Oregano oil may interfere with your meds, new study warns
NCT ID NCT06693960
First seen Jun 07, 2026
Summary
This early-phase trial at Washington State University is testing whether oregano supplements affect how the body breaks down common drugs. Sixteen healthy adults will take oregano oil alongside a cocktail of five drugs (caffeine, dextromethorphan, losartan, midazolam, and omeprazole). Researchers will measure drug levels in the blood to see if oregano changes their metabolism. The goal is to understand potential herb-drug interactions, not to treat any disease.
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This is a summary of
the original study
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Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
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Contacts and locations
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Study contacts
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Contact
Phone: •••-•••-•••• Email: •••••@•••••
Locations
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Washington State University College of Pharmacy and Pharmaceutical Sciences
RECRUITINGSpokane, Washington, 99202, United States
Contact
Contact Phone: •••-•••-•••• Email: •••••@•••••
Contact
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What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
Active substance
oregano oil (dietary supplement)
What this could lead to
If it works, this could help people know whether taking oregano supplements changes how their medications work.
What could go wrong
This is a very small, early-phase study in healthy people, not patients. Results may not apply to everyone, and oregano might not affect drug metabolism at all.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.