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Drug Interactions
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Drug Interactions
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Ch.9 Drugs / Drug Interactions / Problem 3
Problem 3
Which statement best analyzes why grapefruit juice increases plasma levels of some medications?
A
Grapefruit juice universally induces all hepatic enzymes causing drugs to be metabolized faster and thus decreases systemic concentrations for all oral medications.
B
Grapefruit juice directly binds circulating drugs in plasma, forming insoluble complexes that are rapidly excreted, thereby preventing toxicity.
C
Compounds in grapefruit inhibit intestinal CYP3A4 and certain transporters, reducing first-pass metabolism and increasing systemic drug availability.
D
Grapefruit acts as an antagonist at drug receptors in peripheral tissues, blocking drug action without changing systemic concentrations.
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