Benzodiazepines are a class of psychoactive drugs used to treat a variety of conditions, such as anxiety, insomnia, seizures, muscle spasms, and alcohol withdrawal. They work by enhancing the effect of the neurotransmitter gamma-aminobutyric acid (GABA) in the brain, producing a calming effect. Common examples include diazepam, lorazepam, and alprazolam.