Everyone knows drug prices are going up, but it is hard to find specific data showing just how fast some individual prices are rising. In a breakthrough analysis, Bloomberg tracked down historical data for all big-selling brand name drugs in the U.S. and found dozens whose price had doubled in just seven years. As a result of the soaring prices, we found that patients increasingly encounter tough measures by insurers, including outright bans. In some cases, the prices are so high – $5,000 a month or more – that patients who are covered still can’t afford copays that are based on a percentage of the price.