Benzodiazepines are a class of drugs that act upon benzodiazepine receptors (BZ-R) in the central nervous system. They are depressants that slow down the activity of the central nervous system and the messages traveling between the brain and the body. Benzodiazepines are used to treat a variety of symptoms and conditions, including anxiety, insomnia, muscle spasms, seizures, and agitation. The most common benzodiazepines are prescription drugs such as Valium®, Xanax®, Halcion®, Ativan®, and Klonopin®. Shorter-acting benzodiazepines used to manage insomnia include estazolam (ProSom®), flurazepam (Dalmane®), temazepam (Restoril®), and triazolam (Halcion®). Benzodiazepines can be habit-forming and can cause dependence and withdrawal symptoms, even after only using them for a short period. They are also associated with amnesia, hostility, irritability, and vivid or disturbing dreams. Benzodiazepines slow down the central nervous system and may cause sleepiness and relaxed mood. Overdose effects of benzodiazepines include extreme drowsiness, confusion, impaired coordination, decreased reflexes, respiratory depression, coma, and possible death. Benzodiazepines are usually a pill or tablet in varying colors and shapes. They are also known by their chemical (generic) name or their brand name.