The patent expiration of Ambien is however not known. But, the FDA approved first generic versions of Ambien is released in April, 2007. It was developed by the Sanofi-Aventis, a French pharmaceuticals and the Generic Ambien is called as Zolpidem. The tablet formulations are from 5mg to 10mg and are being made by many generic companies in the United States.
There are about 13 manufacturers have received FDA approval for Generic Ambien productions including Mylan Pharmaceuticals, TEVA Pharmaceuticals of USA, Ranbaxy Laboratories and many more.
Over the course of two decades, millions of Americans have taken Ambien and a decade for Generic Ambien because of its effects in sleeping inducing in a person. These sleeping pills are popularly increasing in the modern American life style. A healthcare information center in US has estimated that around 60 million prescriptions were dispensed in 2011 and it is about 20% since 2006. Approximately about 40 million products of Generic Ambien have been sold across the country.
Generic Ambien is made by Sanofi-Aventis and the company’s patent for Zolpidem Tartrate has been expired according to the FDA and so the extended-release form is not available in the generic versions.