The most common benzodiazepines are the prescription drugs Valium ® , Xanax ® , Halcion ® , Ativan ® ,and Klonopin ® .Tolerance can develop, although at variable rates and to different degrees. Shorter-acting benzodiazepines used to manage insomnia include estazolam (ProSom ® ), flurazepam(Dalmane ® ),temazepam (Restoril ® ), and triazolam (Halcion ® ). Midazolam (Versed ® ), a short-acting benzodiazepine, is utilized for sedation, anxiety, and amnesia in critical care settings and prior to anesthesia. It is available in the United States as an injectable preparation and as a syrup (primarily for pediatric patients). Benzodiazepines with a longer duration of action are utilized to treat insomnia in patients with daytime anxiety. These benzodiazepines include alprazolam (Xanax ® ), chlordiazepoxide(Librium ® ), clorazepate (Tranxene ® ), diazepam (Valium ® ), halazepam (Paxipam ® ), lorzepam (Ativan ® ), oxazepam (Serax ® ), prazepam (Centrax ® ), and quazepam (Doral ® ).Clonazepam (Klonopin ® ),diazepam, and clorazepate are also used as anticonvulsants.