Barbital, also known as barbitone, is a type of sedative that was commonly used in the past to treat anxiety and insomnia. However, due to its addictive nature and potential side effects, its use has declined in recent years. There are several synonyms for barbital, including phenobarbital, amobarbital, butabarbital, pentobarbital, and secobarbital. These substances have similar properties and effects, and are also used as sedatives or anticonvulsants. While they can be effective in treating certain conditions, they should only be used under the guidance of a healthcare professional and with caution due to their potential for addiction and overdose.