Drug & supplement interaction

Mountain Flax + Lisinopril

Lisinopril brand names: Zestril, Prinivil, Qbrelis.

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 Mountain Flax and Lisinopril 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

Mountain Flax and Lisinopril

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 Lisinopril and Mountain Flax 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 Mountain Flax at all — not against Lisinopril, 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.

Mountain Flax safety at a glance

Mountain Flax overall Use caution It is a strong traditional purgative with little safety data, and overuse can cause harsh gut effects.
Pregnancy Unsafe When used orally due to possible emetic effects. Read the full pregnancy detail
Breastfeeding Unsafe When used orally due to possible emetic effects. 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 Lisinopril and Mountain Flax? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

No Interaction Found — But Data Suggests Mountain Flax and Lisinopril 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 / Vomiting reported in 5.7% of FDA reports for Lisinopril Additional detail

    Mountain Flax

    “Orally, mountain flax can cause vomiting, gastrointestinal tract inflammation, and diarrhea (18).”

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

    1 source cited
    1. 18. Gruenwald J, Brendler T, Jaenicke C. PDR for Herbal Medicines. 1st ed. Montvale, NJ: Medical Economics Company, Inc., 1998.

    Lisinopril

    Listed in the ADVERSE REACTIONS section of the FDA label for Lisinopril, and in voluntary FDA adverse-event reports. Read the label on DailyMed ›

Effects for Lisinopril come from the ADVERSE REACTIONS section of its FDA label; effects for Mountain Flax come from the Natural Medicines adverse-effect record, quoted above. Where a percentage is shown, it is the share of 313,746 voluntary FDA FAERS reports for Lisinopril that mention that effect — a reporting proportion, not an incidence rate and not evidence the drug caused it. Wording is matched across sources by our own clinical vocabulary, so treat this as a prompt to pay attention, not a diagnosis.

Special populations

Mountain Flax in Pregnancy & Breastfeeding

Pregnancy And Lactation Unsafe

When used orally due to possible emetic effects.

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

From our Q&A

Questions About Mountain Flax or Lisinopril

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Mountain Flax or Lisinopril, 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 Lisinopril

This page covers Mountain Flax only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Lisinopril page lists 167 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), American Hellebore (major), American Mistletoe (major), Asarabacca (major) and Siberian Cocklebur (major).

By severity: 6 major · 137 moderate · 24 minor.

From our pharmacist’s overview on the Lisinopril page

“Lisinopril is an ACE inhibitor that lowers blood pressure and protects the heart and kidneys, so the 167 supplements and herbs on this page warrant genuine care. Six carry a major rating, and those deserve your attention first.”

Reviewed by 2 · Jul 18, 2026

Open the Lisinopril interaction page

How much people look this up

Where Mountain Flax and Lisinopril 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 Mountain Flax
Steady interest

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

29 days ago today
Medication Lisinopril
Top 1%

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

What is Mountain Flax?

  • Constipation
  • Laxative/purgative
  • Liver and digestive complaints
  • Joint and rheumatic discomfort
  • Traditional 'cleansing' remedies

Mountain Flax (Linum catharticum) is a small wild flax once used in traditional European herbalism mainly as a strong laxative or purgative. There is very little modern scientific evidence to support its use, and it can be harsh on the gut, so it is rarely recommended today. If you are considering any herbal laxative, talk to your pharmacist or doctor first.

Linum catharticum · Linaceae · Whole flowering plant (dried aerial parts) · Dried herb, tea/infusion, tincture (rare today)

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

Mountain Flax: dosing

There is no established or standardized dose for Mountain Flax, and it is not a common modern product. Older herbal traditions used small amounts of the dried plant as a tea, but exact safe amounts have not been studied.Because of this uncertainty and its strong purgative effect, we cannot recommend a specific dose.

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

Read the full Mountain Flax monograph & all interactions
Medication

About Lisinopril

What Is Lisinopril Used For?

Brand names: Zestril, Prinivil, Qbrelis

Lisinopril treats high blood pressure (hypertension) in adults and children 6 years and older, and can be used alone or alongside other blood pressure medicines. Lowering blood pressure reduces the risk of strokes and heart attacks. The tablet combination product containing lisinopril and hydrochlorothiazide is specifically indicated for high blood pressure.

Lisinopril is also used as an add-on therapy to reduce signs and symptoms of systolic heart failure, and to reduce the risk of death in people who are hemodynamically stable (have reasonably stable circulation) within 24 hours of an acute heart attack (acute myocardial infarction).

Most-Reported Side Effects for Lisinopril

From FAERS, the FDA’s public side-effect reporting system (313,746 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Fatigue 20,515 reports
Nausea 19,130 reports
Diarrhea 17,858 reports
Dyspnea 14,363 reports
Dizziness 13,969 reports
See full Lisinopril drug information
Keep checking

Other Drugs & Mountain Flax

Browse every other medication we’ve checked against Mountain Flax — 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 Mountain Flax 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 Mountain Flax list.

See the full Mountain Flax interactions page
See every supplement checked against Lisinopril, ranked by severity
Evidence & sources

Mountain Flax References

The 1 references that drive our Mountain Flax 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. Gruenwald J, Brendler T, Jaenicke C. PDR for Herbal Medicines. 1st ed. Montvale, NJ: Medical Economics Company, Inc., 1998.

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 Mountain Flax and Lisinopril Together: Common Questions

Is it safe to take Mountain Flax with Lisinopril?
We do not list a known interaction between Mountain Flax and Lisinopril. 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 Mountain Flax and Lisinopril have any of the same side effects?
Yes — our sources link each of them separately to 2 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 Lisinopril interact with any supplements?
Yes. Lisinopril has documented interactions with 167 supplements in our database — Mountain Flax is not one of them. The Lisinopril 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

Mountain Flax monograph Uses, safety profile, and every drug interaction in one place Lisinopril drug information The full plain-English guide to this medication Lisinopril supplement interactions Every supplement checked against Lisinopril, 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 Lisinopril and Mountain Flax?

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.