Zymar Eye Drop contains Gatifloxacin 0.3% w/v, a broad-spectrum fluoroquinolone antibiotic indicated for the treatment of bacterial infections of the eye. Gatifloxacin exhibits potent bactericidal activity by inhibiting bacterial DNA gyrase and topoisomerase IV, enzymes essential for bacterial DNA replication, transcription, repair, and recombination. Zymar Eye Drop is primarily prescribed for bacterial conjunctivitis and corneal ulcers caused by susceptible strains of gram-positive and gram-negative bacteria. The formulation ensures rapid penetration into ocular tissues, providing effective antimicrobial concentrations at the site of infection. It is administered topically, typically one drop instilled into the affected eye(s) every two hours while awake for the first two days, followed by one drop every four hours for the next five days, or as directed by a healthcare professional. Adverse effects are generally mild and may include transient ocular discomfort, burning, or stinging upon instillation. Patients should avoid contact lens use during treatment unless otherwise advised. Zymar Eye Drop should be used with caution in individuals with a history of hypersensitivity to fluoroquinolones. Proper hygiene and adherence to the prescribed regimen are essential to prevent resistance development and ensure therapeutic efficacy.