Western Red Cedar Ingredients & Drug Interactions
by Hawaii Pharm
What is this page for?
First and foremost: checking Western Red Cedar 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
Western Red Cedar is a dietary supplement by Hawaii Pharm with 1 active ingredient. Its ingredients are commonly taken for warts and skin growths, respiratory and immune support, cold and upper respiratory symptoms.Based on those ingredients, 576 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Western Red Cedar Leaf Extract, Dry. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.
Check Your Meds Against Western Red Cedar by Hawaii Pharm
Ask about any prescription or over-the-counter medication and we check it for interactions with Western Red Cedar by Hawaii Pharm — 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
Ask the Pharmacist
A licensed pharmacist will answer your question by email — free, usually within 24 hours.
Got it — thank you!
A licensed pharmacist will answer within 24 hours. Keep an eye on your email (worth checking spam, just in case).
HelloPharmacist Scorecard of Western Red Cedar by Hawaii Pharm
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: Western Red Cedar Leaf Extract (in dried form), also known as thuja. The liquid also includes alcohol, water, and glycerin as inactive ingredients.
Does it work?
Couldn't assess
The evidence for Western Red Cedar against the common cold is insufficient — we don't have reliable data showing it works for that purpose.
How safe is it?
Well-documented data
Thuja contains thujone, a neurotoxic compound that can cause serious harm in large doses. High amounts have been reported to cause headache, nervous agitation, seizures, stomach upset, vomiting, abdominal pain, diarrhea, and in rare cases liver damage, kidney damage, and death.
Some people have also developed contact dermatitis (an itchy rash) from handling thuja plants due to limonene, one of its components. The safety data advises against use in pregnancy — thuja was traditionally used to trigger uterine contractions and menstruation.
It's also advised against while breastfeeding, as safety hasn't been established.
Meds to double-check
Moderate interaction found
Do not use this product if you take seizure threshold lowering drugs (such as certain anesthetics), immunosuppressants (like cyclosporine, tacrolimus, or mycophenolate), or anticonvulsants (seizure medications). All three categories carry Moderate severity interactions with thuja's thujone content.
Check your exact medications with the tool on this page before considering it.
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.
Western Red Cedar is not recommended if you take seizure threshold lowering drugs, immunosuppressants, or anticonvulsants — the interactions are serious and we advise you to avoid it. Even outside of medications, thuja carries a real risk of toxicity at higher doses.
Talk to your pharmacist before using this product, and skip it entirely if you're pregnant or 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 Sep 25, 2025.
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 Western Red Cedar, straight from the product label.
| Brand | Hawaii Pharm |
|---|---|
| Barcode (UPC) | 840253654977 |
| Net contents | 4 Fluid Ounce(s); 120 Milliliter(s) |
| Market status | On market |
| Date entered into DSLD | Sep 25, 2025 |
| DSLD ID | 332103 |
| Product type | Botanical |
| Supplement form | Liquid |
| 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 Western Red Cedar by Hawaii Pharm, sourced from the NIH Dietary Supplement Label Database.
Supplement Facts
| Ingredient | Amount | % DV |
|---|---|---|
| Western Red Cedar Leaf Extract, Dry | 983 mg | -- |
Other ingredients: Alcohol, Water, Glycerin
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.
Brand IP Statement(s)
Hawaii Pharm Herbal Extract Highest quality since 2008
Suggested/Recommended/Usage/Directions
Suggested use: Shake well before using. For adults add about 20-30 drops (0.7-1 ml, one full squeeze of the dropper bulb) to some juice or water, up to 4 times a day.
Precautions
Warning: We recommend to seek expert medical advice before taking.
Do not use if you are allergic to any ingredients.
Consult your physician before giving to children under 18, during pregnancy, if nursing or taking medications.
Consult your physician before giving to children under 18, during pregnancy, if nursing or taking medications.
May affect the ability to drive and operate machinery. May have contraindications, can cause side effects and adverse reactions. Do not use if seal is broken or missing.
Keep out of the reach of children!
Storage
Store in a cool dry place.
Formulation
Made in compliance with cGMP 21 CFR 111 in an FDA registered and inspected facility.
Only natural ingredients Identity and purity is laboratory verified
All the raw materials are gluten-free by their nature No artificial colors, flavors, or preservatives
Organic alcohol based
Made in USA, Hawaii
FDA Disclaimer Statement
This product has not been evaluated by the FDA and is not intended to diagnose, treat, cure or prevent any disease.
General Statements
Scan this QR code to get more info or reorder www.Hawaiipharm.com
Formula
Thuja plicata
Organic alcohol based
FDA Statement of Identity
Herbal Supplement
Seals/Symbols
USA Made in United States of America
Is this label outdated? Report a formula or label change and our pharmacy team will review it.
Western Red Cedar by Hawaii Pharm 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 Western Red Cedar by Hawaii Pharm
This is the 1 active ingredient this product is made of. Select it to open its full monograph.
Serving size0.7 Milliliter(s) Dosage formLiquid Servings per container120 Amounts shown are per serving.
Western Red Cedar Leaf Extract, Dry
Interacts with576 drugs
Thuja, also called northern white cedar or arborvitae, is a tree whose leaf and oil have a long history in folk and homeopathic medicine, especially f...
Western Red Cedar Leaf Extract, Dry monograph & interactionsOther (inactive) ingredients: Alcohol, Water, Glycerin. These complete the product’s ingredient list but are not active constituents.
Western Red Cedar by Hawaii Pharm Drug Interactions
HelloPharmacist Interaction Report
Western Red Cedar Liquid by Hawaii Pharm contains thuja extract, which interacts with medications in three major drug categories.
The most serious concern is seizure threshold lowering drugs (anesthetics and others) — thuja contains thujone, a compound that may lower your seizure risk, so combining it with these medications could theoretically increase the chance of a seizure. The product carries a Moderate severity warning and we advise avoiding it if you take these drugs.
Read the full breakdown — every affected drug type, severity by severity
Thuja also interacts with immunosuppressants (drugs that calm your immune system, like cyclosporine, tacrolimus, and mycophenolate) at Moderate severity — the herb may stimulate immune function and reduce how well these medications work. It similarly interacts with anticonvulsants (seizure medications) at Moderate severity; thujone may lower the seizure threshold and decrease their effectiveness.
Altogether, these interactions span 571 individual medications. We have no data on ingredients we could not check.
Before you start this product, run your exact medications through the interaction checker on this page.
Check your own medications below · Editorial policy · How we use AI
Want to check YOUR meds against Western Red Cedar?
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 Western Red Cedar interact with 576 drugs. Click any drug to see the details.
1 of the 1 ingredient in Western Red Cedar interact with drugs. Each result below shows which ingredient is responsible. Western Red Cedar Leaf Extract, Dry
6-mercaptopurinePurinethol
How 6-mercaptopurine interacts with Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DryImmunosuppressants Moderate
Interaction Summary
Thuja might stimulate immune function.
Read the full Western Red Cedar Leaf Extract, Dry + 6-mercaptopurine interactionAbrocitinibCibinqo
How Abrocitinib interacts with Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DryImmunosuppressants Moderate
Interaction Summary
Thuja might stimulate immune function.
Read the full Western Red Cedar Leaf Extract, Dry + Abrocitinib interactionAcetaminophen, Brompheniramine, PhenylpropanolamineDimetapp Cold and Flu
How Acetaminophen, Brompheniramine, Phenylpropanolamine interacts with Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DrySeizure Threshold Lowering Drugs Moderate
Interaction Summary
Thuja products can contains significant amounts of thujone, a neurotoxin.
Read the full Western Red Cedar Leaf Extract, Dry + Acetaminophen, Brompheniramine, Phenylpropanolamine interactionAcetaminophen, Butalbital, Caffeine, CodeineEsgic with Codeine, Fioricet w/ Codeine
How Acetaminophen, Butalbital, Caffeine, Codeine interacts with Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DrySeizure Threshold Lowering Drugs Moderate
Interaction Summary
Thuja products can contains significant amounts of thujone, a neurotoxin.
Read the full Western Red Cedar Leaf Extract, Dry + Acetaminophen, Butalbital, Caffeine, Codeine interactionAcetaminophen, Butalbital, CodeineBancap w/ Codeine
How Acetaminophen, Butalbital, Codeine interacts with Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DrySeizure Threshold Lowering Drugs Moderate
Interaction Summary
Thuja products can contains significant amounts of thujone, a neurotoxin.
Read the full Western Red Cedar Leaf Extract, Dry + Acetaminophen, Butalbital, Codeine interactionAcetaminophen, Butalbital, Codeine PhosphatePhrenilin #3
How Acetaminophen, Butalbital, Codeine Phosphate interacts with Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DrySeizure Threshold Lowering Drugs Moderate
Interaction Summary
Thuja products can contains significant amounts of thujone, a neurotoxin.
Read the full Western Red Cedar Leaf Extract, Dry + Acetaminophen, Butalbital, Codeine Phosphate interactionAcetaminophen, Caffeine, Chlorpheniramine, Hydrocodone, PhenylephrineHycomine Compound
How Acetaminophen, Caffeine, Chlorpheniramine, Hydrocodone, Phenylephrine interacts with Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DrySeizure Threshold Lowering Drugs Moderate
Interaction Summary
Thuja products can contains significant amounts of thujone, a neurotoxin.
Read the full Western Red Cedar Leaf Extract, Dry + 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 Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DrySeizure Threshold Lowering Drugs Moderate
Interaction Summary
Thuja products can contains significant amounts of thujone, a neurotoxin.
Read the full Western Red Cedar Leaf Extract, Dry + Acetaminophen, Caffeine, Codeine interactionAcetaminophen, Caffeine, Codeine, SalicylamideCodalan No.1, Codalan No.2, Codalan No.3
How Acetaminophen, Caffeine, Codeine, Salicylamide interacts with Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DrySeizure Threshold Lowering Drugs Moderate
Interaction Summary
Thuja products can contains significant amounts of thujone, a neurotoxin.
Read the full Western Red Cedar Leaf Extract, Dry + Acetaminophen, Caffeine, Codeine, Salicylamide interactionAcetaminophen, Caffeine, DihydrocodeineDHC Plus, Panlor DC, Panlor SS
How Acetaminophen, Caffeine, Dihydrocodeine interacts with Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DrySeizure Threshold Lowering Drugs Moderate
Interaction Summary
Thuja products can contains significant amounts of thujone, a neurotoxin.
Read the full Western Red Cedar Leaf Extract, Dry + Acetaminophen, Caffeine, Dihydrocodeine interactionAcetaminophen, Chlorpheniramine Maleate, Dextromethorphan HbrVicks Formula 44M Cough, Cold & Flu Relief
How Acetaminophen, Chlorpheniramine Maleate, Dextromethorphan Hbr interacts with Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DrySeizure Threshold Lowering Drugs Moderate
Interaction Summary
Thuja products can contains significant amounts of thujone, a neurotoxin.
Read the full Western Red Cedar Leaf Extract, Dry + Acetaminophen, Chlorpheniramine Maleate, Dextromethorphan Hbr interactionAcetaminophen, Chlorpheniramine, Codeine, PhenylephrineColrex
How Acetaminophen, Chlorpheniramine, Codeine, Phenylephrine interacts with Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DrySeizure Threshold Lowering Drugs Moderate
Interaction Summary
Thuja products can contains significant amounts of thujone, a neurotoxin.
Read the full Western Red Cedar Leaf Extract, Dry + Acetaminophen, Chlorpheniramine, Codeine, Phenylephrine interactionAcetaminophen, Chlorpheniramine, DextromethorphanCoricidin II Extra Strength Cold and Flu
How Acetaminophen, Chlorpheniramine, Dextromethorphan interacts with Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DrySeizure Threshold Lowering Drugs Moderate
Interaction Summary
Thuja products can contains significant amounts of thujone, a neurotoxin.
Read the full Western Red Cedar Leaf Extract, Dry + Acetaminophen, Chlorpheniramine, Dextromethorphan interactionAcetaminophen, Chlorpheniramine, Dextromethorphan HydrobromideCoricidin HBP Maximum Strength Flu
How Acetaminophen, Chlorpheniramine, Dextromethorphan Hydrobromide interacts with Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DrySeizure Threshold Lowering Drugs Moderate
Interaction Summary
Thuja products can contains significant amounts of thujone, a neurotoxin.
Read the full Western Red Cedar Leaf Extract, Dry + Acetaminophen, Chlorpheniramine, Dextromethorphan Hydrobromide interactionAcetaminophen, Chlorpheniramine, Dextromethorphan, PhenylpropanolamineMulti Symptom Cold Relief
How Acetaminophen, Chlorpheniramine, Dextromethorphan, Phenylpropanolamine interacts with Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DrySeizure Threshold Lowering Drugs Moderate
Interaction Summary
Thuja products can contains significant amounts of thujone, a neurotoxin.
Read the full Western Red Cedar Leaf Extract, Dry + Acetaminophen, Chlorpheniramine, Dextromethorphan, Phenylpropanolamine interactionAcetaminophen, Chlorpheniramine, Dextromethorphan, PseudoephedrineChildren's Tylenol Cold Plus Cough, Tylenol Cold Ex Strength
How Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine interacts with Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DrySeizure Threshold Lowering Drugs Moderate
Interaction Summary
Thuja products can contains significant amounts of thujone, a neurotoxin.
Read the full Western Red Cedar Leaf Extract, Dry + Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine interactionAcetaminophen, Chlorpheniramine, Guaifenesin, Phenylephrine, SalicylamideRhinogesic GG
How Acetaminophen, Chlorpheniramine, Guaifenesin, Phenylephrine, Salicylamide interacts with Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DrySeizure Threshold Lowering Drugs Moderate
Interaction Summary
Thuja products can contains significant amounts of thujone, a neurotoxin.
Read the full Western Red Cedar Leaf Extract, Dry + Acetaminophen, Chlorpheniramine, Guaifenesin, Phenylephrine, Salicylamide interactionAcetaminophen, Chlorpheniramine, PhenylephrineAlka-Seltzer PLUS, Histex SR, Protid
How Acetaminophen, Chlorpheniramine, Phenylephrine interacts with Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DrySeizure Threshold Lowering Drugs Moderate
Interaction Summary
Thuja products can contains significant amounts of thujone, a neurotoxin.
Read the full Western Red Cedar Leaf Extract, Dry + Acetaminophen, Chlorpheniramine, Phenylephrine interactionAcetaminophen, Chlorpheniramine, Phenylephrine, SalicylamideRhinogesic, Rhinogesic JR
How Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide interacts with Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DrySeizure Threshold Lowering Drugs Moderate
Interaction Summary
Thuja products can contains significant amounts of thujone, a neurotoxin.
Read the full Western Red Cedar Leaf Extract, Dry + Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide interactionAcetaminophen, Chlorpheniramine, PhenylpropanolamineAlumadrine, Conex, Sinadrin Max Strength, Sinulin
How Acetaminophen, Chlorpheniramine, Phenylpropanolamine interacts with Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DrySeizure Threshold Lowering Drugs Moderate
Interaction Summary
Thuja products can contains significant amounts of thujone, a neurotoxin.
Read the full Western Red Cedar Leaf Extract, Dry + Acetaminophen, Chlorpheniramine, Phenylpropanolamine interactionAcetaminophen, Chlorpheniramine, Phenylpropanolamine, OpiumHista-Derfule
How Acetaminophen, Chlorpheniramine, Phenylpropanolamine, Opium interacts with Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DrySeizure Threshold Lowering Drugs Moderate
Interaction Summary
Thuja products can contains significant amounts of thujone, a neurotoxin.
Read the full Western Red Cedar Leaf Extract, Dry + Acetaminophen, Chlorpheniramine, Phenylpropanolamine, Opium interactionAcetaminophen, Chlorpheniramine, Phenylpropanolamine, PhenyltoloxamineNorel Plus
How Acetaminophen, Chlorpheniramine, Phenylpropanolamine, Phenyltoloxamine interacts with Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DrySeizure Threshold Lowering Drugs Moderate
Interaction Summary
Thuja products can contains significant amounts of thujone, a neurotoxin.
Read the full Western Red Cedar Leaf Extract, Dry + 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 Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DrySeizure Threshold Lowering Drugs Moderate
Interaction Summary
Thuja products can contains significant amounts of thujone, a neurotoxin.
Read the full Western Red Cedar Leaf Extract, Dry + Acetaminophen, Chlorpheniramine, Pseudoephedrine interactionAcetaminophen, Chlorzoxazone, CodeineAcetazone Forte C8, Parafon Forte C8
How Acetaminophen, Chlorzoxazone, Codeine interacts with Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DrySeizure Threshold Lowering Drugs Moderate
Interaction Summary
Thuja products can contains significant amounts of thujone, a neurotoxin.
Read the full Western Red Cedar Leaf Extract, Dry + Acetaminophen, Chlorzoxazone, Codeine interactionAcetaminophen, CodeineTylenol No.3, Tylenol w/ Codeine
How Acetaminophen, Codeine interacts with Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DrySeizure Threshold Lowering Drugs Moderate
Interaction Summary
Thuja products can contains significant amounts of thujone, a neurotoxin.
Read the full Western Red Cedar Leaf Extract, Dry + Acetaminophen, Codeine interactionAcetaminophen, Codeine, DoxylamineMersyndol
How Acetaminophen, Codeine, Doxylamine interacts with Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DrySeizure Threshold Lowering Drugs Moderate
Interaction Summary
Thuja products can contains significant amounts of thujone, a neurotoxin.
Read the full Western Red Cedar Leaf Extract, Dry + Acetaminophen, Codeine, Doxylamine interactionAcetaminophen, Codeine, MethocarbamolAcetaminophen, Codeine, Methocarbamol, Robaxacet 8
How Acetaminophen, Codeine, Methocarbamol interacts with Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DrySeizure Threshold Lowering Drugs Moderate
Interaction Summary
Thuja products can contains significant amounts of thujone, a neurotoxin.
Read the full Western Red Cedar Leaf Extract, Dry + Acetaminophen, Codeine, Methocarbamol interactionAcetaminophen, Dexbrompheniramine, PseudoephedrineSinadrin Plus
How Acetaminophen, Dexbrompheniramine, Pseudoephedrine interacts with Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DrySeizure Threshold Lowering Drugs Moderate
Interaction Summary
Thuja products can contains significant amounts of thujone, a neurotoxin.
Read the full Western Red Cedar Leaf Extract, Dry + Acetaminophen, Dexbrompheniramine, Pseudoephedrine interactionAcetaminophen, Dextromethorphan, Doxylamine, PseudoephedrineVicks NyQuil
How Acetaminophen, Dextromethorphan, Doxylamine, Pseudoephedrine interacts with Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DrySeizure Threshold Lowering Drugs Moderate
Interaction Summary
Thuja products can contains significant amounts of thujone, a neurotoxin.
Read the full Western Red Cedar Leaf Extract, Dry + Acetaminophen, Dextromethorphan, Doxylamine, Pseudoephedrine interactionAcetaminophen, DiphenhydramineTylenol PM, Tylenol PM Ex Strength
How Acetaminophen, Diphenhydramine interacts with Western Red Cedar — through 1 ingredient. Tap an ingredient for the detail:
Western Red Cedar Leaf Extract, DrySeizure Threshold Lowering Drugs Moderate
Interaction Summary
Thuja products can contains significant amounts of thujone, a neurotoxin.
Read the full Western Red Cedar Leaf Extract, Dry + Acetaminophen, Diphenhydramine interactionEach ingredient & the kinds of drugs it affects
For each ingredient in Western Red Cedar 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.
Western Red Cedar Leaf Extract, Dry
Anticonvulsants
Thuja products can contain thujone, which might lower the seizure threshold. Theoretically, this could decrease the effectiveness of anticonvulsants drugs.
Immunosuppressants
Thuja might stimulate immune function. Theoretically, taking thuja might decrease the effects of immunosuppressive therapy. Immunosuppressant drugs include azathioprine (Imuran), basiliximab (Simulect), cyclosporine (Neoral, Sandimmune), daclizumab (Zenapax), muromonab-CD3 (OKT3, Orthoclone OKT3), mycophenolate (CellCept), tacrolimus (FK506, Prograf), sirolimus (Rapamune), prednisone (Deltasone, Orasone), and other corticosteroids (glucocorticoids).
Seizure Threshold Lowering Drugs
Thuja products can contains significant amounts of thujone, a neurotoxin. Theoretically, patients taking drugs that lower the seizure threshold might be at greater risk of seizure if they also take thuja. Advise patients taking these drugs to avoid thuja products. Some drugs that lower the seizure threshold include anesthetics (propofol, others), antiarrhythmics (mexiletine), antibiotics (amphotericin, penicillin, cephalosporins, imipenem), antidepressants (bupropion, others), antihistamines (cyproheptadine, others), immunosuppressants (cyclosporine), narcotics (fentanyl, others), stimulants (methylphenidate), theophylline, and others.
Brand information
Manufacturer and brand details for Western Red Cedar, from the product label.
Hawaii Pharm
See all Hawaii Pharm products- Name
- Hawaii Pharm LLC
- Street Address
- 510 Sumner St STE 613
- City
- Honolulu
- State
- HI
- ZipCode
- 96817
- Phone Number
- 888-542-9244
- Web Address
- Hawaiipharm.com
Western Red Cedar by Hawaii Pharm: Common Questions
Does Western Red Cedar by Hawaii Pharm interact with any medications?
How can one product interact with so many drugs?
Where does this information come from?
Can I take this if I'm pregnant or breastfeeding?
What are the side effects of thuja?
Does Western Red Cedar work for the common cold?
What is thujone and why is it a concern?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
Not sure if Western Red Cedar is safe with your meds?
Our pharmacists answer your medication & supplement questions — free.
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.
The Full Monographs Behind Western Red Cedar’s Ingredients
Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.
Sources & How We Checked
Western Red Cedar'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 10 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.
Thuja 10 references
- Leung AY, Foster S. Encyclopedia of Common Natural Ingredients Used in Food, Drugs and Cosmetics. 2nd ed. New York, NY: John Wiley & Sons, 1996.
- McGuffin M, Hobbs C, Upton R, Goldberg A, eds. American Herbal Products Association's Botanical Safety Handbook. Boca Raton, FL: CRC Press, LLC 1997.
- Millet Y, Jouglard J, Steinmetz MD, et al. Toxicity of some essential plant oils. Clinical and experimental study. Clin Toxicol 1981;18:1485-98. PubMed
- Gohla SH, Haubeck HD, Neth RD. Mitogenic activity of high molecular polysaccharide fractions isolated from the Cupressaceae Thuja occidentale L. I. Macrophage-dependent induction of CD-4-positive T-helper (Th+) lymphocytes. Leukemia 1988;2:528-33.
- Fetrow CW, Avila JR. Professional's Handbook of Complementary & Alternative Medicines. 1st ed. Springhouse, PA: Springhouse Corp., 1999.
- Henneicke-von Zepelin H, Hentschel C, Schnitker J, et al. Efficacy and safety of a fixed combination phytomedicine in the treatment of the common cold (acute viral respiratory tract infection): results of a randomised, double blind, placebo-controlled, m
- Naser, B., Bodinet, C., Tegtmeier, M., and Lindequist, U. Thuja occidentalis (Arbor vitae): A Review of its Pharmaceutical, Pharmacological and Clinical Properties. Evid.Based Complement Alternat.Med 2005;2(1):69-78.
- Patel R, Alavi F, Ortega S, Matela A. Herb-Induced Liver Injury by Cimicifuga racemosa and Thuja occidentalis Herbal Medications for Fertility. Case Rep Gastrointest Med 2021;2021:8858310. PubMed
- Ambooken B, Thomas M, Jisha KT. Papillary Eccrine Adenoma in a 5-year-old Girl Altered by Application of Thuja Ointment. J Cutan Aesthet Surg 2020;13(4):370-371. PubMed
- Badaoui A, Fougerousse AC. Contact dermatitis to linalool and limonene: Unusual sources of exposure. Ann Dermatol Venereol 2023;150(2):167-168. PubMed
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