After Martin Shkreli raised the price of anti-parasitic drug Daraprim more than 50-fold to $750 a pill last year, he said he wasn't alone in taking big price hikes. The former drug executive was right. A survey of about 3,000 brand-name prescription drugs found that prices more than doubled for 60 and at least quadrupled for 20 since December 2014. Skyrocketing prices are getting increased scrutiny ahead of a U.S. congressional hearing this week: Democratic Representative Elijah Cummings, ranking member on a committee that is probing drug pricing, said Tuesday that pricing tactics are not limited to a few 'bad apples,' but are prominent throughout the industry." The cost of many drugs [rises] at annual rates of more than 10 percent. Drugmakers raised the prices of products as wide-ranging as erectile dysfunction drug Viagra, heart treatments, dermatology medicine and even brands that long have lost their patents. While specialty companies have had the steepest hikes, giants such as Pfizer Inc. and GlaxoSmithKline Plc kept pushing through smaller rises. About 400 formulations of brand-name drugs went up at least 9.9 percent since early December. Valeant Pharmaceuticals International Inc., which in recent months has been under fire for its pricing was among the most aggressive, with 13 drugs that doubled or more since December 2014.