From:  Bioinspired anesthetic delivery systems: bridging pain management and regenerative medicine

 Key platform, their enabling mechanism, advantages, limitations and clinical status.

PlatformMechanismKey advantagesKey limitationsClinical statusReferences
LiposomesMultivesicular encapsulationLong duration (up to 72 h), reduced systemic exposureHigh cost, inconsistent release, and manufacturing scalabilityFDA-approved (EXPAREL®)[7]
HydrogelsLocalized polymer depotLocalized delivery, customizable release profilesBurst release, mechanical instability, high variability in formulationPre-clinical/early clinical[3]
Nanoparticles (PLGA)Polymeric matrix erosionControlled release, enhanced drug stability, reduced systemic exposureLack of clear in vitro-in vivo correlation, manufacturing challengesEarly clinical/FDA-approved (Posimir™, Zynrelef™)[4]