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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.
In the 1990s, Ambien, or zolpidem tartrate, was designed to offer the benefits of other hypnotic drugs without some of the more severe side effects. Ambien has since become one of the most popular sleep medications, ranking at number 15 on the list of the most frequently prescribed drugs in the country, according to IMS Health.