Tobramycin (Tobrex) is an antibiotic in the Aminoglycoside family. It is used topically to treat certain kinds of bacterial infections of the skin and eye.
Tobramycin is rarely used as a treatment for acne. Tobramycin has minimal activity against most gram-positive bacteria, a group which includes the acne-causing P. acnes bacterium. Laboratory testing has consistently confirmed that P. acnes bacteria are highly resistant to members of the Aminoglycoside antibiotic family. It is unlikely that Tobramycin will be an effective treatment for most individuals with acne.