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Summary. 1  Ambien and Lunesta are both prescription drugs intended for the treatment of insomnia. 2  Both can be availed of in tablet form. 3  Ambien and Lunesta have an immediate sedative effect that last 7-8 hours per dosage.  Ambienâs efficacy last up to 35 days, while Lunesta remains effective up to 6 months.
Making the world better, one answer at a time. There is no difference-Ambien is simply a brand name for the compound Zolpidem Tartrate. It is the same active ingredient.mbien is a 10mg tab, ambien cr is a 12.5mg tablet for those who  tend to wake, during the night, and ofcourse is longer lasting.