Ambien is a small, white, oval tablet that is taken by mouth. It is a sedative-hypnotic medication that works by slowing down activity in the brain. Ambien is used to treat insomnia, a sleep disorder that is characterized by difficulty falling or staying asleep. Ambien is typically taken once a day, within 30 minutes of bedtime. It is important to avoid taking Ambien if you have not had a chance to get a full night's sleep, as this can increase the risk of side effects such as dizziness and drowsiness. Buy Ambien online without a prescription.