Ambien is a prescription medication commonly used to treat insomnia. However, some people may consider buying Ambien without a prescription in order to save time and money. While this may seem like a convenient option, it can lead to serious consequences. Ambien is a powerful sedative that can have serious side effects if not taken properly. Without a prescription, people may not know the correct dosage or how to safely use the medication, increasing the risk of overdose or other harmful effects.