Buy Ambien online- Either you buy Ambien online or offline; there are certain dosage instructions that are needed for the efficient and effective working of this drug. It is a hypnotic/sedative that is a controlled substance and sold only upon the issuance of a prescription. For those people who have ben starting the treatment from this drug, require recommended 10mg of tablet a day each day before bedtime. There are many times when the dosage might have to be started from just 5mg a day.