Hydrogel Drug Delivery Systems and Liposomal Bupivacaine: Innovations and Future Perspectives in Pain Management.

Pain management remains a major clinical challenge, as conventional opioids and local anesthetics suffer from short analgesic duration, systemic toxicity, and dependence risks. Advanced drug delivery systems, particularly hydrogels and liposomal bupivacaine, have emerged as promising solutions to address these limitations. Hydrogels, composed of cross-linked hydrophilic polymer networks, enable biocompatible, biodegradable, and sustained drug release, while liposomal bupivacaine encapsulates the anesthetic within lipid vesicles to prolong local analgesia and minimize systemic toxicity. The combination of these systems offers synergistic benefits, including extended drug retention, enhanced efficacy, and reduced opioid reliance. However, clinical translation remains constrained by formulation instability, high production costs, variable patient responses, and stringent regulatory requirements. This review provides a comprehensive overview of current advances in hydrogel and liposomal bupivacaine technologies, highlighting their clinical potential, ongoing challenges, and future directions toward safer, more effective, and personalized pain management strategies.