Hello,
Ambien on average is recommended only for 7 to 10 days. IT IS NOT a cure for the underlying problem of insomnia.
As mentioned, taking it for a extended period of time can lead to addiction as well as serious bouts of what is called "rebound insomnia". This type of insomnia can happen after only a few days of usage and then stopping the drug. I would imagine it is a real problem for people that have relied on it for "longer than suggested" time but again, each person is different and what may be a "side effect" for one may not be for another.
It would be best to determine the root cause of your sleep issues than to rely on any drug but, I do understand that there is a need for Ambien and as mentioned, I have taken it in the past and it has worked wonders.
More info can be found at:
www.ambien.com
Best regards.
J