What drug schedule is phenobarbital classified under?

Phenobarbital is classified under Schedule IV of the Controlled Substances Act. This classification indicates that phenobarbital, while it has accepted medical uses, also has a potential for abuse and dependence, though that potential is relatively low compared to substances in higher schedules. Schedule IV drugs are considered to have a lower risk of addiction and misuse, which is why phenobarbital, often used as an anticonvulsant and sedative, is appropriately classified in this category. This classification allows veterinarians to prescribe phenobarbital while still maintaining regulatory control to prevent misuse.