When a drug is likely to cause a severe side effect--say, an increased risk of heart attack, an allergic reaction that causes the skin to burn or liver failure--the standard practice is to warn patients and doctors about the product's labeling, and to send out warning letters to physicians who might prescribe the medicine.
Toyota's 2014 Tundra pickup will come with a standard backup camera, and an optional blind-spot system that can warn a Tundra driver when a car is about to pass.