Why Was I Prescribed Ambien? What Are the Side Effects? by Taylor Bennett | Nov 1, 2017 | Mental Health Topics, Psychiatry Ambien (zolpidem) is a sedative or hypnotic, which works by targeting chemical imbalances in the brain. It is most often used to treat insomnia and helps individuals fall asleep shortly after taking the tablet. There is also an extended-release form called Ambien CR, which has a first layer that dissolves…