The client has been started on phenytoin and reports to the nurse that he also takes ginkgo. What is the most accurate response from the nurse?
a. "Ginkgo can decrease the effectiveness of phenytoin."
b. "Ginkgo can increase the effectiveness of phenytoin."
c. "Ginkgo can cause an anaphylactic reaction to phenytoin."
d. "Ginkgo can cause phenytoin to reach a toxic level."
ANS: A
Ginkgo can cause phenytoin to be less effective than normal.
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