Abstract
The conditions and mechanisms leading to stability differences between ceftriaxone sodium products were examined to ensure drug quality and efficacy. We used a combination of powder X-ray diffraction and thermogravimetric analysis to examine the differences between preparations for injection from different pharmaceutical processes to elucidate the changed processes by exposing samples to different humidity and high-temperature conditions. Water loss or absorption due to varying environmental humidity levels did not adversely affect the crystal structure, but could lead to the reversible redistribution of hepta-hydrate in the unit cell of generic products, causing its stability change. The irreversible distribution of hydrate may occur when generic drugs stored at 25 °C, whereas the brand-name products remained stable at 40 °C. Therefore, generic ceftriaxone sodium and its powder preparations would be acceptable by better controlled sealing and storing under cool conditions during storage period to meet the efficacy and stability.
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