Tobrex is a prescription eye medication for the treatment of certain types of eye infections. Eye infections can be viral, bacterial, or fungal. Tobrex is an antibacterial that treats infections from bacteria. Tobrex works by blocking the creation of bacterial proteins. Proteins are necessary for life, and blocking their synthesis kills the infective bacteria. Fact Table Formula C18H37N5O9 License EU EMA, US FDA Bioavailability 11.7% Legal status Rx Only Chemical Name Tobramycin Elimination half-life 2–3 hrs Dosage (Strength) 0.3% Pregnancy Consult Doctor Brands Nebcin, Tobrex, Tobi Protein binding Not bound PubChem CID 36294 MedlinePlus a682660 ChEBI 28864 ATC code J01GB01 DrugBank DB00684 KEGG D00063 Routes of administration IV, IM, inhalation, eye drops/ointment