Since we’re talking about the reasons of why you should buy Ambien 5mg online or order 5mg online, we would first like to discuss about what is Ambien and why is it prescribed? Ambien is the brand name of the drug Zolpidem and is classified as a Schedule IV controlled substance under the Controlled Substances Act of 1970 (CSA). Basically, the drug is prescribed to treat a person’s insomnia or other sleeping disorders of a similar kind.