“…Pharmaceutical formulations typically have well-defined APIs and excipients. Due to its inherent specificity, Raman imaging has shown to be useful in the analysis of solid pharmaceutical samples and the classification of different APIs and their structures. − Importantly, Raman can also be used to characterize chemically identical forms of an API that differ in their crystalline lattice structures or molecular conformations, known as polymorphs. Polymorphism plays an important role in drug dissolution, thermodynamic stability, and API bioavailability. , Grand et al developed a fast Raman imaging technique using compressive sensing for rapid characterization and mapping of clopidogrel polymorphs and three excipients in tablets with a pixel dwell time of 2.5 ms .…”