In order to evaluate whether the dissolution advantage of the cocrystal can translate into an oral bioavailability strength, the in vivo bioavailability investigations were performed on INH-SYA cocrystal and physical mixtures of the INH and SYA (equimolar ratio). The serum concentration profiles are shown in Fig. 8, and its corresponding pharmacokinetic parameters determined by PKSolver software are illustrated in Table 1. It is evident from Fig. 8a that the SYA concentrationin the physical mixture showed very low plasma concentration, due to its poor solubility. However, the SYA contents in the cocrystal exhibited favorable pharmacokinetic profiles, revealing that the physicochemical properties of SYA have been optimized by playing the INH's advantages through cocrystal formation. The improved pharmacokinetic performances of the SYA in the INH-SYA cocrystal can be further proved by the parameters of pharmacokinetic listed in Table 1. It shows that the AUC and CMAX of SYA in INH-SYA cocrystal were 3.66-fold and 2.76-fold, respectively, which was significantly higher than those of SYA in the mixture. These observations indicated that the bioavailability of SYA has been effectively enhanced through cocrystal formation. Moreover, the TMAX of SYA in the cocrystal was advanced from 0.75 to 0.50 h, illustrating that the cocrystallization of INH with SYA can accelerate the absorption of SYA. On the other hand, as viewed from Fig. 8b and Table 1, although the peak of plasma concentration and the absorption rate of INH decreased due to cocrystal formation, the FREL still kept at 1.95. That means the bioavailability of INH in the cocrystal does not reduce affected by the decrease in its solubility, and has certain improvement, which may be because of the sustained release of the cocrystal. In summary, the INH-SYA cocrystal displayed optimized and synergistic in vivo pharmacokinetic properties contrast with the physical mixture, which created favorable conditions for overcoming the serious hepatotoxicity of INH as follows.
In order to evaluate whether the dissolution advantage of the cocrystal can translate into an oral <br>bioavailability strength, the in vivo bioavailability investigations were performed on INH-SYA <br>cocrystal and physical mixtures of the INH and SYA (equimolar ratio). The serum concentration <br>profiles are shown in Fig. 8, and its corresponding pharmacokinetic parameters determined by <br>PKSolver software are illustrated in Table 1. It is evident from Fig. 8a that the SYA concentration<br>in the physical mixture showed very low plasma concentration, due to its poor solubility. However, <br>the SYA contents in the cocrystal exhibited favorable pharmacokinetic profiles, revealing that the <br>physicochemical properties of SYA have been optimized by playing the INH's advantages through <br>cocrystal formation. The improved pharmacokinetic performances of the SYA in the INH-SYA <br>cocrystal can be further proved by the parameters of pharmacokinetic listed in Table 1. It shows that <br>the AUC and CMAX of SYA in INH-SYA cocrystal were 3.66-fold and 2.76-fold, respectively, <br>which was significantly higher than those of SYA in the mixture. These observations indicated that <br>the bioavailability of SYA has been effectively enhanced through cocrystal formation. Moreover, <br>the TMAX of SYA in the cocrystal was advanced from 0.75 to 0.50 h, illustrating that the <br>cocrystallization of INH with SYA can accelerate the absorption of SYA. On the other hand, as <br>viewed from Fig. 8b and Table 1, although the peak of plasma concentration and the absorption rate <br>of INH decreased due to cocrystal formation, the FREL still kept at 1.95. That means the <br>bioavailability of INH in the cocrystal does not reduce affected by the decrease in its solubility, and has certain improvement, which may be because of the sustained release of the cocrystal. In <br>summary, the INH-SYA cocrystal displayed optimized and synergistic in vivo pharmacokinetic <br>properties contrast with the physical mixture, which created favorable conditions for overcoming <br>the serious hepatotoxicity of INH as follows.
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