A client taking clopidogrel after coronary stent placement receives a new prescription for omeprazole. Which action should the nurse take?
1Clarify the prescription because omeprazole can reduce clopidogrel's antiplatelet effect.✓ Correct answer
2Administer both drugs together because omeprazole strengthens clopidogrel activation after a stent.
3Stop clopidogrel and continue omeprazole without contacting the cardiology prescriber.
4Separate the drugs by 12 hours because dose timing completely eliminates the interaction.
Explanation
Clopidogrel requires CYP2C19-mediated conversion to its active metabolite. Omeprazole inhibits CYP2C19 and reduces clopidogrel's antiplatelet activity, even when the doses are separated in time. The nurse should clarify the prescription and ask whether an acid suppressant with less effect on clopidogrel activation, such as pantoprazole, is appropriate. Clopidogrel should not be stopped independently after stent placement.
Clinical reasoning Reduced formation of clopidogrel's active metabolite can weaken platelet inhibition and increase thrombotic risk in a client who depends on antiplatelet therapy after a coronary stent.
Decision rule Clarify concurrent omeprazole or esomeprazole use with clopidogrel; dose separation does not prevent the interaction.
CYP2C19 inhibition — Reduced activity of an enzyme needed to convert clopidogrel into its active antiplatelet metabolite.
Clopidogrel — A prodrug antiplatelet agent whose effect depends partly on CYP2C19-mediated activation.