Multiple dose pharmacokinetics of fiduxosin under fasting conditions in healthy elderly male subjects

Comparison of methods for chemical-compound affinity prediction

The selection of effective features from various descriptors of chemical compounds and the exploitation of the most appropriate classifier is a momentous issue in improving overall accuracies of virtual screening of chemical compounds. In this article, the performance of various feature-selection methods and various classifiers of chemical compound-protein binding affinities are compared by using six series of compounds: cytochrome P450 2C9 inhibitors, multi-drug-resistance reversal compounds, estrogen receptor ligands, inhibitors of human ether-a-go-go-related genes, and ligands of serotonin receptor 5HT1A and 5HT2A. As a result, it was found that the genetic algorithm was superior to the other feature-selection methods, and its combination with Random Forests and Adaboosts or Baggings gave almost the same performance as support-vector machines and was superior to the other classifiers. The precision and recall of these methods were almost the same or ascendant to those of previous work. The automatically selected descriptors for each protein-compound affinity prediction were plausible and would be informative to interpret the resulting model.

Effect of food on the pharmacokinetics of fiduxosin in healthy male subjects

The effect of food on the pharmacokinetics of fiduxosin, a novel selective alpha1a-receptor antagonist, was determined in healthy male subjects. This was a Phase I, open-label, single-center, randomized, two-period, crossover, single oral dose study of fiduxosin. Healthy male subjects (N= 14) were administered single oral doses of 30 mg of fiduxosin under fasting or nonfasting (1026 Kcal, 54 g fat, 46% calories from fat) conditions in each period. Fiduxosin plasma concentration profiles were used to assess fiduxosin pharmacokinetics. The mean Cmax, Tmax, AUC(infinity), CL/F and Vbeta/F values under fasting and nonfasting conditions were 34.3 and 150 ng/mL, 5.4 and 5.4 h, 822 and 1940 ng x h/mL, 42.5 and 17.2 L/h, and 924 and 235 L, respectively. The harmonic mean t 1/2 under fasting and nonfasting conditions were 13.9 and 9.28 h, respectively. Food significantly increased the bioavailability of fiduxosin. Under the nonfasting regimen, the Cmax central value was more than 4-fold and the AUC(infinity) central value more than 2-fold the central value of the fasting regimen. Tmax was not significantly different between fasting and nonfasting regimens. Food also decreased fiduxosin oral clearance (CL/F) by 60% and volume of distribution (Vbeta/F) by 75%.