Esomeprazole/Naproxen Drug Interactions: What to Avoid and What to Tell Your Doctor

Because esomeprazole/naproxen contains two active ingredients—a non-selective NSAID and a proton pump inhibitor—it has an extensive interaction profile. With over 56 serious drug-drug interactions documented, this is not a medication to start without a thorough review of your current medicines with your doctor and pharmacist. Here's what you need to know.

Absolute Contraindications: Never Combine These

The following medications should never be taken with esomeprazole/naproxen:

• Rilpivirine-containing HIV drugs (Complera, Edurant, Odefsey, Juluca): Esomeprazole raises stomach pH, significantly reducing rilpivirine absorption and potentially causing treatment failure and HIV drug resistance. This combination is absolutely contraindicated.
• Nelfinavir (Viracept): Esomeprazole decreases nelfinavir levels through a pH-dependent mechanism and possibly CYP2C19 inhibition of active metabolite conversion. Combination may cause virologic failure.

Serious Interactions: Use With Extreme Caution

These interactions don't make the combination impossible, but they require close monitoring, possible dose adjustments, or switching to an alternative medication:

• Warfarin and other oral anticoagulants (Coumadin, Jantoven, apixaban, rivaroxaban, dabigatran): NSAIDs can increase bleeding risk through platelet inhibition and GI mucosal effects. Concurrent NSAID use significantly raises the risk of serious GI bleeding. INR monitoring should be increased if this combination cannot be avoided.
• Clopidogrel (Plavix): PPIs like esomeprazole inhibit CYP2C19, reducing the formation of clopidogrel's active metabolite. This can diminish clopidogrel's antiplatelet effect. If both are needed, consider a PPI with lesser CYP2C19 interaction (like pantoprazole), though evidence is mixed.
• Methotrexate: NSAIDs may reduce methotrexate renal clearance, potentially increasing methotrexate plasma levels and toxicity risk. Monitor patients on both drugs for methotrexate toxicity signs (mouth sores, bone marrow suppression).
• Lithium: NSAIDs reduce renal prostaglandin synthesis, which can decrease lithium excretion and increase serum lithium levels—sometimes to toxic levels. Monitor lithium levels frequently if concurrent use is necessary.
• ACE inhibitors and ARBs (lisinopril, losartan, etc.): NSAIDs can blunt the antihypertensive effect of these medications by reducing vasodilating renal prostaglandins. Also may increase risk of renal impairment, especially in elderly or volume-depleted patients.
• Diuretics (furosemide, thiazides): NSAIDs may reduce the natriuretic effect of diuretics, potentially worsening hypertension and fluid retention. Blood pressure should be monitored closely.
• SSRIs and SNRIs (sertraline, fluoxetine, venlafaxine, etc.): Combining NSAIDs with serotonin-affecting antidepressants increases GI bleeding risk. If both are needed, closely monitor for signs of bleeding.

Interactions With Specific HIV Medications

In addition to rilpivirine (which is absolutely contraindicated), esomeprazole interacts with other HIV medications:

• Atazanavir (Reyataz): Esomeprazole significantly reduces atazanavir absorption. Use should be avoided or PPI dose should not exceed 20 mg/day equivalent; must be given ~12 hours before atazanavir/ritonavir in treatment-naive patients only.
• Acalabrutinib (Calquence): PPIs significantly reduce acalabrutinib exposure; avoid combination if possible.

Herbal and Supplement Interactions

Not all interactions involve prescription drugs. Watch out for these:

• St. John's Wort: A potent inducer of CYP3A4 and CYP2C19; significantly reduces esomeprazole plasma levels and may reduce stomach protection. Avoid while taking esomeprazole/naproxen.
• Fish oil (omega-3s): High-dose omega-3 supplementation may have antiplatelet effects; combining with NSAIDs could increase bleeding risk.
• Alcohol: Significantly increases GI bleeding and stomach irritation risk with NSAID therapy. Avoid alcohol while taking esomeprazole/naproxen.

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What to Tell Your Doctor and Pharmacist

Before starting esomeprazole/naproxen, give your healthcare team a complete list of:

• All prescription medications, including anticoagulants, antihypertensives, psychiatric medications, and any HIV drugs
• All OTC medications (especially aspirin, ibuprofen, or other NSAIDs, antacids, and acid reducers)
• All supplements and herbal products (especially St. John's Wort, fish oil, or ginkgo)

For a complete overview of side effects, see our guide on esomeprazole/naproxen side effects. Or learn more about the drug itself in what is esomeprazole/naproxen.