Tobrex Tobramycin Eye Ointment 0.3%, 3.5 mg TubeTobex Tobramycin Eye Ointment 0. 3% is a prescription medication used to treat bacterial eye infections. It contains the active ingredient tobramycin, which belongs to a class of antibiotics called aminoglycosides. This ointment works by stopping the growth of bacteria in the eye, thereby treating the infection. Tobex Tobramycin Eye Ointment 0. 3% is typically prescribed for conditions such as conjunctivitis, keratitis, and blepharitis. It is applied