Methamphetamine 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
Methamphetamine
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.
Let's talk about taking Desoxyn (methamphetamine) along with Prilosec (omeprazole). Your body clears methamphetamine out through your urine, and how fast that happens depends on how acidic your urine is. Medicines like omeprazole can make your urine a little less acidic, which may cause the methamphetamine to hang around longer and build up in your system.
If that happens, you could feel stronger stimulant effects, like a faster heartbeat, jitteriness, trouble sleeping, or higher blood pressure. The good news is this is a theoretical concern, meaning it's based on how the drugs work rather than lots of real-world reports. Please don't change anything on your own. Just let your pharmacist or doctor know you take both so they can guide you.
Effect: Increased amphetamine exposure and potentiated stimulant action.
Mechanism: Amphetamine renal elimination is pH-dependent. Urinary alkalinization increases the fraction of un-ionized drug reabsorbed in the tubule, decreasing renal clearance and prolonging half-life. Omeprazole is listed as a GI/urinary alkalinizing agent here; neither drug is a prodrug relevant to this pathway.
- Direction: Increased methamphetamine levels/half-life.
- Onset: Unspecified.
- Evidence: Theoretical.
- Severity: Major.
Management: Documentation advises avoiding concomitant use. If co-prescribed, monitor for sympathomimetic toxicity (tachycardia, hypertension, agitation, insomnia); dose may need individualization by the care team.
What happens
Increased exposure to amphetamine
Interaction Deep Dive
Amphetamines should not be taken together with alkalizing agents affecting the gastrointestinal tract1 or urinary system, since doing so may elevate amphetamine blood concentrations and enhance its effects 2. Because amphetamine elimination depends on pH, alkaline urine substantially prolongs its half-life 1.
Why it happens (mechanism)
Decreased renal elimination
How to manage this interaction
Both of these can be managed by your care team. Here is what typically happens and what you can do:
- Keep taking both as prescribed unless your doctor or pharmacist tells you otherwise. Do not stop or change doses on your own.
- Your care team may watch you more closely for stronger stimulant effects, and your methamphetamine dose may be adjusted and individualized if needed.
- In some cases the team may consider whether an alternative is a better fit.
Tell your pharmacist or prescriber that you take both, and report a fast or pounding heartbeat, feeling wired, trouble sleeping, or rising blood pressure.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Methamphetamine and Omeprazole together?
Omeprazole may reduce how fast your body clears methamphetamine, so the stimulant effect could be stronger; keep taking both as prescribed and let your pharmacist or doctor know you use both so they can monitor and adjust if needed. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Methamphetamine 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 Methamphetamine and Omeprazole interaction managed?
Both of these can be managed by your care team. Here is what typically happens and what you can do: Keep taking both as prescribed unless your doctor or pharmacist tells you otherwise. Do not stop or change doses on your own. Your care team may watch you more closely for stronger stimulant effects, and your methamphetamine dose may be adjusted and individualized if needed. In some cases the team m… 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 Methamphetamine 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: Desoxyn(R) oral tablets, methamphetamine HCl oral tablets. Recordati Rare Diseases Inc (per FDA), Lebanon, NJ, 2017.
- Product Information: EVEKEO ODT(TM) orally disintegrating tablets, amphetamine sulfate orally disintegrating tablets. Arbor Pharmaceuticals LLC (per FDA), Atlanta, GA, 2019.
Keep reading about Methamphetamine
Keep reading about Omeprazole
These medications also interact with supplements
Prescription drugs aren't the whole picture — herbal and dietary supplements can interact with them too. From the evidence-graded Natural Medicines database:
major · moderate · minor — check everything you take with our drug–supplement interaction checker.
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