본 발명은 타달라필 공결정(cocrystal), 이의 제조방법 및 용도에 관한 것으로, 구체적으로 타달라필과 코포머(co-former)와의 상호작용을 통해 형성된 공결정으로서, 상기 코포머는 카페인(caffeine), 요소(urea), 사카린(saccharin), 및 말론산(malonic acid)으로 구성된 군으로부터 선택되는 하나 이상일 수 있다. 본 발명에 따른 타달라필 공결정은 타달라필보다 향상된 용출 프로파일을 나타내어, 균일한 품질 및 일정한 작용효과를 확보할 수 있게 하고, 위장관 내에서 빠르게 용해되어 그 결과 생체이용율의 증가로 인하여 대상 질환의 치료에 있어 유용하다.
Tadalafil–Malonic Acid Cocrystal: Physicochemical Characterization, pH-Solubility, and Supersaturation Studies
作者:Manishkumar R. Shimpi、Amani Alhayali、Katie L. Cavanagh、Naír Rodríguez-Hornedo、Sitaram P. Velaga
DOI:10.1021/acs.cgd.8b00362
日期:2018.8.1
The purpose of this study was to enhance the solubility and dissolution of a poorly water-soluble drug, tadalafil (TDF), by cocrystal formation with malonic acid (MOA), to characterize the cocrystal structure and to quantify the cocrystal solution behavior. The crystal structure revealed a 1:1 stoichiometry, wherein the TDF molecules form a double layered structure through N–H···O═C interactions linked to a catemeric chain of MOA molecules via O–H···O hydrogen bonds. Cocrystal solubility advantage (SA defined as Scocrystal/Sdrug) or supersaturation index was determined from eutectic point measurements to be 102 to 129 in the pH range of 1 to 3. Cocrystal dissolution generated supersaturation levels (Cmax/Sdrug) of 30 in buffer and 120 in the presence of a nucleation inhibitor, HPMC. The amorphous form of TDF generated supersaturation three times lower than cocrystal in buffer, and not significantly different from cocrystal in the presence of HPMC. Thus, supersaturation index is a valuable metric for assessing the risk of cocrystal conversion during kinetic studies and for predicting conditions when the usage of a precipitation inhibitor may significantly increase cocrystal exposure levels.