Similar. The two medicines are both considered viscosupplementation. They are injected for mild-moderate arthritis to improve the lubrication of the joint, more normally recreate the viscosity of knee joint fluid, and hydrate the remaining cartilage. Synvisc (hylan g-f 20) can be given in a one time dose or 3 doses separated by a week each. Hyalgan, euflexxa, orthovisc, supartz are given in multiple doses (3-5).
Similar. These are similar products made by competing companies.