Dex, known generically as Hydroxyethyl Starch 200/0.5 Sodium Chloride Injection, acts as a plasma volume expander. Hydroxyethyl Starch 200/0.5 Sodium Chloride Injection is used for:Treatment and prevention of hypovolemia or shock due to the following causes (surgery, hemorrhagic shock, traumatic shock, infectious shock, burn shock). Reducing the need for blood supply and saving blood during surgery (acute isovolumetric hemodilution). Therapeutic hemodilution. Adverse reactions to Hydroxyethyl Starch 200/0.5 Sodium Chloride Injection include: allergic reactions, such as eyelid edema, urticaria and asthma; tachycardia with or without drop in blood pressure, vertigo, nausea, vomiting; shock or bronchospasm. It should be inputted slowly when used, meanwhile, observe the patient closely, find the adverse reaction and treat the symptom in time. Hydroxyethyl Starch 200/0.5 Sodium Chloride Injection should be contraindicated in the following cases: severe congestive heart failure; renal failure and renal failure; cerebral hemorrhage; severe coagulation disorders; fluid overload or severe fluid deficiency; starch allergy. In view of the scope of use and adverse reactions of hydroxyethyl starch 200/0.5 sodium chloride injection, it is recommended that it be used under the observation of a physician in a regular hospital.