Ambien (zolpidem) is a prescription medication primarily used to treat insomnia. It belongs to the sedative-hypnotic drug class and works by enhancing the activity of gamma-aminobutyric acid (GABA), a neurotransmitter that slows down brain activity, helping users fall asleep faster and stay asleep longer. Ambien is available in both immediate-release and extended-release (Ambien CR) formulations. The immediate-release version helps with sleep onset, while the extended-release version aids in both falling and staying asleep. It is typically prescribed for short-term use due to the risk of dependence and tolerance.