A client with epilepsy who has been seizure free and prescribed phenytoin (Dilantin) asks the nurse why he or she needs to still have blood testing. Which response should the nurse provide the client?
A. "Phenytoin (Dilantin) has a very narrow range between a therapeutic dose and a toxic dose."
B. "Phenytoin (Dilantin) can cause blood-thinning in some patients."
C. "Phenytoin (Dilantin) can cause Stevens-Johnson syndrome, which can be detected through blood testing."
D. "Phenytoin (Dilantin) can deplete your system of potassium."
Answer: A
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