OcuBright Tear Stains Remover diminishes tear stains in dogs and cats. It’s a once-a-day, pre-measured, chewable, soft, palatable real beef snack.The active ingredient is tylosin, which is a natural antibiotic made by bacteria. It is an organic base that is moderately bound by serum proteins (30 to 40 percent) and possesses a high degree of lipid solubility. Tylosin is comparatively nontoxic and effective in very low dosage. OcuBright Tear Stains Remover is not intended to treat or prevent disease or affect the structure or function of animals. It is a grooming aid for dogs and cats.