Drug & supplement interaction

Thuja + Lanadelumab (Shp643)

Lanadelumab (Shp643) brand name: Takhzyro.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Sep 13, 2026
The bottom line No known interaction

We found no known interaction between Thuja and Lanadelumab (Shp643) in our sources. Absence of a documented interaction is not the same as proven safety, and does not guarantee one does not exist. Do not start, stop, or change a medication or supplement based on this page; confirm with your pharmacist or doctor first. Additionally, although there is no interaction, the two are separately associated with some of the same side effects, which would make a new symptom harder to attribute to one or the other.

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Interaction report

Thuja and Lanadelumab (Shp643)

We checked these two against our interaction database. Here is what we found.

No Known Interaction Found

We did not find a documented interaction between Lanadelumab (Shp643) and Thuja in our sources. This does not guarantee that the combination is completely free of risk — there is often limited research on supplements and herbal products, especially around drug interactions.

If you decide to take both, the practical routine is simple: add one new thing at a time and note the date you started it. If the combination is going to disagree with you, it usually shows in the first days to a couple of weeks — and a start date turns “I’ve been feeling off” into something a pharmacist can actually work with. Do not stop a prescribed medicine on your own.

Always talk with your pharmacist or doctor before making changes to your medications or supplements, particularly if you take several medications or have an ongoing health condition.

Thuja safety at a glance

Thuja overall Use caution The plant and especially its essential oil contain thujone, which can be toxic if taken internally in large amounts.
Pregnancy Likely Unsafe When used orally due to abortifacient activity; avoid using. Read the full pregnancy detail
Breastfeeding Likely Unsafe When used orally due to toxicity; avoid using. Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center) — the full detail is in the Special populations card below. Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Lanadelumab (Shp643) and Thuja? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
Keep it in perspective

Thuja Does Interact With Other Medications

Thuja has 576 moderate known drug interactions in our database — Lanadelumab (Shp643) isn’t one of them. If you take anything else, check it against the full list below.

Moderate 576 No known interaction 2,254 (incl. Lanadelumab (Shp643))
Taking anything else?

Check Another of Your Medications Against Thuja

Covers the 2,830 medications we’ve checked against Thuja. Pick one to open its full report.

What to actually watch for

No Interaction Found — But Data Suggests Thuja and Lanadelumab (Shp643) May Share Several of the Same Side Effects

This is not an interaction. Neither one changes how your body handles the other, and nothing here says they react together. What our sources do show is that each has separately been linked to the effects below — so taking both can make those effects more likely to turn up, and harder to pin on one or the other if they do.

  • Diarrhea Additional detail

    Thuja

    “Orally, large doses of thuja have been reported to cause toxicity involving headache, nervous agitation, seizures, gastric irritation, vomiting, abdominal pain, and diarrhea. Thuja toxicity has also been reported to cause liver damage, renal toxicity, and death in some cases.”

    Thuja · Natural Medicines adverse-effect record, reported in cluster headache.

    2 sources cited
    1. 6002. Fetrow CW, Avila JR. Professional's Handbook of Complementary & Alternative Medicines. 1st ed. Springhouse, PA: Springhouse Corp., 1999.
    2. 40888. 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.

    “Orally, large doses of thuja have been reported to cause toxicity involving gastric irritation, vomiting, abdominal pain, and diarrhea.”

    Thuja · Natural Medicines adverse-effect record, reported in diarrhea.

    2 sources cited
    1. 6002. Fetrow CW, Avila JR. Professional's Handbook of Complementary & Alternative Medicines. 1st ed. Springhouse, PA: Springhouse Corp., 1999.
    2. 40888. 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.

    Lanadelumab (Shp643)

    Listed in the ADVERSE REACTIONS section of the FDA label for Lanadelumab (Shp643). Read the label on DailyMed ›

  • A skin rash Additional detail

    Thuja

    “Contact dermatitis, presenting as an itchy papular squamous eruption on the hands, developed in a 46-year-old female who handled thuja plants while gardening. It resolved when contact with thuja was avoided. The causative ingredient of thuja was identified as limonene.

    In one case report, a 5-year-old female presented with a papillary eccrine adenoma.”

    Thuja · Natural Medicines adverse-effect record, reported in dermatitis.

    2 sources cited
    1. 113415. Badaoui A, Fougerousse AC. Contact dermatitis to linalool and limonene: Unusual sources of exposure. Ann Dermatol Venereol 2023;150(2):167-168. PubMed
    2. 106048. 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

    Lanadelumab (Shp643)

    Listed in the ADVERSE REACTIONS section of the FDA label for Lanadelumab (Shp643). Read the label on DailyMed ›

  • Headache Additional detail

    Thuja

    Recorded for Thuja in the same Natural Medicines adverse-effect record shown under Diarrhea above.

    Lanadelumab (Shp643)

    Listed in the ADVERSE REACTIONS section of the FDA label for Lanadelumab (Shp643). Read the label on DailyMed ›

Reported for Thuja but not commonly for Lanadelumab (Shp643): stomach upset, stomach pain, kidney problems and liver problems.

Effects for Lanadelumab (Shp643) come from the ADVERSE REACTIONS section of its FDA label; effects for Thuja come from the Natural Medicines adverse-effect record, quoted above. Wording is matched across sources by our own clinical vocabulary, so treat this as a prompt to pay attention, not a diagnosis.

Special populations

Thuja in Pregnancy & Breastfeeding

Pregnancy Likely Unsafe

When used orally due to abortifacient activity; avoid using.

Lactation Likely Unsafe

When used orally due to toxicity; avoid using.

DISCLAIMER: This tool is intended for informational purposes only, and should not be interpreted as specific medical advice. Patients should consult with a qualified healthcare provider before making decisions about therapies and/or health conditions.© 2026 Therapeutic Research Center

One more smart check

Taking Thuja as Part of a Dietary Supplement Product? Check It for Interactions

We hold 84 real supplement products containing Thuja, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Thuja. Even though Thuja itself has no known interaction with Lanadelumab (Shp643), another ingredient on your label might. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Thuja and Lanadelumab (Shp643) Sit Against Everything Else

Out of every supplement and medication people look up on HelloPharmacist, here is where these two land this week — and which way each has been moving.

Supplement Thuja
Top half

#490 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Lanadelumab (Shp643)
Top 25%

#328 of 2,830 medications looked up here in the last 7 days

29 days ago today

Position among everything looked up on this site, not a measure of how commonly either one is used or how important it is. A supplement can climb this list because of a news story. It counts every request to the page, automated ones included, and nothing here identifies anyone.

Where does our data come from?
  • Source: the Natural Medicines (TRC Healthcare) clinical database — the evidence-graded professional reference for herb & supplement interactions.
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Thuja reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Thuja and Lanadelumab (Shp643) records this page draws on were last updated July 11, 2026.
  • What “no known interaction” means: no documented interaction in the sources above — not a guarantee of safety. Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more.
Data structure & sourcing designed and verified by .
Supplement

About Thuja

What is Thuja?

  • Warts and skin growths
  • Respiratory and immune support
  • Cold and upper respiratory symptoms
  • Topical skin conditions
  • Traditional use as a diuretic or to bring on menstruation

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 for warts and immune support. Solid human evidence for these uses is very limited, and the undiluted oil contains thujone, which can be toxic. Talk with a pharmacist or doctor before using it, and avoid it during pregnancy and breastfeeding.

Thuja occidentalis · Cupressaceae · Leaves (young twigs/branch tips) and essential oil · Homeopathic pellets, tinctures, topical ointments, essential oil, capsules, and combination cold/immune products

An interaction check asks whether these two react with each other — it does not ask whether Thuja is a good idea for someone in your situation. Here is what our Thuja record says about it on its own.

Thuja: dosing

There is no well-established standard dose for thuja, and products vary widely in strength. Homeopathic pellets, tinctures, and topical creams all use different concentrations.Because the essential oil contains potentially toxic thujone, it should not be taken by mouth without professional guidance.

From our Thuja monograph — the full record covers uses, side effects and every documented interaction.

Read the full Thuja monograph & all interactions
Medication

About Lanadelumab-flyo injection

What Is Lanadelumab-flyo injection Used For?

Brand name: Takhzyro

Takhzyro (lanadelumab-flyo) is used to prevent attacks of hereditary angioedema (HAE) — a condition that causes sudden, painful episodes of swelling in areas like the skin, abdomen, hands, feet, and throat. It is approved for adults and children 2 years of age and older.

Takhzyro is a preventive (prophylactic) therapy. It is not used to treat an attack that is already happening — it works in the background to reduce how often attacks occur.

See full Lanadelumab-flyo injection drug information
Keep checking

Other Drugs & Thuja

Browse every other medication we’ve checked against Thuja — both the ones with a known interaction and the ones without. Select any drug for the full detail.

0Major
576Moderate
0Minor
2,253No known interaction
576 Moderate 2,253 No interaction
Moderate

576 interactions

Showing 60 of 576 moderate interactions — see all 576 on the Thuja page.

No interaction 2,253 drugs checked — show the list

We also checked Thuja against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 2,253 medications checked with no known interaction — see the full Thuja list.

See the full Thuja interactions page
See every supplement checked against Lanadelumab (Shp643), ranked by severity
Evidence & sources

Thuja References

The 10 references that drive our Thuja monograph and interaction data, from the evidence-graded Natural Medicines (TRC Healthcare) database. Citations with a link open the study on PubMed or the publisher’s site.

  1. Leung AY, Foster S. Encyclopedia of Common Natural Ingredients Used in Food, Drugs and Cosmetics. 2nd ed. New York, NY: John Wiley & Sons, 1996.
  2. McGuffin M, Hobbs C, Upton R, Goldberg A, eds. American Herbal Products Association's Botanical Safety Handbook. Boca Raton, FL: CRC Press, LLC 1997.
  3. 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
  4. 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.
  5. Fetrow CW, Avila JR. Professional's Handbook of Complementary & Alternative Medicines. 1st ed. Springhouse, PA: Springhouse Corp., 1999.
  6. 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
  7. 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.
  8. 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
  9. 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
  10. Badaoui A, Fougerousse AC. Contact dermatitis to linalool and limonene: Unusual sources of exposure. Ann Dermatol Venereol 2023;150(2):167-168. PubMed

Medication overviews come from MedlinePlus (NIH); supplement label data from the NIH Dietary Supplement Label Database. Content is written and reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

Pharmacist Counseling Corner

Taking Thuja and Lanadelumab (Shp643) Together: Common Questions

Is it safe to take Thuja with Lanadelumab (Shp643)?
We do not list a known interaction between Thuja and Lanadelumab (Shp643). That does not guarantee the combination is risk-free, so confirm with your pharmacist or doctor — especially if you take other medications or have a health condition.
Do Thuja and Lanadelumab (Shp643) have any of the same side effects?
Yes — our sources link each of them separately to 3 of the same effects. That is not an interaction: neither changes how your body handles the other. It does mean that if one of those effects turns up, it can be harder to tell which one is behind it. They are listed on this page with the source behind each.
Does Thuja interact with any other medications?
Yes. Thuja has 576 documented drug interactions in our database — Lanadelumab (Shp643) is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.

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

Where next

Keep Exploring

Thuja monograph Uses, safety profile, and every drug interaction in one place Lanadelumab-flyo injection drug information The full plain-English guide to this medication Lanadelumab (Shp643) supplement interactions Every supplement checked against Lanadelumab (Shp643), ranked by severity Supplement interaction checker Check any supplement or product against your medications Browse medications A–Z Every drug we’ve checked against herbs & supplements References The 10 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

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This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.