Ciprofloxacin 0.3% w/v ophthalmic solution is a broad‑spectrum antibiotic eye drop used to treat bacterial infections of the eye, such as conjunctivitis (pink eye) and corneal ulcers. It belongs to the fluoroquinolone class of antimicrobials and works by inhibiting bacterial DNA gyrase, an enzyme essential for DNA replication, transcription, and repair, thereby stopping bacterial growth.