Abstract

Controlled release drug delivery systems have transformed modern pharmacotherapy by addressing the inherent limitations of conventional dosage forms, including poor bioavailability, fluctuating plasma drug levels, and reduced patient adherence. Through the ability to precisely control medication release rates, durations, and target sites, these systems minimize systemic toxicity while increasing therapeutic efficacy. This study highlights the increasing importance of controlled release technologies in modern drug delivery by offering a targeted and historical summary of their development, formulation advancements, and clinical uses. The fundamentals of regulated drug release, including diffusion, degradation, and stimulus-mediated mechanisms, are described in the article. In order to achieve consistent and longlasting drug profiles, it also looks at important formulation techniques, highlighting the function of biocompatible polymers, particle carriers, and depot-based systems. Recent developments in smart delivery systems and nanotechnology are examined, with a focus on stimuli-responsive systems that can modify medication release in response to environmental or physiological cues. These developments have broadened the range of applications for controlled release, making it possible to treat complicated illnesses including cancer, long-term metabolic disorders, and localized diseases more successfully. In addition to therapeutic benefits, the review critically addresses current challenges related to formulation complexity, biological barriers, scalability, and regulatory translation. Emerging trends, including personalized delivery systems and next-generation biomaterials, are explored as promising pathways for overcoming these limitations. By integrating formulation science with clinical needs, controlled release systems continue to redefine drug delivery paradigms. This review aims to provide researchers, formulators, and clinicians with a clear and insightful synthesis of progress in the field, while outlining future directions that will shape the next generation of controlled drug delivery technologies..

Keywords:Controlled drug delivery; Controlled release systems; Drug formulation; Nanocarriers; Stimuli-responsive delivery; Therapeutic application