Escitalopram and Omeprazole: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jul 2, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Escitalopram
Omeprazole
How we grade severity & evidence
Severity levels
- Contraindicated: These should generally not be used together.
- Major: Potentially serious — often needs a change or close monitoring.
- Moderate: Can be significant — usually manageable with monitoring.
- Minor: Usually limited clinical impact.
Evidence grades
- Established: Well documented — supported by controlled studies or strong clinical data.
- Probable: Good supporting evidence, though not definitively proven.
- Suspected: Some evidence suggests this interaction, but it is not well established.
- Possible: Limited or conflicting evidence; the interaction may occur.
- Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.
Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.
Here's what's going on. Omeprazole (Prilosec) slows down a liver enzyme called CYP2C19, which is the same enzyme your body uses to break down escitalopram (Lexapro). When that enzyme is slowed, escitalopram can build up in your blood, in one study roughly doubling the amount present.
More escitalopram in your system can mean more of its usual effects, like drowsiness, nausea, or a faster heartbeat. This is very manageable. Please don't stop either medicine on your own. Just let your doctor or pharmacist know you take both, and they can adjust your escitalopram dose or keep a closer eye on you if needed.
Mechanism: Omeprazole inhibits CYP2C19, the primary enzyme metabolizing escitalopram (a CYP2C19 substrate). Neither drug is a prodrug in this context, so inhibition raises escitalopram exposure.
- Direction/magnitude: Increased escitalopram exposure, approximately 2-fold in a study of 407 samples from 330 patients versus matched controls.
- Onset: Unspecified.
- Evidence: Theoretical/observational; severity rated major.
- Management: Consider escitalopram dose reduction. Monitor for serotonergic and dose-related adverse effects (nausea, sedation) and QT prolongation, particularly at higher exposures.
What happens
Increased escitalopram exposure
Interaction Deep Dive
Taking escitalopram (which is metabolized as a CYP2C19 substrate)1 together with an inhibitor of CYP2C19 can raise escitalopram exposure. One study examined 407 blood samples drawn from 330 patients against matched controls and found that giving escitalopram alongside the CYP2C19 inhibitors omeprazole or esomeprazole roughly doubled escitalopram exposure. When escitalopram is combined with a CYP2C19 inhibitor, a reduction in the escitalopram dose should be considered 2.
Why it happens (mechanism)
Inhibition of CYP2C19-mediated escitalopram metabolism
How to manage this interaction
The good news: your care team can manage this easily by tailoring your dose and monitoring you.
- Keep taking both medicines exactly as prescribed unless your doctor tells you otherwise.
- Tell your pharmacist and prescriber that you take escitalopram and omeprazole together.
- Your escitalopram dose may be lowered and individualized by your care team, since exposure can roughly double.
- Your team may monitor you more closely for side effects like nausea, drowsiness, or heart-rhythm changes.
- Report any new or worsening symptoms promptly.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
1 report — tap to read
a) Giving escitalopram together with the CYP2C19 inhibitors omeprazole or esomeprazole raised escitalopram exposure by roughly 2-fold in a study analyzing 407 blood samples from 330 patients, compared with matched controls from patients who did not receive omeprazole or esomeprazole. The concentration/dosage ratio of escitalopram was significantly greater with coadministration (a 93.9% increase with omeprazole and an 81.8% increase with esomeprazole). When these drugs are used together, consider reducing the escitalopram dosage 2.
Common questions
Can I take Escitalopram and Omeprazole together?
Omeprazole can roughly double escitalopram levels by slowing its breakdown, so keep taking both as prescribed and ask your doctor or pharmacist whether your escitalopram dose should be adjusted. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Escitalopram and Omeprazole interaction?
It is rated major. Potentially serious — often needs a change or close monitoring.
How quickly could this interaction happen?
The documented onset is "unspecified". The timing of this interaction is not well characterized.
How is the Escitalopram and Omeprazole interaction managed?
The good news: your care team can manage this easily by tailoring your dose and monitoring you. Keep taking both medicines exactly as prescribed unless your doctor tells you otherwise. Tell your pharmacist and prescriber that you take escitalopram and omeprazole together. Your escitalopram dose may be lowered and individualized by your care team, since exposure can roughly double. Your team may mo… Management is individual — always follow your own care team's guidance.
How strong is the evidence for this interaction?
The evidence is graded "theoretical". Predicted from the drugs' pharmacology; not yet confirmed in people.
From our Q&A
Real reader questions about these medications, each personally answered by our pharmacist:
- Can You Take Black Walnut Supplements With Escitalopram?
- Converting Doses Of Lexapro (Escitalopram) To Zoloft (Sertraline)
- Can You Take Lexapro (Escitalopram) With Nyquil?
- Is Sea Moss Safe To Take With Omeprazole?
- Interaction Question: Omeprazole, Spironolactone And Phentermine
- How To Dose Omeprazole And Sucralfate Together
Questions for your pharmacist
- Does my dose of Escitalopram or Omeprazole need adjusting while I take them together?
- What symptoms should prompt me to call you or my prescriber right away?
- Does the timing of my doses matter for this combination?
- Is there a safer alternative to one of these medications for me?
References (2)
- Product Information: Lexapro(R) oral tablets, oral solution, escitalopram oxalate oral tablets, oral solution. Forest Pharmaceuticals, Inc. (per FDA), St. Louis, MO, 2014. DailyMed
- Gjestad C, Westin AA, Skogvoll E, et al: Effect of proton pump inhibitors on the serum concentrations of the selective serotonin reuptake inhibitors citalopram, escitalopram, and sertraline. Ther Drug Monit 2015; 37(1):90-97. PubMed
Keep reading about Escitalopram
Keep reading about Omeprazole
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