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The powder properties of two 1,4-dihydropyridine type compounds, manidipine dihydrochloride (Man) and benidipine hydrochloride (Ben), which possess similar physicochemical properties, were compared through thermal and mechanical analyses. Man and Ben were compressed with lactose monohydrate (Lac) and magnesium stearate (Mgst) at different compression forces. As an index, we focused on the onset temperatures of Lac dehydration during thermal analysis and plotted them against compression forces to evaluate the differences in powder properties between Man and Ben. To discuss in detail, the Lac ratio was selected as a formulation factor and compression speed as a process factor, which would be influenced to the onset temperature or its profile. It could be represented that Man was more adherent than Ben through thermal analysis by changing these critical factors, which were consistent with the results obtained through mechanical analysis.

Differences in Powder Properties of Two 1,4-Dihydropyridine-Type Compounds Evaluated through Thermal Analysis