Ambien is the brand name for zolpidem, a prescription medication primarily used to treat insomnia. It belongs to a class of drugs known as sedative-hypnotics, which work by slowing down brain activity to help induce sleep. Ambien is typically prescribed for short-term treatment of insomnia, particularly for people who have trouble falling asleep. It's not generally recommended for long-term use due to the potential for dependence. Ambien works by enhancing the activity of a neurotransmitter called gamma-aminobutyric acid (GABA) in the brain. GABA has a calming effect, which helps initiate sleep.