The Client Is Receiving Phenobarbital (Nembutal) for Seizure Control

The client is receiving phenobarbital (Nembutal) for seizure control. The client asks the nurse how this little pill can stop his seizures. What is the best response by the nurse?

A) "Phenobarbital (Nembutal) stops your seizures by decreasing the calcium in your brain which is responsible for the seizures."
B) "Phenobarbital (Nembutal) stops your seizures by decreasing the sodium in your brain which is responsible for the seizures."
C) "Phenobarbital (Nembutal) stops your seizures by increasing a chemical called glutamate that calms down the excitability in your brain."
D) "Phenobarbital (Nembutal) stops your seizures by increasing a chemical called GABA that calms down the excitability in your brain."