Laboratory Performance Testing of Nasal Inhalation Products

This white paper discusses the laboratory performance testing methodologies for aqueous nasal inhalation products, focusing on the assessment of droplet and particle size distribution (APSD). It highlights the complexities involved in characterizing these products for quality control and bioequivalence assessments, particularly due to the large droplet sizes and the presence of solid excipient particles. The paper outlines various methodologies for assessing APSD, including laser diffraction and Morphology Directed Raman Spectroscopy, while addressing their limitations and the need for alternative methods. The review emphasizes the importance of understanding the limitations of characterization instruments and the assumptions governing data interpretation. Additionally, it raises awareness of the regulatory applications for droplet size analysis, as well as the evolving techniques necessary for accurate measurement. The paper aims to provide a comprehensive understanding of the methodologies and regulatory requirements surrounding the assessment of nasal inhalation products.