NPR Pharmaceuticals Correspondent Sydney Lupkin joins us to talk about a dad who learned his daughter needed an expensive drug — but there was a nearly identical one that was thousands of dollars cheaper. It's part of NPR's Bill of the Month series, which is done in partnership with Kaiser Health News. Follow Emily and Sydney on Twitter. They're @EmilyKwong1234 and @slupkin. Email the show at shortwave@npr.org.