Drug & supplement interaction

Quillaia + Reslizumab

Reslizumab brand name: Cinqair.

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 Quillaia and Reslizumab 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.

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Interaction report

Quillaia and Reslizumab

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 Reslizumab and Quillaia 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.

Quillaia safety at a glance

Quillaia overall Use caution Generally recognized as safe in the small amounts used in foods, but larger or concentrated doses may be harmful.
Pregnancy Possibly Unsafe When used in medicinal amounts; avoid using. Read the full pregnancy detail
Breastfeeding Possibly Unsafe When used in medicinal amounts; 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 Reslizumab and Quillaia? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
Keep it in perspective

Quillaia Does Interact With Other Medications

Quillaia has 121 moderate known drug interactions in our database — Reslizumab isn’t one of them. If you take anything else, check it against the full list below.

Moderate 121 No known interaction 2,709 (incl. Reslizumab)
Taking anything else?

Check Another of Your Medications Against Quillaia

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

What to actually watch for

What Quillaia Itself Has Been Linked To

This is not an interaction — nothing below involves Reslizumab. It is the side-effect record for Quillaia on its own, from the licensed Natural Medicines monograph. If something new turns up after you add Quillaia, this list is the first place to look. 2 entries are worth acting on rather than waiting out — marked below.

  • Seizures Worth acting on Additional detail

    “Orally, quillaia seems to be well tolerated when consumed in foods; however, it is associated with significant adverse effects at higher doses due to its oxalate and tannin content. A thorough evaluation of safety outcomes has not been conducted.

    Serious Adverse Effects (Rare):

    Orally: Coma, convulsions, diarrhea, gastrointestinal tract mucosal damage, hemolysis, and kidney failure.”

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

  • Kidney problems Worth acting on Additional detail

    “Orally, quillaia combines with calcium to form crystals of calcium oxalate which can precipitate in the renal tubules and cause acute kidney failure (12).”

    Quillaia · Natural Medicines adverse-effect record, reported in kidney failure.

    1 source cited
    1. 12. McGuffin M, Hobbs C, Upton R, Goldberg A, eds. American Herbal Products Association's Botanical Safety Handbook. Boca Raton, FL: CRC Press, LLC 1997.
  • Stomach upset / Stomach pain Additional detail

    “Orally, large amounts of quillaia are associated with diarrhea, stomach pain, and other gastrointestinal disturbances. Quillaia powder can be caustic to esophageal and gastrointestinal mucosae (12).”

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

    1 source cited
    1. 12. McGuffin M, Hobbs C, Upton R, Goldberg A, eds. American Herbal Products Association's Botanical Safety Handbook. Boca Raton, FL: CRC Press, LLC 1997.
  • Diarrhea Additional detail

    Recorded for Quillaia in the same Natural Medicines adverse-effect record shown under Seizures above.

Everything above comes from the Natural Medicines adverse-effect record for Quillaia — expand a row for the licensed statement it rests on. We read the ADVERSE REACTIONS section of Reslizumab’s FDA label too, and the two lists don’t meaningfully overlap — which is why no Reslizumab column appears here.

Special populations

Quillaia in Pregnancy & Breastfeeding

Pregnancy And Lactation Possibly Unsafe

When used in medicinal amounts; 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

Overlapping uses

What Reslizumab Is Prescribed For, and What Quillaia Has Been Studied For

These two come up together because they touch the same health topic — not because they do the same job. Reslizumab is a prescription medicine with approved uses on its FDA label. Quillaia is a supplement: what follows is what researchers have looked at it for, and how strong that evidence is.

Reslizumab is prescribed for: Cinqair (reslizumab) injection is indicated for adults 18 years and older with severe asthma that is driven by high eosinophil levels (a type of white blood cell involved in allergic inflammation). It is used as an add-on treatment, meaning it works alongside other asthma medicines the patient is already taking. Cinqair is not meant to treat sudden asthma attacks or to relieve symptoms in the moment. It is also not approved for other conditions caused by high eosinophil levels, and it is not approved for anyone under 18.

Quillaia has been studied for:

  • Asthma studied, not established Quillaia has been studied for this. Natural Medicines rates the evidence: Insufficient Reliable Evidence To Rate Read what the research shows

    Quillaia for asthma

    Although there is interest in using oral quillaia for asthma, there is insufficient reliable information about the clinical effects of quillaia for this condition.

Effectiveness ratings and the research summaries above are the verbatim record from the Natural Medicines database, which grades evidence from “Effective” down to “Insufficient Reliable Evidence To Rate”. A rating below the top of that scale means researchers have looked at it — not that it works, and never that it can stand in for a prescribed medicine. Do not stop or replace Reslizumab on your own; if you are taking Quillaia for the same health topic, tell your prescriber, especially if the medicine is being adjusted to a target.

How much people look this up

Where Quillaia and Reslizumab 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 Quillaia
Top half

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

29 days ago today
Medication Reslizumab
Top 25%

#529 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 Quillaia reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Quillaia and Reslizumab 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 Quillaia

What is Quillaia?

  • Cough and chest congestion
  • Foaming agent in beverages
  • Vaccine adjuvant (in pharmaceutical manufacturing)
  • Washing and cleansing (traditional soap)
  • Skin conditions

Quillaia (soap bark tree) is a plant whose bark contains foaming compounds called saponins, and it is widely used as an emulsifier in foods and drinks. As a supplement or herbal remedy its benefits are not well proven, and large amounts can be irritating or toxic, so it should be used cautiously and only as directed.

Quillaja saponaria · Quillajaceae · Inner bark · Liquid extract, powder, food and beverage additive, tinctures

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

Quillaia: dosing

There is no well-established standardized supplement dose for quillaia. The amounts used as a food and beverage additive are tightly limited by safety regulations.If you choose to use a quillaia product, follow the directions on the label and do not exceed the recommended amount.

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

Read the full Quillaia monograph & all interactions
Medication

About Reslizumab Injection

What Is Reslizumab Injection Used For?

Brand name: Cinqair

Cinqair (reslizumab) injection is indicated for adults 18 years and older with severe asthma that is driven by high eosinophil levels (a type of white blood cell involved in allergic inflammation). It is used as an add-on treatment, meaning it works alongside other asthma medicines the patient is already taking.

Cinqair is not meant to treat sudden asthma attacks or to relieve symptoms in the moment. It is also not approved for other conditions caused by high eosinophil levels, and it is not approved for anyone under 18.

See full Reslizumab Injection drug information
Keep checking

Other Drugs & Quillaia

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

0Major
121Moderate
0Minor
2,708No known interaction
121 Moderate 2,708 No interaction
Moderate

121 interactions

Showing 60 of 121 moderate interactions — see all 121 on the Quillaia page.

No interaction 2,708 drugs checked — show the list

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

Showing the 60 most looked-up of 2,708 medications checked with no known interaction — see the full Quillaia list.

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

Quillaia References

The 5 references that drive our Quillaia 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. The Review of Natural Products by Facts and Comparisons. St. Louis, MO: Wolters Kluwer Co., 1999.
  2. Leung AY, Foster S. Encyclopedia of Common Natural Ingredients Used in Food, Drugs and Cosmetics. 2nd ed. New York, NY: John Wiley & Sons, 1996.
  3. McGuffin M, Hobbs C, Upton R, Goldberg A, eds. American Herbal Products Association's Botanical Safety Handbook. Boca Raton, FL: CRC Press, LLC 1997.
  4. Wu JY, Gardner BH, Murphy CI, et al. Saponin adjuvant enhancement of antigen-specific immune responses to an experimental HIV-1 vaccine. J Immunol 1992;148:1519-25. DOI
  5. Fleck JD, Betti AH, da Silva FP, et al. Saponins from Quillaja saponaria and Quillaja brasiliensis: particular chemical characteristics and biological activities. Molecules 2019;24(1). pii: E171. 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 Quillaia and Reslizumab Together: Common Questions

Is it safe to take Quillaia with Reslizumab?
We do not list a known interaction between Quillaia and Reslizumab. 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.
Are Quillaia and Reslizumab used for the same thing?
They overlap in purpose, which usually means the real question is whether you need both rather than whether they are safe together. This page lists the shared uses and how strong the evidence is for Quillaia in each. That is a conversation for your prescriber, especially if Reslizumab is being adjusted to a target.
Does Quillaia interact with any other medications?
Yes. Quillaia has 121 documented drug interactions in our database — Reslizumab 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

Quillaia monograph Uses, safety profile, and every drug interaction in one place Reslizumab Injection drug information The full plain-English guide to this medication Reslizumab supplement interactions Every supplement checked against Reslizumab, 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 5 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Reslizumab and Quillaia?

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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.