-acquired pneumonia, acute exacerbations of chronic bronchitis, and pharyngitis/tonsillitis caused by susceptible strains. Cefditoren exerts its bactericidal action by inhibiting bacterial cell wall synthesis, leading to cell lysis and death. The 200mg dosage is designed for optimal efficacy while minimizing adverse effects. Zostum-O is well-absorbed orally, with peak plasma concentrations achieved within 2-3 hours post-administration. It is generally well-tolerated; however, common side effects may include gastrointestinal disturbances such as diarrhea, nausea, and abdominal pain. Hypersensitivity reactions, although rare, may occur in patients with a history of penicillin or cephalosporin allergy. Caution is advised in patients with renal impairment, and dosage adjustments may be necessary. Zostum-O should be used strictly according to susceptibility patterns to reduce the risk of resistance development. It is contraindicated in individuals with known hypersensitivity to cephalosporins. Proper adherence to the prescribed regimen is essential to ensure therapeutic success and prevent recurrence or resistance.