Ambien is the name by which the drug Zolpidem is sold and people buy Ambien online because it treats sleep disorders like insomnia and belongs to a class of medicines called central nervous system (CNS) depressants, which slow down the nervous system. The drug was first approved for intake by the U.S. FDA (Food and Drug Administration) in 1992 and the original manufacturer of this drug is Sanofi-Aventis.