This drug was withdrawn from the market in 2004. The manufacturer, MERCK & Co, said that there was an increasing risk to get heart problem when using VIOXX. They talked about increasing risk. When we talk about Propoxyphene DARVON/DARVOCVET AND CO-PROXAMOL - we talk about fatal deaths, thousands of fatal deaths just in United States.Just today August 4th MERCK & CO will start to pay $4.85 billion - in damages to some 70 000 VIOXX-users.See further: Darvon, Distalgesic and Co-Proxamol the worst drugs everhttp://www.youtube.com/watch?v=vw5O4tgErsgAnd Darvon, Darvocet, Distalgesic and Co-Proxamol (Dextro) Propoxyphenehttp://en.wikipedia.org/wiki/Eli_Lilly_Controversy#Darvon.2C_Darvocet.2C_Distalgesic_and_Co-Proxamol_.28Dextro.29_Propoxyphene