A Thorough Analysis of Natural Polymers as Functional Excipients in Contemporary Pharmaceutical Formulations

Natural polymers' innate biocompatibility, biodegradability, and environmental friendliness have made them attractive functional excipients in contemporary pharmaceutical formulations. This study emphasizes the importance of natural polymers-such as starch, cellulose, alginate, chitosan, gelatin, and xanthan gum-derived from plant, animal, and microbial sources in the creation of cutting-edge drug delivery methods. These polymers have a variety of physicochemical characteristics, including swelling, viscosity, gel-forming capacity, and mucoadhesion, all of which are essential for regulating drug release, boosting stability, and increasing bioavailability. Natural polymers are appealing substitutes for synthetic excipients in pharmaceutical applications because they provide benefits such lower toxicity, sustainability, and cost-effectiveness. The categorization, origins, and functional roles of natural polymers in biological, pharmacological, and environmental applications are also covered in the review. Their use in targeted delivery, hydrogels, nanoparticles, controlled and sustained drug delivery systems, and gene delivery systems is highlighted. Additionally, recent advancements including the invention of stimuli-responsive polymers, chemical modification, and the integration of nanotechnology have significantly enhanced their functionality and broadened their applications. Despite its advantages, challenges like unpredictability, microbial contamination, and regulatory difficulties require standardization and advanced processing techniques. All things considered, natural polymers provide a versatile and durable foundation for the development of innovative drug delivery systems, improving patient compliance and therapeutic outcomes in modern pharmaceutical sciences. Keywords: Mucoadhesion, biocompatibility, controlled drug delivery, pharmaceutical excipients, natural polymers, and biodegradability