Nano-lipid Gateways: A Modern Assessment of SMEDDS for Enhancing Oral Bioavailability of Insoluble Medications

Introduction: An increasing number of poorly water-soluble drug candidates simpliciter a significant obstacle in effective oral therapy through reduced bioavailability and erratic therapeutic outcomes. This review is aimed at identifying the application potential of Self-Microemulsifying Drug Delivery Systems (SMEDDS), a nano-lipid-based approach for improvement of oral bioavailability and therapeutic efficacy of insoluble drugs. Methods: The review describes the architectural and mechanistic aspects of SMEDDS on which SMEDDS are developed from traditional macroemulsions. The key components of formulation are discussed, as well as the mechanisms through which they enhance absorption (lymphatic transport, modulation of permeability, P-glycoprotein inhibition), and the advanced characterization tools such as droplet size analysis, zeta potential, and thermodynamic stability. The strategies for optimization via quality by design (QBD) and design of experiments (DOE) are also mentioned. Results: Studies in clinical or preclinical settings indicate the role SMEDDS play in the enhancement of pharmacokinetics, bioavailability, and patient compliance. Solid SMEDDS have better stability with targeted delivery. Conclusion: SMEDDS has provided the possibilities of being a versatile and promising platform for the oral administration of poorly soluble drugs and thus presents a significant role in personalized and precision medicine.