Purpose: To measure the solubility of four drugs in human gastric aspirates, canine gastric aspirates (CGF) and simulated gastric fluids in order to propose a medium for estimating intragastric drug solubility relevant to a bioavailability study in the fasted state.
Materials And Methods: Intragastric environment after administration of water to healthy fasted adults and to healthy fasted dogs (this study) was initially characterized. Solubilities were then measured with the shake-flask method in gastric fluid aspirated after the administration of water to healthy fasted adults and to healthy fasted dogs, in various simulated gastric fluids, i.