Co-crystal of Tramadol Hydrochloride–Celecoxib (<b>ctc</b>): A Novel API–API Co-crystal for the Treatment of Pain
作者:Carmen Almansa、Ramon Mercè、Nicolas Tesson、Joan Farran、Jaume Tomàs、Carlos R. Plata-Salamán
DOI:10.1021/acs.cgd.6b01848
日期:2017.4.5
We have identified a co-crystal of tramadol hydrochloride–celecoxib (ctc; E-58425/MR308), a novel active pharmaceutical ingredient (API)–API co-crystal formed by an intrinsic 1:1 molecular ratio of rac-tramadol·HCl and celecoxib, which displays favorable physicochemical and dissolution profiles. Adequate treatment of pain represents an unmet medical need that is often addressed via combination therapy. API–API co-crystals represent a new approach with potential to improve physicochemical properties, bioavailability, stability, or formulation capacity, which may translate into optimized pharmacokinetic profiles and clinical benefits compared with individual APIs or their combination. ctc showed a well-defined differential scanning calorimetry profile, and its single-crystal X-ray diffraction structure demonstrated a supramolecular 3D network in which the two active enantiomers of tramadol and celecoxib are linked via hydrogen bonding and chloride ions. Oversaturation studies indicated that the saturation effect for highly insoluble celecoxib occurred at a higher concentration in ctc than in celecoxib alone. Comparative intrinsic dissolution rate studies showed that the release of celecoxib was faster, and the release of tramadol was slower, from ctc than from the individual APIs, predicting an improved pharmacokinetic behavior for ctc. Together with findings from preclinical studies, these data support the clinical development of ctc for the treatment of pain.
我们发现了一种盐酸曲马多-塞来昔布共晶体(ctc;E-58425/MR308),这是一种新型活性药物成分(API)-API 共晶体,由 rac-tramadol-HCl 和塞来昔布以固有的 1:1 分子比形成,具有良好的理化和溶解特性。充分治疗疼痛是一项尚未得到满足的医疗需求,通常通过联合疗法来解决。API-API 共晶体是一种新方法,具有改善理化性质、生物利用度、稳定性或配制能力的潜力,与单个 API 或其组合相比,可转化为优化的药代动力学特征和临床益处。ctc 显示了明确的差示扫描量热曲线,其单晶 X 射线衍射结构显示了超分子三维网络,其中曲马多和塞来昔布的两种活性对映体通过氢键和氯离子连接在一起。过饱和研究表明,与单独使用塞来昔布相比,ctc 中的浓度越高,高度不溶性塞来昔布的饱和效应就越大。比较内在溶解速率研究表明,与单个原料药相比,ctc 中塞来昔布的释放速度更快,而曲马多的释放速度更慢,这预示着ctc 的药代动力学行为有所改善。结合临床前研究的结果,这些数据支持用于治疗疼痛的 ctc 的临床开发。