Onazepam is a medication that belongs to the class of benzodiazepines, which are commonly used to treat anxiety and insomnia. It acts as a central nervous system depressant, enhancing the effects of the neurotransmitter GABA, leading to a calming effect. Onazepam is not widely used and may not be available in all countries. As with other benzodiazepines, it carries a risk of dependence and should be used under medical supervision.