Ambien belongs to the non-barbiturate hypnosis class, used as the first-line treatment for insomnia and other sleep disorders. This is a planned IV drug, so you can buy it at your local pharmacy or buy Ambien online only if you receive the appropriate prescription from your doctor. One can order Ambien online in tablet form. Using Ambien as prescribed by your doctor can help you treat sleeping disorders (insomnia). There are many sleeping aids available that are synthesized on the base compound of certain medications.