Hypromellose Acetate Succinate is widely used in the pharmaceutical industry as an enteric coating material for tablets and capsules. Its primary application lies in protecting active pharmaceutical ingredients (APIs) from the acidic environment of the stomach, ensuring they are released in the more neutral pH of the intestines. This property makes it particularly useful for drugs that are sensitive to stomach acid or that need targeted intestinal delivery. Additionally, it is employed in controlled-release formulations, where it helps regulate the dissolution rate of the drug, providing a sustained therapeutic effect. Its film-forming ability and compatibility with various excipients further enhance its utility in drug delivery systems.