Linezolid has been studied as an alternative to vancomycin in the treatment of febrile neutropenia in cancer patients when Gram-positive infection is suspected.  It is also one of few antibiotics that diffuse into the vitreous humor , and may therefore be effective in treating endophthalmitis (inflammation of the inner linings and cavities of the eye) caused by susceptible bacteria. Again, there is little evidence for its use in this setting, as infectious endophthalmitis is treated widely and effectively with vancomycin injected directly into the eye . 
Some of the approved drugs are synthetic versions of the natural hormones, such as trenbolone acetate and zeranol. Just like the natural hormone implants, before FDA approved these drugs, FDA required information and/or toxicological testing in laboratory animals to determine safe levels in the animal products that we eat (edible tissues). Furthermore, FDA required that the manufacturers demonstrate that the amount of hormone left in each edible tissue after treatment is below the appropriate safe level. As described above, a safe level is a level which would be expected to have no harmful effect in humans.
Steroid and antibiotic eye drops - hydrocortisone/neomycin/polymixin B; loteprednol/tobramycin; prednisolone/gentamycin; prednisolone/sulfacetamide; hydrocortisone /neomycin/bacitracin/ polymyxin B (Blephamide, Catapred [discontinued], Isopto, Pred-G, Poly-Pred [discontinued], Tobradex, Zylet and many other brands) are steroid and antibiotic eye drops prescribed to prevent or treat eye infections that are associated with inflammation. Side effects, drug interactions, dosage, and pregnancy safety information should be reviewed prior to using these medications.