Omeprazole and Alprazolam: 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
Alprazolam
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. Your body uses a liver enzyme to break down and clear alprazolam (Xanax). Omeprazole (Prilosec) can slow that enzyme down a bit. When that happens, alprazolam can hang around longer and build up, so you might feel more of its effects, like extra drowsiness, dizziness, unsteadiness, or feeling foggy.
The good news: this is expected in theory rather than something firmly proven for this exact pair, and it's very manageable. Keep taking both medicines as prescribed, and let your pharmacist or doctor know if you feel unusually sleepy or off balance. They can adjust your dose or suggest another option if needed.
Mechanism: Omeprazole inhibits CYP2C19 (and to a lesser extent CYP3A4), reducing oxidative metabolism and clearance of alprazolam, increasing exposure and prolonging CNS effects. Neither drug is a prodrug here; the affected drug (alprazolam) simply accumulates.
- Direction: increased alprazolam effect/toxicity (sedation, ataxia, lethargy).
- Onset: delayed.
- Evidence: theoretical, extrapolated from diazepam data (reduced clearance mainly in extensive omeprazole metabolizers).
- Magnitude: variable, likely modest.
Management: Monitor for CNS depression and adjust alprazolam dose as needed. Consider a glucuronidated benzodiazepine (lorazepam, oxazepam, temazepam), which bypasses CYP metabolism.
What happens
Benzodiazepine toxicity (CNS depression, ataxia, lethargy)
Interaction Deep Dive
When diazepam and omeprazole are taken together, diazepam metabolism has been reported to slow and its elimination to be delayed, which produces stronger and longer-lasting benzodiazepine effects423. According to one study, reduced diazepam clearance was seen in nearly half of patients who metabolized omeprazole rapidly, whereas the combination had minimal impact in those who were slow omeprazole metabolizers1. This kind of effect has not yet been documented for concurrent alprazolam and omeprazole use, but comparable outcomes would be anticipated. Because lorazepam, oxazepam, and temazepam undergo metabolism through glucuronidation instead of the cytochrome P450 enzyme system, they may serve as suitable alternatives for patients who require both omeprazole and benzodiazepine treatment.
Why it happens (mechanism)
Slowed benzodiazepine metabolism and clearance
How to manage this interaction
This is manageable with a few simple steps. Keep taking both medications exactly as prescribed unless your care team tells you otherwise.
- Your team may monitor you more closely for signs of over-sedation: drowsiness, lethargy, slurred speech, or unsteadiness.
- Your alprazolam dose may be adjusted and individualized by your prescriber if needed.
- They may consider a benzodiazepine cleared a different way (lorazepam, oxazepam, or temazepam), which is less affected by omeprazole.
What to do: Tell your pharmacist or doctor if you feel unusually sleepy or off balance. Do not stop or change either medicine on your own.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Omeprazole and Alprazolam together?
Omeprazole may slow the breakdown of alprazolam, so it can build up and cause more drowsiness or unsteadiness; watch for extra sedation and check with your pharmacist or doctor, who can adjust the dose or suggest an alternative. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Omeprazole and Alprazolam interaction?
It is rated moderate. Can be significant — usually manageable with monitoring.
How quickly could this interaction happen?
The documented onset is "delayed". Effects tend to build up gradually over days to weeks.
How is the Omeprazole and Alprazolam interaction managed?
This is manageable with a few simple steps. Keep taking both medications exactly as prescribed unless your care team tells you otherwise. Your team may monitor you more closely for signs of over-sedation: drowsiness, lethargy, slurred speech, or unsteadiness. Your alprazolam dose may be adjusted and individualized by your prescriber if needed. They may consider a benzodiazepine cleared a different… 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:
Questions for your pharmacist
- Does my dose of Omeprazole or Alprazolam 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 anything you'd monitor while I'm on both?
References (4)
- Andersson T, Cederberg C, Edvardsson G, et al: Effect of omeprazole treatment on diazepam plasma levels in slow versus normal rapid metabolizers of omeprazole. Clin Pharmacol Ther 1990; 47:79-85. PubMed
- Gugler R & Jensen JC: Omeprazole inhibits elimination of diazepam (letter). Lancet 1984; 1:969. DOI
- von Herrath D & Thimme W: Wechselwirkungen von omeprazole und cimetidine mit diazepam. Der Arzneimittelbrief 1993; 27:87.
- Product Information: Prilosec(R), omeprazole. Astra Merck Inc. Wayne, PA, 1997. DailyMed
Keep reading about Alprazolam
Keep reading about Omeprazole
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Prescription drugs aren't the whole picture — herbal and dietary supplements can interact with them too. From the evidence-graded Natural Medicines database:
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