Zolpidem
"Ambien is definitely effective for sleep, I think most will agree with that.  It did put me to sleep.  I am a very social person, and enjoy talking to people and being around people.  I started taking the generic ambien in Nov of 2008 and was on it for a year.  It worked great for 2 Months, then the side effects began.  I started to get heart palpatations which is unusual for me a 30 year old male, not overweight and overall healthy with sleep issues.  Then, I began getting dizzy, which turned into dizziness with horrible anxiety.  I have never had a panic attack until I took ambien.  I would get bad anxiety at the grocery store, at lunch with customers, and at work.  Been off this for 2 months and the anxiety is finally gone, no sleep."