A Review Analytical Advances and Challenges in Quality Control Techniques for Corticosteroid Ophthalmic Suspensions

Ophthalmic suspensions, particularly corticosteroid formulations, require stringent quality control (QC) measures to ensure their stability, therapeutic efficacy, and safety for patient use. Key physicochemical parameters, such as viscosity, rheological properties, pH, and osmolality, are vital in maintaining the desired characteristics of the suspension. Particle size distribution (PSD) is particularly critical, influencing both the stability and bioavailability of the active pharmaceutical ingredient (API). In addition, chemical parameters such as the assay of the API using High-Performance Liquid Chromatography (HPLC) and impurity analysis help ensure the purity and potency of the formulation. Microbiological testing, including sterility and antimicrobial effectiveness testing (AET), ensures that the product is free from microbial contamination and that preservatives remain effective throughout the shelf life. Advanced techniques like Liquid Chromatography-Mass Spectrometry (LC-MS) are employed to detect impurities and profile metabolites, supporting the drug development process. Stability testing under various conditions is conducted to assess the product’s shelf life and long-term performance. Homogenization techniques, such as high-shear mixing, ultrasonication, and pressure homogenization, are used to ensure particle uniformity, enhancing product stability and therapeutic consistency. This paper discusses the importance of these QC parameters in the development of corticosteroid ophthalmic suspensions and highlights the methods used to ensure product quality, safety, and effectiveness.