Design and Application of Hydrogels as Drug Carriers in Modern Pharmaceutics: A Comprehensive Review

Abstract

Hydrogels are emerging as versatile materials for advanced drug delivery systems, offering significant advantages in controlled and sustained drug release. These polymeric networks are highly biocompatible, biodegradable, and capable of encapsulating both hydrophilic and hydrophobic drugs, making them ideal for a wide range of pharmaceutical applications. This review explores the types of hydrogels, including natural (Chitosan, Sodium Alginate) and synthetic (PEG, PVA) polymers, and their mechanisms of drug release, such as diffusion-controlled, swelling-controlled, and stimuli-responsive release systems. The paper also highlights the applications of hydrogels in oral, topical, injectable, ocular, and cancer drug delivery, emphasizing their ability to improve therapeutic efficacy, enhance patient compliance, and reduce side effects. Furthermore, the challenges related to drug loading efficiency, stability, scalability, and regulatory hurdles are discussed. The review concludes with a reflection on future trends, including smart hydrogels, hybrid and nanocomposite systems, 3D printing for personalized drug delivery, and the role of hydrogels in personalized medicine. These innovations hold the potential to revolutionize drug delivery systems and provide more effective and tailored treatments for various diseases.

Keywords: Hydrogels, Drug Delivery Systems, Smart Hydrogels, Personalized Medicine, Sustained Release.