New Binary Adducts of Panobinostat with Different Carboxylic Acid Based NSAIDs: Structural Analysis and Physicochemical Properties Investigation

Abstract Adoption of multitarget, cost‐effective fixed‐dose medication combinations can help lower the pill load without increasing the risk of adverse events. In this study, three new 1:1 drug‐drug binary solid forms of panobinostat (PNB) and nonsteroidal anti‐inflammatory drugs (NSAIDs) were effectively synthesized by liquid‐assisted grinding and slow evaporation crystallization techniques. The obtained solid forms were extensively characterized by various analytical techniques. The structural investigation revealed that all molecular adducts formed salt with a comparable (10) graph set pattern created by heteromeric interactions formed between PNB and corresponding salt formers. To determine the dissolving behavior of the newly developed adducts, solubility tests were performed at various pH levels (pH 1.2 and pH 7), and the results indicated that the solubility of all forms is increased at pH 7.0, particularly PNB.NIF has a solubility of 0.195 mg/mL, which is seven times higher than the parent drug. Furthermore, PXRD was used to assess the stability of the synthesized adduct at varied temperature and humidity levels and it was found that all the adducts are stable. Based on the findings, we hope that the newly found PNB drug‐drug binary adducts have possible potential to broaden the use of drug combinations without changing the chemical structures.