Sodium carboxymethyl starch is a dextrin derivative obtained by chemically modifying starch. It has good solubility and colloidal properties and can form stable inclusion complexes with drug molecules. This inclusion complex can slow down the release rate of the drug and improve the drug's solubility and bioavailability. Therefore, sodium carboxymethyl starch is widely used in the pharmaceutical industry.

　　Sodium carboxymethyl starch plays an important role in controlled-release drugs. By combining the drug with sodium carboxymethyl starch, the release rate of the drug in the body can be controlled, thereby prolonging the drug's efficacy. This is very beneficial for treatments that require long-term maintenance of drug concentration, such as chronic pain management and the treatment of chronic diseases. The controlled-release properties of sodium carboxymethyl starch help reduce frequent drug administration, improving the safety and convenience of treatment.

　　Sodium carboxymethyl starch is also used to improve drug solubility. Some drugs, due to their special chemical structure, are difficult to dissolve in water, resulting in poor efficacy. By forming inclusion complexes with sodium carboxymethyl starch, the solubility of the drug in water can be improved, and its bioavailability can be enhanced. This is of great significance for drug research and development and formulation improvement, allowing drugs that were originally difficult to use to better exert their effects.

　　Sodium carboxymethyl starch is also widely used in various drug dosage forms, including oral preparations, injections, and external preparations. It can increase drug stability, improve the rheological properties of the preparation, and improve drug bioavailability. This allows the drug to better meet the needs of patients and improve treatment efficacy.

　　In summary, the importance of sodium carboxymethyl starch in pharmaceutical dextrins cannot be ignored. Through its role in controlled drug release, improved drug solubility, and enhanced drug bioavailability, it provides strong support for drug research and development and formulation improvement. In the future, with the advancement of science and technology, the application of sodium carboxymethyl starch in the pharmaceutical field will become more extensive and in-depth.