Intermezzo contains a low dose of zolpidem, the same active ingredient in Ambien .When the drug is abruptly discontinued. Zolpidem can cause abnormal behavior with confusion, paradoxical insomnia or “complex sleep-related behaviors,” which may include sleep-driving (driving with no memory of having done so). If these side effects occur, zolpidem should be discontinued. Zolpidem is a controlled substance because it is likely to be abused and may cause dependence. Zolpidem belongs to a class of drugs called sedatives or hypnotics. Zolpidem shares some characteristics of a family of sedatives called benzodiazepineswhich includes diazepam (Valium). Benzodiazepines cause sedation, muscle relaxation, act as anticonvulsants (antiseizure medications), and reduce anxiety. Zolpidem has selectivity in that it has little of the muscle relaxant and antiseizure effects and more of the sedative effect. Therefore, it is used primarily as a medication for sleep. The FDA approved Intermezzo in November 2011. The first formulation of zolpidem (Ambien) was approved in 1992.