Hydroxyethyl starch（HES）200/0.5, formed by acid-hydrolyzed and hydroxyethylized high-branched chain amylopectin starch, is a medium MW and low molar substitution ratio HES. Its chemical formula is poly (O-2-hydroxyethyl) starch, and the common name is HES200/0.5 (Penta starch).
HES solution has quick effect and strong volume expansion properties; it can maintain four hours’ middle strength expansion; it can be cleared away from kidney; less accumulation in plasma and tissue, least effect on coagulation; it can improve microcirculation.

HES 200/0.5 solution is a popular plasma substitute in Europe, and is the preferred remedy in curing and de ng deficient blood volume and shock.