Drug & supplement interaction

American Spikenard + Zileuton

Zileuton brand names: Zyflo, Zyflo CR.

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 American Spikenard and Zileuton 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 label for Zileuton states a food rule worth keeping to.

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Interaction report

American Spikenard and Zileuton

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 Zileuton and American Spikenard 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.

American Spikenard safety at a glance

American Spikenard overall Use caution Little is known about its safety from modern studies, so use cautiously and short-term.
Pregnancy Possibly Unsafe When used orally; avoid using. Read the full pregnancy detail
Breastfeeding Avoid Avoid while breastfeeding due to a lack of safety information.

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 Zileuton and American Spikenard? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Zileuton

Interactions in our licensed database are recorded against drug classes, not just single drug names. Zileuton is filed under 8 classifications — including cytochrome p450 1a2 (cyp1a2) inhibitors, cytochrome p450 2c9 (cyp2c9) substrates, cytochrome p450 3a4 (cyp3a4) inhibitors. American Spikenard has documented interactions with 1 drug class — the most serious being diuretic drugs (minor) — and none of Zileuton’s classifications are among them.

Classification data comes from our licensed Natural Medicines dataset. A medication can belong to classes beyond those recorded there, so this describes how the check was run — it is not a safety guarantee.

Keep it in perspective

American Spikenard Does Interact With Other Medications

American Spikenard has 75 minor known drug interactions in our database — Zileuton isn’t one of them. If you take anything else, check it against the full list below.

Minor 75 No known interaction 2,755 (incl. Zileuton)
Taking anything else?

Check Another of Your Medications Against American Spikenard

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

What to actually watch for

What Zileuton’s Own FDA Label Lists

This is not an interaction — none of it involves American Spikenard. These are the most notable effects listed in the ADVERSE REACTIONS section of Zileuton’s own FDA label, for the medication by itself. Knowing the drug’s own list makes it easier to work out the likely cause if something new turns up while you take both. 3 of them are worth acting on rather than waiting out — marked below.

  • Wheezing Worth acting on mentioned in 11.9% of FDA reports for Zileuton
  • Liver problems Worth acting on
  • An allergic reaction Worth acting on
  • Stomach upset
  • Stomach pain
  • Nausea mentioned in 6.3% of FDA reports for Zileuton
  • Diarrhea
  • A skin rash
  • Vomiting

From the ADVERSE REACTIONS section of the FDA label for Zileuton. Read the label on DailyMed › Where a percentage is shown, it is the share of 637 voluntary FDA FAERS reports for Zileuton that mention that effect — a reporting proportion, not an incidence rate and not evidence the drug caused it. American Spikenard’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no American Spikenard side to compare — that is a limit of the record, not a statement that American Spikenard has no side effects.

Special populations

American Spikenard in Pregnancy & Breastfeeding

Pregnancy Possibly Unsafe

When used orally; 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

How to take them

Some Zileuton Products Have a Food Rule — American Spikenard Should Not Break It

At least one FDA label for a product containing Zileuton says to take it with food. If you take American Spikenard on an empty stomach out of habit, keep them separate — and take Zileuton with a meal where the label says to.

This may not be true of your version. Food instructions belong to the product, not the ingredient: two Zileuton products can carry different directions, and extended-release forms often differ from immediate-release ones. The label we read is quoted below — check the directions on your own box or bottle, or ask your pharmacist, for how to take the exact product you were given.

For ease of administration, ZYFLO may be taken with meals and at bedtime.

From the Dosage and Administration section of the FDA label we read for Zileuton — where that label names a specific product, the instruction is that product's. Read the label on DailyMed ›

A food rule is not an interaction — it is about how much of the medicine you absorb. The directions that came with your own product, and your pharmacist, outrank anything on this page.

Overlapping uses

What Zileuton Is Prescribed For, and What American Spikenard Has Been Studied For

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

Zileuton is prescribed for: Zileuton is used for the ongoing prevention and treatment of asthma in adults and adolescents aged 12 and older. It is a maintenance medicine — meaning it is taken regularly to keep asthma under control, not to stop an asthma attack once it has started. Zyflo (the tablet form) and zileuton extended-release tablets are both approved for this same purpose. Neither form should be used to treat a sudden asthma attack.

Read the rest of what Zileuton is prescribed for

However, both can be continued during a flare-up of asthma while you also use your rescue inhaler.

American Spikenard has been studied for:

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

    American Spikenard for asthma

    Although there has been interest in using oral American spikenard for asthma, there is insufficient reliable information about the clinical effects of American spikenard for this purpose.

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 Zileuton on your own; if you are taking American Spikenard for the same health topic, tell your prescriber, especially if the medicine is being adjusted to a target.

Everything else you take

See Every Supplement That Interacts With Zileuton

This page covers American Spikenard only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Zileuton page lists 213 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Beer (major), Grapefruit (major), Siberian Cocklebur (major) and St. John's Wort (major).

By severity: 6 major · 163 moderate · 44 minor.

Open the Zileuton interaction page

How much people look this up

Where American Spikenard and Zileuton 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 American Spikenard
Top half

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

29 days ago today
Medication Zileuton
Steady interest

#1,684 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 American Spikenard reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The American Spikenard and Zileuton 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 American Spikenard

What is American Spikenard?

American Spikenard
  • Cough and chest congestion
  • Common cold
  • Asthma symptoms
  • Promoting sweating
  • Skin and wound support (topical)

American spikenard is a traditional North American herb used mainly as an expectorant and to ease coughs and colds, but there is no reliable human research to confirm it works. If you choose to try it, use it short-term, follow the product label, and check with a pharmacist or doctor first—especially if you are pregnant, breastfeeding, or have a health condition.

Aralia racemosa · Araliaceae · Root and rhizome · Tea, tincture, dried root, capsules, syrup

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

American Spikenard: dosing

There is no established or standardized dose for American spikenard. Traditional preparations include teas made from the dried root, tinctures, and syrups, but reliable dosing guidelines based on research do not exist.If you choose to use it, follow the directions on the product label and do not exceed the recommended amount.

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

Read the full American Spikenard monograph & all interactions
Medication

About Zileuton

What Is Zileuton Used For?

Brand names: Zyflo, Zyflo CR

Zileuton is used for the ongoing prevention and treatment of asthma in adults and adolescents aged 12 and older. It is a maintenance medicine — meaning it is taken regularly to keep asthma under control, not to stop an asthma attack once it has started.

Zyflo (the tablet form) and zileuton extended-release tablets are both approved for this same purpose. Neither form should be used to treat a sudden asthma attack. However, both can be continued during a flare-up of asthma while you also use your rescue inhaler.

See full Zileuton drug information
Keep checking

Other Drugs & American Spikenard

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

0Major
0Moderate
75Minor
2,754No known interaction
75 Minor 2,754 No interaction
Minor

75 interactions

Showing 60 of 75 minor interactions — see all 75 on the American Spikenard page.

No interaction 2,754 drugs checked — show the list

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

Showing the 60 most looked-up of 2,754 medications checked with no known interaction — see the full American Spikenard list.

See the full American Spikenard interactions page
See every supplement checked against Zileuton, ranked by severity
Evidence & sources

American Spikenard References

The 1 references that drive our American Spikenard 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. McGuffin M, Hobbs C, Upton R, Goldberg A, eds. American Herbal Products Association's Botanical Safety Handbook. Boca Raton, FL: CRC Press, LLC 1997.

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 American Spikenard and Zileuton Together: Common Questions

Is it safe to take American Spikenard with Zileuton?
We do not list a known interaction between American Spikenard and Zileuton. 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.
Should I take American Spikenard and Zileuton at the same time of day?
At least one FDA label for a product containing Zileuton says to take it with food. If you take American Spikenard on an empty stomach out of habit, keep them separate and take Zileuton with a meal where the label says to. Food instructions belong to the product rather than the ingredient — two Zileuton products can differ — so check the directions on your own box. This is about absorption, not an interaction.
Are American Spikenard and Zileuton 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 American Spikenard in each. That is a conversation for your prescriber, especially if Zileuton is being adjusted to a target.
How was the American Spikenard and Zileuton combination checked?
Interactions in our licensed database are recorded against drug classes. Zileuton is filed under 8 classifications, and American Spikenard has documented interactions with 1 drug class — none of Zileuton's classifications are among them. A medication can belong to classes beyond those recorded in our dataset, so this describes how the check was run rather than guaranteeing safety.
Does American Spikenard interact with any other medications?
Yes. American Spikenard has 75 documented drug interactions in our database — Zileuton is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.
Does Zileuton interact with any supplements?
Yes. Zileuton has documented interactions with 213 supplements in our database — American Spikenard is not one of them. The Zileuton 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

American Spikenard monograph Uses, safety profile, and every drug interaction in one place Zileuton drug information The full plain-English guide to this medication Zileuton supplement interactions Every supplement checked against Zileuton, 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 1 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Zileuton and American Spikenard?

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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.