Five years ago, Kiah Williams, then 24, and two other young Stanford University graduates started devoting their nights and weekends to launching a startup. The trio wanted to help low-income patients gain access to expensive prescription drugs. The nonprofit that they created is called SIRUM (Supporting Initiatives to Redistribute Unused Medicine), which they describe as a "Match.com for unused medicine." Ms. Williams, who was then working at the Clinton Foundation, co-founded the group with Adam Kircher, a former McKinsey consultant, and neurobiologist George Wang. Using an online platform, SIRUM connects facilities that serve low-income patients with inventories of unused, unexpired prescription medications. [Subscription Required]