drug absorption Article 13 human 13 controlled study 12 nonhuman 10 Humans 9 drug bioavailability 7 drug structure 6 in vitro study 6 male 6 Animals 5 chemistry 5 drug release 5 drug solubility 5 priority journal 5 unclassified drug 5 animal 4 animal experiment 4 drug delivery system 4 drug distribution 4 drug effect 4 drug formulation 4 drug metabolism 4 drug stability 4 female 4 molecular docking 4 Administration, Oral 3 Drug Delivery Systems 3 IC50 3 Male 3