Nanosuspensions in Drug Delivery: Strategic Formulation, QbD Integration, and Overcoming Biopharmaceutical Barriers

Nanosuspensions offer a promising strategy to resolve solubility and bioavailability challenges often encountered with modern pharmaceutical actives. This review describes core formulation principles, highlights the mechanistic underpinnings of nanosuspension technology, and examines advances in stabilization and scalable manufacturing. The integration of Quality by Design (QbD) is explored, illustrating how systematic risk assessment and process control enhance product reliability and regulatory readiness. Overcoming key biopharmaceutical barriers—such as physical stability, dissolution rate, and patient compliance—is discussed using illustrative case studies from both oral and non-oral drug delivery applications. The synthesis of recent research trends provides guidance on how nanosuspensions can be strategically positioned to improve therapeutic outcomes and accelerate clinical translation.