RecruitingPhase 1Drug trialPharmacokinetic Study of Single-Dose Modified Release Glipizide in Healthy VolunteersIn vivo drug dissolution in the gastrointestinal (GI) tract is largely unmeasured. The purpose of this clinical study is to evaluate the in vivo drug dissolution and systemic absorption of modified release formulations of the BCS Class II drug Glipizide by direct sampling of stomach and small intestinal luminal content, blood, urine and feces. Expanding current knowledge of drug dissolution in vivo will help to establish physiologically relevant in vitro models predictive of drug dissolution.