Drug & supplement interaction

Slippery Elm + Peginterferon alfa-2b

Peginterferon alfa-2b brand names: Peg-Intron, ViraferonPeg.

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 Slippery Elm and Peginterferon alfa-2b 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

Slippery Elm and Peginterferon alfa-2b

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 Peginterferon alfa-2b and Slippery Elm 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.

Slippery Elm safety at a glance

Slippery Elm overall Use caution Generally well tolerated for short-term use, but high-quality safety data are limited.
Pregnancy Use caution Not enough reliable safety data; some sources caution against using it during pregnancy.
Breastfeeding Use caution There is too little information on safety while breastfeeding, so caution is advised.

Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Peginterferon alfa-2b and Slippery Elm? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Peginterferon alfa-2b

Interactions in our licensed database are recorded against drug classes, not just single drug names. Peginterferon alfa-2b is filed under a single classification — hepatotoxic drugs. Slippery Elm has documented interactions with 1 drug class — the most serious being oral drugs (moderate) — and none of Peginterferon alfa-2b’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

Slippery Elm Does Interact With Other Medications

Slippery Elm has 2,022 moderate known drug interactions in our database — Peginterferon alfa-2b isn’t one of them. If you take anything else, check it against the full list below.

Moderate 2,022 No known interaction 808 (incl. Peginterferon alfa-2b)
Taking anything else?

Check Another of Your Medications Against Slippery Elm

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

What to actually watch for

What Slippery Elm Itself Has Been Linked To

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

  • Hives Worth acting on Additional detail

    “Topically, slippery elm extracts can cause contact dermatitis. The pollen is an allergen (6). Contact dermatitis and urticaria have been reported after exposure to slippery elm or an oleoresin contained in the slippery elm bark.”

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

    2 sources cited
    1. 6. The Review of Natural Products by Facts and Comparisons. St. Louis, MO: Wolters Kluwer Co., 1999.
    2. 75131. Czarnecki D, Nixon R, Bekhor P, and et al. Delayed prolonged contact urticaria from the elm tree. Contact Dermatitis 1993;28:196-197. PubMed
  • A skin rash Additional detail

    Recorded for Slippery Elm in the same Natural Medicines adverse-effect record shown under Hives above.

Everything above comes from the Natural Medicines adverse-effect record for Slippery Elm — expand a row for the licensed statement it rests on. We haven’t matched Peginterferon alfa-2b to its FDA label in our system yet, so we can’t compare its own side-effect list here — the leaflet that comes with your prescription is the authoritative list for Peginterferon alfa-2b.

Overlapping uses

What Peginterferon alfa-2b Is Prescribed For, and What Slippery Elm Has Been Studied For

These two come up together because they touch the same health topic — not because they do the same job. Peginterferon alfa-2b is a prescription medicine with approved uses on its FDA label. Slippery Elm is a supplement: what follows is what researchers have looked at it for, and how strong that evidence is.

Slippery Elm has been studied for:

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

    Slippery Elm for cancer

    Oral slippery elm has only been evaluated in combination with other ingredients; its effect when used alone is unclear.

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 Peginterferon alfa-2b on your own; if you are taking Slippery Elm for the same health topic, tell your prescriber, especially if the medicine is being adjusted to a target.

From our Q&A

Questions About Slippery Elm or Peginterferon alfa-2b

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Slippery Elm or Peginterferon alfa-2b, not necessarily both, but if one is close to what you were about to ask it will usually go further than a database entry can:

Not quite your question? Ask our pharmacists directly — it is free, there is no account required, and answers usually come back within 24 hours.

Everything else you take

See Every Supplement That Interacts With Peginterferon alfa-2b

This page covers Slippery Elm only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Peginterferon alfa-2b page lists 38 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Beer (major), Siberian Cocklebur (major), Wine (major), Ashwagandha (moderate) and Black Cohosh (moderate).

By severity: 3 major · 35 moderate.

From our pharmacist’s overview on the Peginterferon alfa-2b page

“Someone taking peginterferon alfa-2b (Peg-Intron) is usually treating hepatitis C, so the liver is already the organ under strain, and all 38 supplement interactions on file for this drug pile additional liver stress on top of it. That earns genuine caution.”

Reviewed by 2 · Jul 18, 2026

Open the Peginterferon alfa-2b interaction page

One more smart check

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

We hold 1,490 real supplement products containing Slippery Elm, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Slippery Elm. Even though Slippery Elm itself has no known interaction with Peginterferon alfa-2b, 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 Slippery Elm and Peginterferon alfa-2b 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 Slippery Elm
Top 10%

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

29 days ago today
Medication Peginterferon alfa-2b
Steady interest

#2,078 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 Slippery Elm reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Slippery Elm and Peginterferon alfa-2b 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 Slippery Elm

What is Slippery Elm?

Slippery Elm
  • Sore throat and cough
  • Heartburn and acid reflux
  • Digestive upset and IBS
  • Skin irritation (topical)
  • Constipation or diarrhea

Slippery elm is a traditional herbal remedy made from the inner bark of a North American elm tree, used mainly to soothe sore throats and irritated digestive tracts. Its mucilage can coat and calm mucous membranes, but solid human evidence for most uses is limited. It is generally considered low-risk for short-term use, but you should still check with your pharmacist or doctor first.

Ulmus rubra · Ulmaceae · Inner bark · Capsules, tablets, lozenges, powder, tea, throat lozenges, topical pastes

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

Slippery Elm: dosing

There is no official standardized dose for slippery elm. The right amount can vary depending on the form (lozenge, capsule, powder, or tea) and the product.The safest approach is to follow the directions on the product label. When using the powder or capsules, take them with a full glass of water.

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

Read the full Slippery Elm monograph & all interactions
Medication

About Peginterferon Alfa-2b (PEG-Intron)

What Is Peginterferon Alfa-2b (PEG-Intron) Used For?

Brand names: Peg-Intron, ViraferonPeg

  • Peginterferon alfa-2b is used alone or in combination with ribavirin (a medication) to treat chronic (long-term) hepatitis C infection (swelling of the liver caused by a virus) in people who show signs of liver damage and who have not been treated with interferon alpha (medication similar to peginterferon alfa-2b) in the past. Peginterferon alfa-2b is in a class of medications called interferons. Peginterferon alfa-2b is a combination of interferon and polyethylene glycol, which helps the interferon stay active in your body for a longer period of time. Peginterferon alpha-2b works by decreasing the amount of hepatitis C virus (HCV) in the body. Peginterferon alfa-2b may not cure hepatitis C or prevent you from developing complications of hepatitis C such as cirrhosis (scarring) of the liver, liver failure, or liver cancer. Peginterferon alfa-2b may not prevent the spread of hepatitis C to other people.

See full Peginterferon Alfa-2b (PEG-Intron) drug information
Keep checking

Other Drugs & Slippery Elm

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

0Major
2,022Moderate
0Minor
807No known interaction
2,022 Moderate 807 No interaction
Moderate

2,022 interactions

Showing 60 of 2,022 moderate interactions — see all 2,022 on the Slippery Elm page.

No interaction 807 drugs checked — show the list

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

Showing the 60 most looked-up of 807 medications checked with no known interaction — see the full Slippery Elm list.

See the full Slippery Elm interactions page
See every supplement checked against Peginterferon alfa-2b, ranked by severity
Evidence & sources

Slippery Elm References

The 3 references that drive our Slippery Elm 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. Brinker F. Herb Contraindications and Drug Interactions. 2nd ed. Sandy, OR: Eclectic Medical Publications, 1998.
  3. Czarnecki D, Nixon R, Bekhor P, and et al. Delayed prolonged contact urticaria from the elm tree. Contact Dermatitis 1993;28:196-197. 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 Slippery Elm and Peginterferon alfa-2b Together: Common Questions

Is it safe to take Slippery Elm with Peginterferon alfa-2b?
We do not list a known interaction between Slippery Elm and Peginterferon alfa-2b. 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 Slippery Elm and Peginterferon alfa-2b 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 Slippery Elm in each. That is a conversation for your prescriber, especially if Peginterferon alfa-2b is being adjusted to a target.
How was the Slippery Elm and Peginterferon alfa-2b combination checked?
Interactions in our licensed database are recorded against drug classes. Peginterferon alfa-2b is filed under 1 classification, and Slippery Elm has documented interactions with 1 drug class — none of Peginterferon alfa-2b'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 Slippery Elm interact with any other medications?
Yes. Slippery Elm has 2,022 documented drug interactions in our database — Peginterferon alfa-2b 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 Peginterferon alfa-2b interact with any supplements?
Yes. Peginterferon alfa-2b has documented interactions with 38 supplements in our database — Slippery Elm is not one of them. The Peginterferon alfa-2b 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

Slippery Elm monograph Uses, safety profile, and every drug interaction in one place Peginterferon Alfa-2b (PEG-Intron) drug information The full plain-English guide to this medication Peginterferon alfa-2b supplement interactions Every supplement checked against Peginterferon alfa-2b, 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 3 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Peginterferon alfa-2b and Slippery Elm?

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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.