Can You Take Omeprazole with Clopidogrel?
Last reviewed: · Source: US FDA drug label database
Omeprazole can make clopidogrel less effective at preventing clots — the FDA advises avoiding this combination; lansoprazole or pantoprazole are safer choices.
Is it safe to take Omeprazole with Clopidogrel?
Clopidogrel is a prodrug activated by the liver enzyme CYP2C19. Omeprazole inhibits this enzyme, which can reduce clopidogrel's antiplatelet effect and potentially increase the risk of heart attack or stent thrombosis. The FDA has issued a specific warning about this pair. If you need stomach protection while on clopidogrel, pantoprazole interacts far less and is usually preferred.
How do Omeprazole and Clopidogrel interact?
Omeprazole is a moderate-to-strong CYP2C19 inhibitor. Clopidogrel requires CYP2C19-mediated two-step activation to its active thiol metabolite. Co-administration reduces active metabolite exposure and platelet inhibition measured by platelet function testing. Pantoprazole has minimal CYP2C19 inhibition and is the preferred PPI alternative.
Data sourced from the US Food and Drug Administration (FDA) drug label database: FDA Drug Safety Communication: clopidogrel and omeprazole interaction.
Who should be careful?
Anyone taking clopidogrel after a heart attack, stent, stroke, or TIA. Do not add over-the-counter omeprazole to prescription clopidogrel without speaking to a pharmacist first.
What if I've already taken Omeprazole and Clopidogrel?
Do not stop either drug suddenly. Occasional overlap is not an emergency, but book a review with your GP or pharmacist to switch the PPI — usually to pantoprazole or lansoprazole.
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Frequently Asked Questions
Can I take omeprazole with clopidogrel?
It is best avoided. Omeprazole can reduce clopidogrel's clot-preventing effect. Pantoprazole is the usual alternative if you need a PPI.
Which heartburn tablet is safe with clopidogrel?
Pantoprazole has the least interaction. Simple antacids and alginates (Gaviscon) are also fine. Ask your pharmacist before using omeprazole or esomeprazole.
Why does omeprazole affect clopidogrel?
Clopidogrel must be activated by the liver enzyme CYP2C19. Omeprazole blocks this enzyme, so less active drug is produced.
I've been on both for months — am I in danger?
Don't panic and don't stop either drug. Arrange a medication review; your prescriber can switch the PPI or reassess your antiplatelet therapy.