The cost of prescription drugs increased by 8.77% in 2016, according to data from the Truveris National Drug Index. Over the past 3 years, annual price increases have increased by an average of 9.98%, the report notes. The National Drug Index is a weighted price index that measures the average price of prescription drugs in the United States, and is driven by the most commonly prescribed medications. The report also found the price of branded drugs increased by 12.92% in 2016, while the price of specialty drugs increased by 7.93%. The price of generic drugs increased by 0.32%. The new year has not resulted in lower drug prices, Truveris finds: for the first quarter of 2017, drug prices continued to outpace general inflation, increasing 2.33%.