NEW YORK ( TheStreet) -- Idenix Pharmaceuticals (Nasdaq: IDIX) is trading at unusually high volume Friday with 7.2 million shares changing hands. It is currently at 4.1 times its average daily volume and trading down $1.67 (-12.7%) at $11.52 as of 1:05 p.m. ET. Idenix has a market cap of $1.43 billion and is part of the health care sector and drugs industry. Shares are up 77.2% year to date as of the close of trading on Thursday. Idenix Pharmaceuticals, Inc., a biopharmaceutical company, engages in the discovery and development of drugs for the treatment of human viral diseases in the United States and Europe. Its primary research and development focus is on the treatment of patients with hepatitis C virus (HCV). TheStreet Ratings rates Idenix as a sell. The area that we feel has been the company's primary weakness has been its declining revenues. You can view the full Idenix Ratings Report. See all heavy volume stocks in our stocks moving on unusual volume list or get investment ideas from our investment research center. Interested in other stocks that are falling on unusually high volume? Get free SMS text alerts sent to you when the action happens by texting HVDOWN to 95370 or select from multiple alert options.