could add up to major savings. abc s paula faris has more. reporter: kerry and andrew from lake worth, florida are living on the edge. is this something that could ruin you financially? absolutely. we re worried about losing our home. reporter: like so many american families, they need and pay for several prescriptions every month, like blood pressure medicine, and kerry has crohn s disease. then their worst nightmare. their insurance company told them they won t cover all of it. now they re facing a $20,000 bill every month. are you guys afraid right now? yes. reporter: so we brought in michelle katz. tip one, check your bill like at a restaurant. believe it or not, there are codes for your drugs and often they get them wrong. we found one of those, fixed it and immediately saved them $1,200. tip two, arm yourself with this app called low rx. here s why. did you know drug prices fluctuate like gas prices?