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Dietary supplement

Oregano Oil 150 mg Ingredients & Drug Interactions

by Thompson

Oregano Oil 150 mg label
See full label image
Softgel Capsule Category: Botanical
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 16, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Oregano Oil 150 mg against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.

Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy

The interaction bottom line Most serious interaction: Moderate

Oregano Oil 150 mg is a dietary supplement by Thompson with 1 active ingredient. Its ingredients are commonly taken for digestive upset, respiratory and cold symptoms, antimicrobial support.Based on those ingredients, 208 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Oregano oil extract. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against Oregano Oil 150 mg by Thompson

Ask about any prescription or over-the-counter medication and we check it for interactions with Oregano Oil 150 mg by Thompson — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Oregano Oil 150 mg by Thompson

Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.

From our pharmacy team — supplement deep dive

Generated from HelloPharmacist’s pharmacist-curated databases and editorial rules · Last generated Aug 27, 2026

What’s inside

Full disclosure
Ingredient Transparency · database check
Full

Every active ingredient lists its own amount on the label.

Why this rating?
  • The label discloses an exact amount for 1 of its 1 active ingredient.
  • No proprietary blends here — you can verify the dose of every single component.

This softgel holds one active ingredient: oregano oil extract at 150 mg per capsule. The capsule itself is made from gelatin and glycerine, which are inactive ingredients that help hold and deliver the oregano oil.

Does it work?

Couldn't assess
Evidence for Intended Use · database check
By FDA rules, dietary supplements can’t claim to treat, cure, or prevent disease — so labels speak in careful marketing language. We discern each product’s intended use from its name, label claims, and label statements, then grade the clinical evidence for that use. How these ratings are computed
Not assessable

This is a single-ingredient Oregano product and its label doesn't state a use — see Oregano's own graded uses on its monograph.

Why this rating?
  • We looked at the product name, claims, and label statements and couldn't find a stated purpose to grade.

The evidence we hold for oregano oil doesn't establish its effectiveness for acne, bronchitis, asthma, headache, or upper respiratory tract infections. The data shows insufficient reliable evidence to rate it for any of these uses.

If you're thinking about this supplement for one of those reasons, talk with your doctor about whether it's likely to help you.

The evidence, ingredient by ingredient Oregano

How safe is it?

Well-documented data
Safety Information · database check
Well characterized

Adverse-effect, pregnancy, and general safety data are on file for most of these ingredients.

Why this rating?
  • We hold adverse-effect (side-effect) data for 1 of the 1 matched ingredient.
  • Pregnancy & breastfeeding safety ratings cover 1 of 1.
  • General safety write-ups exist for 1 of 1.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Oregano used in normal food amounts is generally well tolerated. This supplement, though, is a concentrated extract—much stronger than what you'd get from seasoning your dinner—and we have limited safety information at these higher doses.

Most people tolerate it without trouble, but some report gastrointestinal upset. Rarely, oregano can trigger allergic reactions, including severe ones like anaphylaxis in sensitive people.

During pregnancy, medicinal or supplement amounts of oregano should be avoided; food amounts are likely fine. While breastfeeding, there isn't enough safety data to know whether this supplement dose is okay, so talk with your doctor or pharmacist for personalized advice.

If you have a family history of allergies to oregano, thyme, or other plants in the mint family, mention that to your healthcare provider before taking this.

Side effects, ingredient by ingredient Oregano

Meds to double-check

Moderate interaction found
Known Interaction Concern · database check
Moderate identified

The most serious documented interaction for these ingredients is Moderate. Check your medications for a personalized result.

Why this rating?
  • 1 of the 1 matched ingredient can interact with medications — Oregano.
  • The most serious interaction on file is rated Moderate.
  • Some involve high-stakes drug classes: anticoagulant / antiplatelet drugs; diabetes medications.
  • For scale: 208 individual medications appear in the full list. A big number alone doesn't make a product dangerous — what matters is whether YOUR medication is on it, so run yours through the interaction checker on this page.

Before you take this, double-check whether you're on blood thinners or antiplatelet drugs (like warfarin, aspirin, or clopidogrel)—oregano oil may raise your bleeding risk. Also confirm with your doctor or pharmacist if you take diabetes medications, since oregano might lower your blood sugar further.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFully disclosed formula with no assessable stated purpose. Moderate medication interactions have been identified, and safety information is well characterized.

This product may work best for someone who wants to try oregano oil extract and doesn't take blood thinners, antiplatelet drugs, or diabetes medications. If you're on any of those, or if you're pregnant or breastfeeding, check with your doctor or pharmacist first.

Even if you're not on medications, an allergic reaction is possible, though uncommon.

Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI

Assessment coverage: 1 of 1 active ingredient matched to our full ingredient reviews (monographs). Based on the product label dated Aug 26, 2014.

This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed

At a glance

General information

Key facts about Oregano Oil 150 mg, straight from the product label.

Brand Thompson
Barcode (UPC) 031315191206
Net contents 60 Softgel(s)
Market status On market
Date entered into DSLD Aug 26, 2014
DSLD ID 36506
Product type Botanical
Supplement form Softgel Capsule
Dietary claims / uses All Other
Intended target group(s) Adult (18 - 50 Years)
From the label
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.

Supplement Facts

The label details for Oregano Oil 150 mg by Thompson, sourced from the NIH Dietary Supplement Label Database.

Supplement Facts

Daily Value (DV) Target Group(s):
Adults and children 4 or more years of age
Minimum serving Sizes:
1 Softgel(s)
Maximum serving Sizes:
1 Softgel(s)
UPC/BARCODE
031315191206
IngredientAmount% DV
Oregano oil extract150 mg--

Other ingredients: Gelatin, Glycerine

Tap any ingredient to jump to its full detail below.

Label statements
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
General Statements

SINCE 1932

IN A BASE OF VIRGIN OLIVE OIL

ONCE DAILY

FRESH HEALTHY

Keep your licensed health care practitioner informed when using this product.

FDA Statement of Identity

DIETARY SUPPLEMENT

Precautions

WARNING: Do not use if safety seal is broken or missing.

Keep out of reach of children.

Do not use if you are pregnant or lactating.

Suggested/Recommended/Usage/Directions

Directions: Use only as directed. Take one softgel up to three times daily with a meal or glass of water.

Storage

Store in a cool, dry place.

Brand IP Statement(s)

Our own laboratory analysis guarantees purity and freshness of all Thompson(R) products.

(C)2007

Is this label outdated? Report a formula or label change and our pharmacy team will review it.

See for yourself

Oregano Oil 150 mg by Thompson label

The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.

Oregano Oil 150 mg label

Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.

View the full label (PDF)
What’s inside

The Ingredients in Oregano Oil 150 mg by Thompson

This is the 1 active ingredient this product is made of. Select it to open its full monograph.

Serving size1 Softgel(s) Dosage formSoftgel Capsule Amounts shown are per serving.

Oregano oil extract

Interacts with
208 drugs
150 mg per serving

Oregano is a common Mediterranean cooking herb that is also sold as a concentrated oil or supplement, often standardized for a compound called carvacr...

Oregano oil extract monograph & interactions

Other (inactive) ingredients: Gelatin, Glycerine. These complete the product’s ingredient list but are not active constituents.

Interaction report

Oregano Oil 150 mg by Thompson Drug Interactions

Want to check YOUR meds against Oregano Oil 150 mg?

Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.

 Go to the checker
208Drugs
208 Moderate

Ingredients driving the most interactions

Oregano oil extract 208

Individual Drug Interactions

The ingredients in Oregano Oil 150 mg interact with 208 drugs. Click any drug to see the details.

1 of the 1 ingredient in Oregano Oil 150 mg interact with drugs. Each result below shows which ingredient is responsible. Oregano oil extract

Each ingredient & the kinds of drugs it affects

For each ingredient in Oregano Oil 150 mg with known interactions, here are the types of medications it can affect. Open any type for the detail — or search your exact drug in the checker above.

Oregano oil extract2 drug types · 208 drugs

Anticoagulant/Antiplatelet Drugs

Theoretically, oregano might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
In vitro research shows that aristolochic acid isolated from oregano leaves has antithrombin activity. It has also been reported that oregano oil inhibits arachidonic acid-induced, and ADP-induced, platelet aggregation.

Likelihood Possible Evidence D
Antidiabetes Drugs

Theoretically, oregano might increase the risk for hypoglycemia when taken with antidiabetes drugs.
In vitro and animal research shows that oregano extracts might lower blood glucose levels.

Likelihood Possible Evidence D
Oregano oil extract full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Oregano Oil 150 mg, from the product label.

Thompson

See all Thompson products
Name
Nutraceutical Corp.
Web Address
www.nutraceutical.com
Pharmacist Counseling Corner

Oregano Oil 150 mg by Thompson: Common Questions

Does Oregano Oil 150 mg by Thompson interact with any medications?
Yes. Based on its ingredients, Oregano Oil 150 mg has a known interaction with 208 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Oregano Oil 150 mg contains a single active ingredient, and that one ingredient can interact with many different medications on its own. We check it against each medication and show the mechanism responsible.
Where does this information come from?
The product label data comes from the NIH Dietary Supplement Label Database (DSLD); the interaction data is built on the Natural Medicines database and reviewed by HelloPharmacist pharmacists.
Will oregano oil help my cough or bronchitis?
The evidence we hold doesn't establish that oregano oil works for bronchitis, cough, asthma, or upper respiratory infections. We don't have reliable data either way, so talk with your doctor about what might actually help.
Is this safe to take long-term?
Oregano used in food is safe long-term. This supplement is a much more concentrated form, and we don't have enough long-term safety data on it. If you're thinking about taking it regularly, ask your doctor or pharmacist whether it's right for you.
Can I take this while pregnant or nursing?
During pregnancy, supplement amounts of oregano should be avoided—food amounts are likely fine. While breastfeeding, we don't have enough safety data to know if this supplement dose is okay. Talk with your doctor or pharmacist for advice that fits your situation.
What are the side effects?
Most people tolerate it without trouble. Some report stomach upset. Rarely, oregano can trigger serious allergic reactions, including anaphylaxis, especially if you're sensitive to the mint family of plants (which includes thyme).
How much oregano oil is in each capsule?
Each softgel contains 150 mg of oregano oil extract.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Not sure if Oregano Oil 150 mg is safe with your meds?

Our pharmacists answer your medication & supplement questions — free.

Ask a pharmacist

Label information is sourced from the NIH Dietary Supplement Label Database and reflects the product version on file; always read your actual product label. This page is for education only and is not a substitute for professional medical advice. Confirm with your pharmacist or doctor before combining supplements and medications.

Oregano Oil 150 mg label
Go deeper

The Full Monographs Behind Oregano Oil 150 mg’s Ingredients

Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.

Herb & supplement monograph

Oregano

Interacts with 208 drugs

Oregano is a common Mediterranean cooking herb that is also sold as a concentrated oil or supplement, often standardized for a compound called carvacrol. While lab studies suggest it may hav...

Read the full Oregano monograph →
Sources

Sources & How We Checked

Oregano Oil 150 mg's label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

The 12 references behind this product’s interaction data

Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.

Oregano 12 references
  1. Brinker F. Herb Contraindications and Drug Interactions. 2nd ed. Sandy, OR: Eclectic Medical Publications, 1998.
  2. Benito M, Jorro G, Morales C, et al. Labiatae allergy: systemic reactions due to ingestion of oregano and thyme. Ann Allergy Asthma Immunol 1996;76:416-8. PubMed
  3. Chevallier A. Encyclopedia of Herbal Medicine. 2nd ed. New York, NY: DK Publ, Inc., 2000.
  4. Ciganda C, and Laborde A. Herbal infusions used for induced abortion. J Toxicol.Clin Toxicol. 2003;41:235-239. PubMed
  5. Futrell, J. M. and Rietschel, R. L. Spice allergy evaluated by results of patch tests. Cutis 1993;52(5):288-290.
  6. Tognolini, M., Barocelli, E., Ballabeni, V., Bruni, R., Bianchi, A., Chiavarini, M., and Impicciatore, M. Comparative screening of plant essential oils: phenylpropanoid moiety as basic core for antiplatelet activity. Life Sci. 2-23-2006;78(13):1419-1432. PubMed
  7. Goun, E., Cunningham, G., Solodnikov, S., Krasnykch, O., and Miles, H. Antithrombin activity of some constituents from Origanum vulgare. Fitoterapia 2002;73(7-8):692-694. PubMed
  8. Lemhadri, A., Zeggwagh, N. A., Maghrani, M., Jouad, H., and Eddouks, M. Anti-hyperglycaemic activity of the aqueous extract of Origanum vulgare growing wild in Tafilalet region. J Ethnopharmacol. 2004;92(2-3):251-256. PubMed
  9. McCue, P., Vattem, D., and Shetty, K. Inhibitory effect of clonal oregano extracts against porcine pancreatic amylase in vitro. Asia Pac.J Clin.Nutr. 2004;13(4):401-408.
  10. Ragi, J., Pappert, A., Rao, B., Havkin-Frenkel, D., and Milgraum, S. Oregano extract ointment for wound healing: a randomized, double-blind, petrolatum-controlled study evaluating efficacy. J.Drugs Dermatol. 2011;10(10):1168-1172.
  11. Singletary K. Oregano: overview of the literature on health benefits. Nutrition Today 2010;45(3):129-38.
  12. Silva MLAE, Lucarini R, Dos Santos FF, et al. Hypoglycemic effect of rosmarinic acid-rich infusion (RosCE) from Origanum vulgare in alloxan-induced diabetic rats. Nat Prod Res 2022;36(17):4525-4531.

See these in context on the Oregano monograph →

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

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