Sustained-release refers to a method of delivering medication that allows it to be released slowly over time. This approach helps maintain a consistent level of the drug in the bloodstream, which can improve its effectiveness and reduce the frequency of doses needed. It is commonly used in various medications, including pain relievers and antidepressants. The design of sustained-release formulations often involves special coatings or matrix systems that control the rate at which the drug is released. This technique can enhance patient compliance, as individuals may prefer taking fewer pills throughout the day, leading to better overall treatment outcomes.