However, navigating the online landscape for purchasing prescription drugs legally can be a daunting task. This article aims to provide you with a comprehensive guide on how to legally buy Ambien online in the USA while ensuring your safety and well-being. Understanding Ambien. Before diving into the process of buying Ambien online, it's crucial to understand what this medication is and why it's prescribed. Ambien is a brand name for the generic drug Zolpidem, which is commonly prescribed to treat insomnia. It belongs to a class of medications known as sedative-hypnotics and works by affecting certain chemicals in the brain to induce sleep.