The Client Is Receiving Phenobarbital (Luminal)for Seizure Control

The client is receiving phenobarbital (Luminal) for seizure control.The client asks the nurse how this little pill can stop his seizures.The nurse is aware that phenobarbital (Luminal) stops seizures by:

A) Increasing a chemical called glutamate that calms down the excitability in the brain.
B) Decreasing the sodium in the brain, which is responsible for the seizures.
C) Decreasing the calcium in the brain, which is responsible for the seizures.
D) Increasing a chemical called GABA that calms down the excitability in the brain.