Compounded iron dextran 70 is a compounded eye drop that contains mainly iron dextran 70 and carboxymethylcellulose. The drug is an eye drop that mainly acts as a treatment for dry eyes. The relative molecular weight of iron dextran 70 is similar to that of human albumin, which has the effect of increasing plasma osmolarity, increasing blood volume and maintaining blood pressure, and can depolymerize aggregated platelets to prevent the formation of blood clots. Carboxymethyl cellulose is part methyl and part polyhydroxypropyl ether of cellulose, which can be dissolved in cold water to form a solution with certain viscosity, and its property is close to the viscoelastic substance in tears, so it can be used as an artificial tear solution. The compound preparation composed of these two drugs can simulate the natural tearing eye, so the drug mainly serves to nourish the eye and eliminate the discomfort of the eye, and is mainly used for the treatment of dry keratitis and dry eye.