Know how to buy Ambien online safely for short-term insomnia. Begin the dose with Ambien 5mg or 10mg under doctor's surveillance! Ambien is a medication used to help people sleep, particularly when there are problems with sleep like insomnia. It is classified as a benzodiazepine and should be taken only according to the instructions on the prescription label. However, if you're struggling with insomnia and need to buy Ambien online without prescription, there are some precautions you should take before doing so. What is Ambien? Ambien is a prescription medication used to treat insomnia. It is available over the counter in some countries, but is not approved for use in the United States.order Ambien online is also classified as a benzodiazepine, which means it can be addictive and can have side effects.