Ginny started having a red and tearing eye after working in the yard. It didn't get better with time so we were off to the optometrist for an examination. Turns out she scratched the cornea and needed some antibiotics. So we got this 2.5 milliliter bottle of Tobramycin and Dexamethasone. These goodies are not water soluble so you have to give the container an effective shake before dispensing. If you do the math, the total weight of active ingredients in the bottle is ten milligrams. If you put it all in one place you could hardly see it. This stuff was only five dollars because the patents had long ago expired.