Zohydro ER is the name of the new extended release hydrocodone. It only contains hydrodocone. It went on the market in the U.S. in March 2014. It is very expensive because it is so new. It has also been controversial due to the rate of addiction and abuse with hydrocodone.
FDA approves extended-release, single-entity hydrocodone product-
www.fda.gov/NewsEvents/Newsroom/PressAnnouncements/ucm372287.htmZohydro™ ER (hydrocodone bitartrate) Extended-Release Capsules-
www.zogenix.com/content/products/zohydro.htm