Muro 128® Hypertonicity Agent, 0.5 OunceMuro 128 is a 5% sodium chloride hypertonicity ophthalmic solution (hypertonic meaning having a higher osmotic pressure than a surrounding medium or a fluid under comparison): Its intended use is for temporary relief of corneal edema Contents of half ounce bottle is sterile until opened and contains no mercurial compounds such as Thimerosal