Ambien is the brand name that is used to sell Zolpidem. Zolpidem is a sedative-hypnotic type of drug. It is used to treat a sleeping disorder called insomnia in adults. With Insomnia, the patients face complications while falling asleep or can’t sleep for a long time that is necessary for them. They lack proper sleep and sufficient rest. Ambien is a sedative, that’s why it is a prescription medicine.