A Client Diagnosed with Narcolepsy Is Prescribed Ephedrine, and Asks

A client diagnosed with narcolepsy is prescribed ephedrine, and asks the nurse how this medication will improve the problem.The nurse's response will be based on which one of the following physiologic concepts?

A) Ephedrine can be easily destroyed by the enzymes in the synaptic cleft.
B) Ephedrine can easily cross the blood-brain barrier.
C) Ephedrine cannot be easily absorbed through the intestinal tract.
D) Ephedrine will prevent any attacks of epilepsy.