Milk Thistle 100 mg Ingredients & Drug Interactions
What is this page for?
First and foremost: checking Milk Thistle 100 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
Milk Thistle 100 mg is a dietary supplement by Botanic Choice with 1 active ingredient. Its ingredients are commonly taken for liver health and protection, hepatitis, cirrhosis.Based on those ingredients, 954 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Milk Thistle extract. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.
Check Your Meds Against Milk Thistle 100 mg by Botanic Choice
Ask about any prescription or over-the-counter medication and we check it for interactions with Milk Thistle 100 mg by Botanic Choice — and tell you which ingredient is responsible.
AI summaries are generated from our interaction database for education only — always confirm with your pharmacist. How we use AI
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HelloPharmacist Scorecard of Milk Thistle 100 mg by Botanic Choice
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.
What’s inside
Full disclosure
This product contains one active ingredient: milk thistle extract at 100 mg per capsule. Milk thistle (also called silymarin) is a plant extract traditionally used to support liver function.
The capsule itself is made from gelatin, and the filler is rice flour.
Does it work?
Insufficient evidence
Milk thistle is possibly effective for type 2 diabetes — clinical research shows it can lower blood glucose levels. For acne, alcohol-related liver disease, allergic rhinitis (hay fever), gambling disorder, and amanita mushroom poisoning, the evidence we hold is insufficient to rate how well it works.
How safe is it?
Well-documented data
Milk thistle is generally well tolerated in most adults. The most common side effects are mild stomach issues — abdominal bloating, diarrhea, nausea, indigestion, and gas — but these don't occur more often than with placebo.
A small number of people have reported headache, dizziness, or sleep disturbances. Allergic reactions, including severe ones (anaphylaxis), are rare but have been reported.
One case described a person with severe stomach symptoms, sweating, and weakness after taking milk thistle; symptoms resolved within 24–48 hours and came back when the person took it again. During pregnancy, there isn't enough reliable safety data, so it's best avoided.
During breastfeeding, safety hasn't been well studied, so caution is advised. If you're pregnant, planning to become pregnant, or breastfeeding, talk with your doctor or pharmacist about whether this product is right for you.
Meds to double-check
Moderate interaction found
Before taking this product, double-check with your doctor or pharmacist if you take blood thinners like warfarin, diabetes medications, morphine, ledipasvir or sofosbuvir (hepatitis C drugs), sirolimus (an immunosuppressant), or any drugs metabolized by your liver. Milk thistle can change how these drugs work and may increase your risk of low blood sugar or bleeding.
The bottom line
Scorecard at a glanceFully disclosed formula with insufficient evidence for its stated purpose. Moderate medication interactions have been identified, and safety information is well characterized.
Milk thistle may help with type 2 diabetes blood sugar control, but it interacts with a wide range of medications — most notably blood thinners, diabetes drugs, and several liver-processed medications. If you take any prescription or over-the-counter drugs, check them against the interaction tool on this page and confirm with your pharmacist or doctor before you start.
Avoid it during pregnancy; use caution if breastfeeding.
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 Dec 22, 2017.
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
General information
Key facts about Milk Thistle 100 mg, straight from the product label.
| Brand | Botanic Choice |
|---|---|
| Barcode (UPC) | 703308090116 |
| Net contents | 50 Capsule(s) |
| Market status | On market |
| Date entered into DSLD | Dec 22, 2017 |
| DSLD ID | 77630 |
| Product type | Botanical |
| Supplement form | Capsule |
| Dietary claims / uses | All Other, Structure/Function |
| Intended target group(s) | Adult (18 - 50 Years), Gluten Free |
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 Milk Thistle 100 mg by Botanic Choice, sourced from the NIH Dietary Supplement Label Database.
Supplement Facts
| Ingredient | Amount | % DV |
|---|---|---|
| Milk Thistle extract | 100 mg | -- |
Other ingredients: Rice Flour, Gelatin Capsule
Tap any ingredient to jump to its full detail below.
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.
FDA Statement of Identity
Herbal Supplement
General Statements
Trusted since 1910 Essentials
Liver support
Actual pill size
Formula
Standardized extract 80% silymarin
Formulation
Gluten free Non GMO
Seals/Symbols
Non GMO
Suggested/Recommended/Usage/Directions
Suggested Use: Take 1 capsule daily, as a dietary supplement, or as directed by a physician.
Best if used by date on bottle.
Precautions
Warning: If you are taking any medications or are pregnant or nursing do not use prior to consulting a physician.
For your protection, this container has an outer safety seal. (Do not accept if missing or broken.)
Keep out of reach of children
FDA Disclaimer Statement
This statement has not been evaluated by the Food & Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.
Storage
Store in a dry, cool place.
Brand IP Statement(s)
IBG Indiana Botanic Gardens
General
C-105168
Is this label outdated? Report a formula or label change and our pharmacy team will review it.
Milk Thistle 100 mg by Botanic Choice label
The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.
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)The Ingredients in Milk Thistle 100 mg by Botanic Choice
This is the 1 active ingredient this product is made of. Select it to open its full monograph.
Serving size1 Capsule(s) Dosage formCapsule Amounts shown are per serving.
Milk Thistle extract
Interacts with954 drugs
Milk thistle is a popular herbal supplement most often used for liver health, and its main active component is a group of compounds called silymarin....
Milk Thistle extract monograph & interactionsOther (inactive) ingredients: Rice Flour, Gelatin Capsule. These complete the product’s ingredient list but are not active constituents.
Milk Thistle 100 mg by Botanic Choice Drug Interactions
HelloPharmacist Interaction Report
Botanic Choice Milk Thistle 100 mg interacts with medications through its milk thistle extract content.
The most serious documented interaction is with blood thinners like warfarin (Coumadin): a case report showed a patient's blood-thinning effect increased significantly after adding milk thistle, raising the risk of bleeding. Altogether, these interactions span 955 individual medications.
Read the full breakdown — every affected drug type, severity by severity
Milk thistle can affect how your body processes several drug types. It may lower blood sugar (hypoglycemia) when taken with diabetes medications — clinical research shows milk thistle itself can reduce blood glucose levels.
It may also increase levels of the hepatitis C drug ledipasvir and morphine, and theoretically affect drugs broken down by your liver through two major pathways: CYP2B6 substrates and glucuronidated drugs (those cleared via glucuronidation). It could decrease levels of the hepatitis C drug sofosbuvir, and it may slow clearance of the immunosuppressant sirolimus in certain patients.
If you take any medication, use the search tool below to check your exact drugs before starting milk thistle. Your doctor or pharmacist can tell you whether the interaction matters for your situation.
Check your own medications below · Editorial policy · How we use AI
Want to check YOUR meds against Milk Thistle 100 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 checkerIngredients driving the most interactions
Individual Drug Interactions
The ingredients in Milk Thistle 100 mg interact with 954 drugs. Click any drug to see the details.
1 of the 1 ingredient in Milk Thistle 100 mg interact with drugs. Each result below shows which ingredient is responsible. Milk Thistle extract
AcarboseGlucobay, Prandase, Precose
How Acarbose interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractAntidiabetes Drugs Moderate
Interaction Summary
Taking milk thistle with antidiabetes drugs may increase the risk of hypoglycemia.
Read the full Milk Thistle Extract + Acarbose interactionAcetaminophenChildren's Tylenol, Children's Tylenol Meltaways, Tylenol, Tylenol Ex Strength
How Acetaminophen interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractGlucuronidated Drugs Moderate
Interaction Summary
Theoretically, milk thistle might affect the clearance of drugs that undergo glucuronidation.
Read the full Milk Thistle Extract + Acetaminophen interactionAcetaminophen, AspirinGemnisyn
How Acetaminophen, Aspirin interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractGlucuronidated Drugs Moderate
Interaction Summary
Theoretically, milk thistle might affect the clearance of drugs that undergo glucuronidation.
Read the full Milk Thistle Extract + Acetaminophen, Aspirin interactionAcetaminophen, Aspirin, CaffeineExcedrin, Excedrin Extra Strength, Excedrin Migraine
How Acetaminophen, Aspirin, Caffeine interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractGlucuronidated Drugs, Cytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, milk thistle might affect the clearance of drugs that undergo glucuronidation.
Read the full Milk Thistle Extract + Acetaminophen, Aspirin, Caffeine interactionAcetaminophen, Brompheniramine, PhenylpropanolamineDimetapp Cold and Flu
How Acetaminophen, Brompheniramine, Phenylpropanolamine interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractGlucuronidated Drugs Moderate
Interaction Summary
Theoretically, milk thistle might affect the clearance of drugs that undergo glucuronidation.
Read the full Milk Thistle Extract + Acetaminophen, Brompheniramine, Phenylpropanolamine interactionAcetaminophen, ButalbitalAxocet, Bancap, Bucet, Butex Forte, Esgic CF, Orbivan CF +5 more
How Acetaminophen, Butalbital interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractGlucuronidated Drugs Moderate
Interaction Summary
Theoretically, milk thistle might affect the clearance of drugs that undergo glucuronidation.
Read the full Milk Thistle Extract + Acetaminophen, Butalbital interactionAcetaminophen, Butalbital, CaffeineEsgic, Esgic Plus, Fiogesic, Fioricet, Repan, Tecnal +1 more
How Acetaminophen, Butalbital, Caffeine interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractGlucuronidated Drugs, Cytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, milk thistle might affect the clearance of drugs that undergo glucuronidation.
Read the full Milk Thistle Extract + Acetaminophen, Butalbital, Caffeine interactionAcetaminophen, Butalbital, Caffeine, CodeineEsgic with Codeine, Fioricet w/ Codeine
How Acetaminophen, Butalbital, Caffeine, Codeine interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractCytochrome P450 3a4 (cyp3a4) Substrates, Glucuronidated Drugs Moderate
Interaction Summary
It is unclear if milk thistle inhibits CYP3A4; research is conflicting.
Read the full Milk Thistle Extract + Acetaminophen, Butalbital, Caffeine, Codeine interactionAcetaminophen, Butalbital, CodeineBancap w/ Codeine
How Acetaminophen, Butalbital, Codeine interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractGlucuronidated Drugs Moderate
Interaction Summary
Theoretically, milk thistle might affect the clearance of drugs that undergo glucuronidation.
Read the full Milk Thistle Extract + Acetaminophen, Butalbital, Codeine interactionAcetaminophen, Butalbital, Codeine PhosphatePhrenilin #3
How Acetaminophen, Butalbital, Codeine Phosphate interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractGlucuronidated Drugs Moderate
Interaction Summary
Theoretically, milk thistle might affect the clearance of drugs that undergo glucuronidation.
Read the full Milk Thistle Extract + Acetaminophen, Butalbital, Codeine Phosphate interactionAcetaminophen, Caffeine, Chlorpheniramine, Hydrocodone, PhenylephrineHycomine Compound
How Acetaminophen, Caffeine, Chlorpheniramine, Hydrocodone, Phenylephrine interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractGlucuronidated Drugs, Cytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, milk thistle might affect the clearance of drugs that undergo glucuronidation.
Read the full Milk Thistle Extract + Acetaminophen, Caffeine, Chlorpheniramine, Hydrocodone, Phenylephrine interactionAcetaminophen, Caffeine, CodeineGesic C15, Gesic C30, Gesic C8, Lenoltec 1, Lenoltec 2, Lenoltec 3 +1 more
How Acetaminophen, Caffeine, Codeine interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractCytochrome P450 3a4 (cyp3a4) Substrates, Glucuronidated Drugs Moderate
Interaction Summary
It is unclear if milk thistle inhibits CYP3A4; research is conflicting.
Read the full Milk Thistle Extract + Acetaminophen, Caffeine, Codeine interactionAcetaminophen, Caffeine, Codeine, SalicylamideCodalan No.1, Codalan No.2, Codalan No.3
How Acetaminophen, Caffeine, Codeine, Salicylamide interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractGlucuronidated Drugs, Cytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, milk thistle might affect the clearance of drugs that undergo glucuronidation.
Read the full Milk Thistle Extract + Acetaminophen, Caffeine, Codeine, Salicylamide interactionAcetaminophen, Caffeine, DihydrocodeineDHC Plus, Panlor DC, Panlor SS
How Acetaminophen, Caffeine, Dihydrocodeine interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractCytochrome P450 3a4 (cyp3a4) Substrates, Glucuronidated Drugs Moderate
Interaction Summary
It is unclear if milk thistle inhibits CYP3A4; research is conflicting.
Read the full Milk Thistle Extract + Acetaminophen, Caffeine, Dihydrocodeine interactionAcetaminophen, Caffeine, IsomethepteneMigralam
How Acetaminophen, Caffeine, Isometheptene interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractGlucuronidated Drugs, Cytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, milk thistle might affect the clearance of drugs that undergo glucuronidation.
Read the full Milk Thistle Extract + Acetaminophen, Caffeine, Isometheptene interactionAcetaminophen, Caffeine, PyrilamineMidol Max Strength Menstrual
How Acetaminophen, Caffeine, Pyrilamine interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractCytochrome P450 3a4 (cyp3a4) Substrates, Glucuronidated Drugs Moderate
Interaction Summary
It is unclear if milk thistle inhibits CYP3A4; research is conflicting.
Read the full Milk Thistle Extract + Acetaminophen, Caffeine, Pyrilamine interactionAcetaminophen, Chlorpheniramine Maleate, Dextromethorphan HbrVicks Formula 44M Cough, Cold & Flu Relief
How Acetaminophen, Chlorpheniramine Maleate, Dextromethorphan Hbr interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractCytochrome P450 3a4 (cyp3a4) Substrates, Glucuronidated Drugs Moderate
Interaction Summary
It is unclear if milk thistle inhibits CYP3A4; research is conflicting.
Read the full Milk Thistle Extract + Acetaminophen, Chlorpheniramine Maleate, Dextromethorphan Hbr interactionAcetaminophen, Chlorpheniramine, Codeine, PhenylephrineColrex
How Acetaminophen, Chlorpheniramine, Codeine, Phenylephrine interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractGlucuronidated Drugs, Cytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, milk thistle might affect the clearance of drugs that undergo glucuronidation.
Read the full Milk Thistle Extract + Acetaminophen, Chlorpheniramine, Codeine, Phenylephrine interactionAcetaminophen, Chlorpheniramine, DextromethorphanCoricidin II Extra Strength Cold and Flu
How Acetaminophen, Chlorpheniramine, Dextromethorphan interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractGlucuronidated Drugs, Cytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, milk thistle might affect the clearance of drugs that undergo glucuronidation.
Read the full Milk Thistle Extract + Acetaminophen, Chlorpheniramine, Dextromethorphan interactionAcetaminophen, Chlorpheniramine, Dextromethorphan HydrobromideCoricidin HBP Maximum Strength Flu
How Acetaminophen, Chlorpheniramine, Dextromethorphan Hydrobromide interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractCytochrome P450 3a4 (cyp3a4) Substrates, Glucuronidated Drugs Moderate
Interaction Summary
It is unclear if milk thistle inhibits CYP3A4; research is conflicting.
Read the full Milk Thistle Extract + Acetaminophen, Chlorpheniramine, Dextromethorphan Hydrobromide interactionAcetaminophen, Chlorpheniramine, Dextromethorphan, PhenylpropanolamineMulti Symptom Cold Relief
How Acetaminophen, Chlorpheniramine, Dextromethorphan, Phenylpropanolamine interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractCytochrome P450 3a4 (cyp3a4) Substrates, Glucuronidated Drugs Moderate
Interaction Summary
It is unclear if milk thistle inhibits CYP3A4; research is conflicting.
Read the full Milk Thistle Extract + Acetaminophen, Chlorpheniramine, Dextromethorphan, Phenylpropanolamine interactionAcetaminophen, Chlorpheniramine, Dextromethorphan, PseudoephedrineChildren's Tylenol Cold Plus Cough, Tylenol Cold Ex Strength
How Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractGlucuronidated Drugs, Cytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, milk thistle might affect the clearance of drugs that undergo glucuronidation.
Read the full Milk Thistle Extract + Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine interactionAcetaminophen, Chlorpheniramine, Guaifenesin, Phenylephrine, SalicylamideRhinogesic GG
How Acetaminophen, Chlorpheniramine, Guaifenesin, Phenylephrine, Salicylamide interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractGlucuronidated Drugs, Cytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, milk thistle might affect the clearance of drugs that undergo glucuronidation.
Read the full Milk Thistle Extract + Acetaminophen, Chlorpheniramine, Guaifenesin, Phenylephrine, Salicylamide interactionAcetaminophen, Chlorpheniramine, PhenylephrineAlka-Seltzer PLUS, Histex SR, Protid
How Acetaminophen, Chlorpheniramine, Phenylephrine interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractGlucuronidated Drugs, Cytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, milk thistle might affect the clearance of drugs that undergo glucuronidation.
Read the full Milk Thistle Extract + Acetaminophen, Chlorpheniramine, Phenylephrine interactionAcetaminophen, Chlorpheniramine, Phenylephrine, SalicylamideRhinogesic, Rhinogesic JR
How Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractGlucuronidated Drugs, Cytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, milk thistle might affect the clearance of drugs that undergo glucuronidation.
Read the full Milk Thistle Extract + Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide interactionAcetaminophen, Chlorpheniramine, PhenylpropanolamineAlumadrine, Conex, Sinadrin Max Strength, Sinulin
How Acetaminophen, Chlorpheniramine, Phenylpropanolamine interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractCytochrome P450 3a4 (cyp3a4) Substrates, Glucuronidated Drugs Moderate
Interaction Summary
It is unclear if milk thistle inhibits CYP3A4; research is conflicting.
Read the full Milk Thistle Extract + Acetaminophen, Chlorpheniramine, Phenylpropanolamine interactionAcetaminophen, Chlorpheniramine, Phenylpropanolamine, OpiumHista-Derfule
How Acetaminophen, Chlorpheniramine, Phenylpropanolamine, Opium interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractGlucuronidated Drugs, Cytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, milk thistle might affect the clearance of drugs that undergo glucuronidation.
Read the full Milk Thistle Extract + Acetaminophen, Chlorpheniramine, Phenylpropanolamine, Opium interactionAcetaminophen, Chlorpheniramine, Phenylpropanolamine, PhenyltoloxamineNorel Plus
How Acetaminophen, Chlorpheniramine, Phenylpropanolamine, Phenyltoloxamine interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractCytochrome P450 3a4 (cyp3a4) Substrates, Glucuronidated Drugs Moderate
Interaction Summary
It is unclear if milk thistle inhibits CYP3A4; research is conflicting.
Read the full Milk Thistle Extract + Acetaminophen, Chlorpheniramine, Phenylpropanolamine, Phenyltoloxamine interactionAcetaminophen, Chlorpheniramine, PseudoephedrineAlka-Seltzer PLUS Liquid Gels, Children's Tylenol Cold, Codimal, Comtrex, Extra Strength Tylenol Allergy Sinus, Lorsin +3 more
How Acetaminophen, Chlorpheniramine, Pseudoephedrine interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractGlucuronidated Drugs, Cytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Theoretically, milk thistle might affect the clearance of drugs that undergo glucuronidation.
Read the full Milk Thistle Extract + Acetaminophen, Chlorpheniramine, Pseudoephedrine interactionAcetaminophen, ChlorzoxazoneAcetazone Forte, Extra Strength Tylenol Aches & Strains, Parafon Forte
How Acetaminophen, Chlorzoxazone interacts with Milk Thistle 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Milk Thistle ExtractGlucuronidated Drugs Moderate
Interaction Summary
Theoretically, milk thistle might affect the clearance of drugs that undergo glucuronidation.
Read the full Milk Thistle Extract + Acetaminophen, Chlorzoxazone interactionEach ingredient & the kinds of drugs it affects
For each ingredient in Milk Thistle 100 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.
Milk Thistle extract
Antidiabetes Drugs
Taking milk thistle with antidiabetes drugs may increase the risk of hypoglycemia.
Clinical research shows that milk thistle extract, alone or along with tree turmeric extract, can lower blood glucose levels and glycated hemoglobin (HbA1c) in patients with type 2 diabetes, including those already taking antidiabetes drugs. Additionally, animal research shows that milk thistle extract increases the metformin maximum plasma concentration and area under the curve and decreases the renal clearance of metformin, due to inhibition of the multi-drug and toxin extrusion protein 1 (MATE1) renal tubular transport protein.
Cytochrome P450 2B6 (Cyp2B6) Substrates
Theoretically, milk thistle might inhibit CYP2B6.
An in vitro study shows that silybin, a constituent of milk thistle, binds to and noncompetitively inhibits CYP2B6. Additionally, silybin might downregulate the expression of CYP2B6 by decreasing mRNA and protein levels.
Glucuronidated Drugs
Theoretically, milk thistle might affect the clearance of drugs that undergo glucuronidation.
Laboratory research shows that milk thistle constituents inhibit uridine diphosphoglucuronosyl transferase (UGT), the major phase 2 enzyme that is responsible for glucuronidation. Theoretically, this could decrease the clearance and increase levels of glucuronidated drugs. Other laboratory research suggests that a milk thistle extract of silymarin might inhibit beta-glucuronidase, although the significance of this effect is unclear.
Ledipasvir
Theoretically, milk thistle might increase the levels and clinical effects of ledipasvir.
Animal research in rats shows that milk thistle increases the area under the curve (AUC) for ledipasvir and slows its elimination.
Morphine
Theoretically, concomitant use of milk thistle with morphine might affect serum levels of morphine and either increase or decrease its effects.
Animal research shows that milk thistle reduces serum levels of morphine by up to 66%. In contrast, laboratory research shows that milk thistle constituents inhibit uridine diphosphoglucuronosyl transferase (UGT), the major phase 2 enzyme that is responsible for glucuronidation. Theoretically, this could decrease the clearance and increase morphine levels. The effect of taking milk thistle on morphine metabolism in humans is not known.
Raloxifene (Evista)
Theoretically, milk thistle might decrease the clearance and increase levels of raloxifene.
Laboratory research suggests that the milk thistle constituents silibinin and silymarin inhibit the glucuronidation of raloxifene in the intestines.
Sirolimus (Rapamune)
Milk thistle might decrease the clearance of sirolimus.
Pharmacokinetic research shows that a milk thistle extract of silymarin decreases the apparent clearance of sirolimus in hepatically impaired renal transplant patients. It is unclear if this interaction occurs in patients without hepatic impairment.
Sofosbuvir (Solvaldi)
Theoretically, milk thistle might decrease the levels and clinical effects of sofosbuvir.
Animal research in rats shows that milk thistle reduces the metabolism of sofosbuvir, as well as the hepatic uptake of its active metabolite.
Tamoxifen (Nolvadex)
Theoretically, the milk thistle constituent silibinin might increase tamoxifen levels and interfere with its conversion to an active metabolite.
Animal research suggests that the milk thistle constituent silibinin might increase plasma levels of tamoxifen and alter its conversion to an active metabolite. The mechanism appears to involve inhibition of pre-systemic metabolism of tamoxifen by cytochrome P450 (CYP) 2C9 and CYP3A4, and inhibition of P-glycoprotein-mediated efflux of tamoxifen into the intestine for excretion. Whether this interaction occurs in humans is not known.
Warfarin (Coumadin)
Theoretically, milk thistle might increase the effects of warfarin.
In one case report, a man stabilized on warfarin experienced an increase in INR from 2.64 to 4.12 after taking a combination product containing milk thistle 200 mg daily, as well as dandelion, wild yam, niacinamide, and vitamin B12. Levels returned to normal after stopping the supplement. Although a direct correlation between milk thistle and the change in INR cannot be confirmed, some in vitro research suggests that milk thistle might inhibit cytochrome P450 2C9 (CYP2C9), an enzyme involved in the metabolism of various drugs, including warfarin.
Cytochrome P450 2C9 (Cyp2C9) Substrates
It is unclear if milk thistle inhibits CYP2C9; research is conflicting.
In vitro research suggests that milk thistle might inhibit CYP2C9. Additionally, 3 case reports from the World Health Organization (WHO) adverse drug reaction database describe increased toxicity in patients taking milk thistle and cancer medications that are CYP2C9 substrates, including imatinib and capecitabine. However, contradictory clinical research shows that milk thistle extract does not inhibit CYP2C9 or significantly affect levels of the CYP2C9 substrate tolbutamide. Differences in results could be due to differences in dosages or formulations utilized.
Cytochrome P450 3A4 (Cyp3A4) Substrates
It is unclear if milk thistle inhibits CYP3A4; research is conflicting.
While laboratory research shows conflicting results, pharmacokinetic research shows that taking milk thistle extract 420-1350 mg daily does not significantly affect the metabolism of the CYP3A4 substrates irinotecan, midazolam, or indinavir. However, 8 case reports from the World Health Organization (WHO) adverse drug reaction database describe increased toxicity in patients taking milk thistle and cancer medications that are CYP3A4 substrates, including gefitinib, sorafenib, doxorubicin, and vincristine.
Estrogens
Theoretically, milk thistle might interfere with estrogen therapy through competition for estrogen receptors.
Animal research suggests that a milk thistle extract of silymarin binds to estrogen receptor beta.
Hmg-Coa Reductase Inhibitors ("Statins")
Theoretically, milk thistle might interfere with statin therapy by decreasing the activity of organic anion transporting polypeptide 1B1 (OATB1B1) and inhibiting breast cancer resistance protein (BCRP).
Preliminary evidence suggests that a milk thistle extract of silymarin can decrease the activity of the OATP1B1, which transports HMG-CoA reductase inhibitors into the liver to their site of action, and animal research shows this increases the maximum plasma concentration of pitavastatin and pravastatin. The silibinin component also inhibits BCRP, which transports statins from the liver into the bile for excretion. However, in a preliminary study in healthy males, silymarin 140 mg three times daily had no effect on the pharmacokinetics of a single 10 mg dose of rosuvastatin.
Indinavir (Crixivan)
Theoretically, milk thistle may induce cytochrome P450 3A4 (CYP3A4) enzymes and increase the metabolism of indinavir; however, results are conflicting.
One pharmacokinetic study shows that taking milk thistle (Standardized Milk Thistle, General Nutrition Corp.) 175 mg three times daily in combination with multiple doses of indinavir 800 mg every 8 hours decreases the mean trough levels of indinavir by 25%. However, results from the same pharmacokinetic study show that milk thistle does not affect the overall exposure to indinavir. Furthermore, two other pharmacokinetic studies show that taking specific milk thistle extract (Legalon, Rottapharm Madaus; Thisilyn, Nature's Way) 160-450 mg every 8 hours in combination with multiple doses of indinavir 800 mg every 8 hours does not reduce levels of indinavir.
Organic Anion-Transporting Polypeptide Substrates (Oatp)
Milk thistle may inhibit one form of OATP, OATP-B1, which could reduce the bioavailability and clinical effects of OATP-B1 substrates.
In vitro research shows that milk thistle inhibits OATP-B1. Two case reports from the World Health Organization (WHO) adverse drug reaction database describe increased toxicity in patients taking milk thistle and cancer medications that are OATP substrates, including sorafenib and methotrexate. OATPs are expressed in the small intestine and liver and are responsible for the uptake of drugs and other compounds into the body. Inhibition of OATP may reduce the bioavailability of oral drugs that are substrates of OATP.
P-Glycoprotein Substrates
Theoretically, milk thistle might increase the absorption of P-glycoprotein substrates. However, this effect does not seem to be clinically significant.
In vitro research shows that milk thistle can inhibit P-glycoprotein activity and 1 case report from the World Health Organization (WHO) adverse drug reaction database describes increased abdominal pain in a patient taking milk thistle and the cancer medication vincristine, a P-glycoprotein substrate, though this patient was also taking methotrexate. However, a small pharmacokinetic study in healthy volunteers shows that taking milk thistle (Enzymatic Therapy Inc.) 900 mg, standardized to 80% silymarin, in 3 divided doses daily for 14 days does not affect absorption of digoxin, a P-glycoprotein substrate.
Brand information
Manufacturer and brand details for Milk Thistle 100 mg, from the product label.
Botanic Choice
See all Botanic Choice products- Name
- Indiana Botanic Gardens, Inc.
- Street Address
- 3401 W. 37th Ave.
- City
- Hobart
- State
- IN
- ZipCode
- 46342
- Phone Number
- 1-800-644-8327
- Web Address
- www.botanicchoice.com
Milk Thistle 100 mg by Botanic Choice: Common Questions
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The Full Monographs Behind Milk Thistle 100 mg’s Ingredients
Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.
Sources & How We Checked
Milk Thistle 100 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.
- NIH Dietary Supplement Label Database (DSLD) — The official product label on file for this supplement.
- Natural Medicines (Therapeutic Research Center) — Evidence-graded clinical reference behind the ingredient interaction data.
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 69 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.
Milk Thistle 69 references
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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.
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