BUY AMBIEN! LOW PRICE, HIGH QUALITY! Ambien is a sedative, also called a hypnotic. It affects chemicals in your brain that may become unbalanced and cause sleep problems (insomnia). Ambien is used for the short-term treatment of insomnia (difficulty falling or staying asleep). This medication causes relaxation to help you fall asleep. Ambien may also be used for purposes other than those listed in this medication guide.