Drug & supplement interaction

Poinsettia + Omalizumab

Omalizumab brand name: Xolair.

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 Poinsettia and Omalizumab 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

Poinsettia and Omalizumab

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 Omalizumab and Poinsettia 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.

Worth understanding: our licensed dataset holds no drug-interaction record for Poinsettia at all — not against Omalizumab, and not against any other medication we track. This verdict therefore rests on the absence of any recorded data, not on research that looked at this combination and found nothing. We cannot rule an interaction out.

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.

Poinsettia safety at a glance

Poinsettia overall Use caution Not intended for internal use; the sap can irritate skin, eyes, and the digestive tract.
Pregnancy Possibly Unsafe When used orally or topically; avoid using. Read the full pregnancy detail
Breastfeeding Possibly Unsafe When used orally or topically; 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 Omalizumab and Poinsettia? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

No Interaction Found — But Data Suggests Poinsettia and Omalizumab May Share a Side Effect

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.

  • A skin rash Additional detail

    Poinsettia

    “Topically, poinsettia can cause local irritation, contact dermatitis, mucosal burns, and keratoconjunctivitis in some people (17, 3838,100568).”

    Poinsettia · Natural Medicines adverse-effect record, reported in burns.

    Omalizumab

    Listed in the ADVERSE REACTIONS section of the FDA label for Omalizumab. Read the label on DailyMed ›

Reported for Poinsettia but not commonly for Omalizumab: vomiting, diarrhea and nausea.

Effects for Omalizumab come from the ADVERSE REACTIONS section of its FDA label; effects for Poinsettia 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

Poinsettia in Pregnancy & Breastfeeding

Pregnancy And Lactation Possibly Unsafe

When used orally or topically; 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

Everything else you take

See Every Supplement That Interacts With Omalizumab

This page covers Poinsettia only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Omalizumab page lists 53 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Active Hexose Correlated Compound (ahcc) (moderate), Alfalfa (moderate), American Ginseng (moderate), Andrographis (moderate) and Ashwagandha (moderate).

By severity: 52 moderate · 1 minor.

From our pharmacist’s overview on the Omalizumab page

“None of the 53 supplements on file for omalizumab (Xolair) carries a major rating, so this is a list to read with steady attention rather than alarm. Xolair treats allergic asthma and chronic hives by calming part of the immune system, and every entry here pulls the other way: these are immune-stimulating products, echinacea and astrag…”

Reviewed by 2 · Jul 18, 2026

Open the Omalizumab interaction page

How much people look this up

Where Poinsettia and Omalizumab 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 Poinsettia
Steady interest

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

29 days ago today
Medication Omalizumab
Steady interest

#2,203 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 Poinsettia reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Poinsettia and Omalizumab records this page draws on were last updated July 10, 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 Poinsettia

What is Poinsettia?

  • Traditional folk skin remedies
  • Traditional use as a topical poultice
  • Folk use for fever
  • Decorative ornamental plant (most common use today)

Poinsettia is best known as a popular holiday ornamental plant, not a proven dietary supplement, and there is no reliable evidence that it works for any health condition. While its toxicity is often exaggerated, the plant and its milky sap can cause stomach upset and skin or eye irritation, so it is not recommended for medicinal use. If you are considering any herbal product, talk with your pharmacist or doctor first.

Euphorbia pulcherrima · Euphorbiaceae · Leaves, stems, and milky sap (latex); not a true medicinal supplement · Rarely used as a supplement; historically the plant parts and sap have been used in traditional folk preparations

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

Poinsettia: dosing

There is no established or recommended dose for poinsettia because it is not a recognized dietary supplement and is not intended for internal use. No standardized products exist, and safe amounts are unknown.Given the lack of evidence and the risk of irritation, poinsettia should not be taken as a remedy.

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

Read the full Poinsettia monograph & all interactions
Medication

About Omalizumab Injection

What Is Omalizumab Injection Used For?

Brand name: Xolair

Xolair is used for several allergy-driven conditions. It treats moderate to severe persistent asthma in adults and children 6 and older whose symptoms aren't controlled by inhaled corticosteroids alone and who test positive for a perennial allergen (like dust mites or pet dander). It also treats chronic rhinosinusitis with nasal polyps (ongoing sinus inflammation with polyp growth) in adults 18 and older when nasal corticosteroids haven't worked well enough.

Xolair is approved to help reduce allergic reactions — including anaphylaxis (severe, life-threatening allergic reactions) — from accidental food exposures in adults and children as young as 1 year old with IgE-mediated food allergy. It is always used alongside food allergen avoidance, not as a substitute. Finally, Xolair treats chronic spontaneous urticaria (CSU — ongoing hives with no known cause) in adults and adolescents 12 and older who still have symptoms despite taking antihistamines. It is not for emergency treatment of allergic reactions and not for other forms of hives.

See full Omalizumab Injection drug information
Keep checking

Other Drugs & Poinsettia

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

0Major
0Moderate
0Minor
2,829No known interaction
2,829 No interaction
No interaction 2,829 drugs checked — show the list

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

Showing the 60 most looked-up of 2,829 medications checked with no known interaction — see the full Poinsettia list.

See the full Poinsettia interactions page
See every supplement checked against Omalizumab, ranked by severity
Evidence & sources

Poinsettia References

The 4 references that drive our Poinsettia 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. Ellenhorn MJ, et al. Ellenhorn's Medical Toxicology: Diagnoses and Treatment of Human Poisoning. 2nd ed. Baltimore, MD: Williams & Wilkins, 1997.
  2. Krenzelok EP, Jacobsen TD, Aronis JM. Poinsettia exposures have good outcomes...just as we thought. Am J Emerg Med 1996;14:671-4. PubMed
  3. Petersen DD. Common plant toxicology: a comparison of national and southwest Ohio data trends on plant poisonings in the 21st century. Toxicol Appl Pharmacol. 2011;254(2):148-53. PubMed
  4. Evens ZN, Stellpflug SJ. Holiday plants with toxic misconceptions. West J Emerg Med. 2012;13(6):538-542. 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 Poinsettia and Omalizumab Together: Common Questions

Is it safe to take Poinsettia with Omalizumab?
We do not list a known interaction between Poinsettia and Omalizumab. 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 Poinsettia and Omalizumab have any of the same side effects?
Yes — our sources link each of them separately to one 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 Omalizumab interact with any supplements?
Yes. Omalizumab has documented interactions with 53 supplements in our database — Poinsettia is not one of them. The Omalizumab interaction page linked on this page lists every one, ranked by severity.

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

Where next

Keep Exploring

Poinsettia monograph Uses, safety profile, and every drug interaction in one place Omalizumab Injection drug information The full plain-English guide to this medication Omalizumab supplement interactions Every supplement checked against Omalizumab, 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 4 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Omalizumab and Poinsettia?

Our pharmacists answer your medication & supplement questions — free.

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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.