Which barbiturate is classified as long-acting?

Phenobarbital is classified as a long-acting barbiturate due to its pharmacokinetic properties, which allows it to have a longer duration of action compared to other barbiturates. Its half-life can extend from several hours to about a day, making it suitable for use in treating conditions where prolonged sedation or sleep is beneficial, such as in the management of seizures or for severe anxiety disorders. The long-acting nature of Phenobarbital allows for less frequent dosing, which is an advantage in clinical settings where long-term management of symptoms is necessary.