Controlled drug delivery systems, improve patient compliance and therapeutic outcomes, have transformed the pharmaceutical industry. This review article will concentrate on the design principles, applications, and potential benefits of controlled drug delivery systems in order to provide a thorough overview of current advancements in the field. The introduction of the essay reviews the fundamental concepts of controlled drug delivery and emphasizes how important it is to accomplish targeted and sustained medication release. Then, a number of drug delivery strategies based, among others, on polymers, liposomes, nanoparticles, and implant are looked at. The design, production, and release mechanisms of each system are all covered