Drug & supplement interaction

American Ivy + Polythiazide, Reserpine

Polythiazide, Reserpine brand name: Renese R.

Moderate Interaction
Medically reviewed by · Updated February 2024
The bottom line Moderate

American Ivy has a moderate interaction with Polythiazide, Reserpine. The berries of American ivy contain up to 2% oxalic acid, which can be toxic because it has the potential to cause kidney failure by precipitating solid calcium oxalate.

Read the full interaction report
SeverityModerate
LikelihoodUnlikely
EvidenceC
What do Severity, Likelihood & Evidence mean?
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Interaction report

American Ivy and Polythiazide, Reserpine

Here is the interaction we found between these two, with the evidence behind it.

Moderate

Thiazide Diuretics

Why this applies to Polythiazide, Reserpine

Polythiazide, Reserpine falls under Thiazide Diuretics — the group American Ivy interacts with.

The berries of American ivy contain up to 2% oxalic acid, which can be toxic because it has the potential to cause kidney failure by precipitating solid calcium oxalate. Thiazide diuretics are often prescribed to decrease urinary calcium levels and prevent the formation of calcium oxalate kidney stones. Consequently, the berries of American ivy and thiazide diuretics may have opposing effects in this context, as the diuretics work to lower urinary calcium levels while the oxalic acid in the berries could potentially increase the risk of kidney stone formation. It is important to note that medicinal supplements utilizing American ivy generally only make use of the bark, not the berries.
Severity Moderate Likelihood Unlikely Evidence C

Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans..

Dr. Brian Staiger, PharmD, BCPS
Dr. Brian Staiger explains PharmD, Clinical Pharmacist

Your Renese R combines two medicines, but the one that matters here is the thiazide piece (polythiazide). Doctors sometimes use thiazide diuretics specifically to lower the amount of calcium in your urine, which helps keep calcium oxalate kidney stones from forming. The catch is that American ivy berries contain oxalic acid, the very thing that can join with calcium and build stones. So in theory the berries could push in the opposite direction of what your medicine is trying to do.

This concern is mostly theoretical and unlikely, and it really applies to the poisonous berries, not the bark used in most supplements. Even so, if you take Renese R, it is smart to skip ivy berries entirely. Check with your pharmacist or doctor before trying any American ivy product.

Contact Dr. Brian directly if you have additional questions on this interaction

What These Ratings Mean

Every interaction above is graded three ways — here’s the key to each label.

Severity how clinically significant the interaction is
Major

Clinically significant. Avoid the combination, or use only under close professional supervision.

Moderate

Usually worth avoiding or managing — may need monitoring, a dose change, or timing apart.

Minor

Generally not serious. Be aware of it and mention it to your pharmacist.

Likelihood how strong the evidence is that the interaction actually happens in people
  • LikelyWell-controlled human studies have demonstrated the likely existence of this interaction.
  • ProbableInteraction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
  • PossibleInteraction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists.
  • UnlikelyInteraction has been demonstrated in animal or in lab research but has been shown not to occur in humans.
Evidence the quality of the studies behind the rating (graded A–D)
  • AHigh-quality meta-analysis (quantitative systematic review).
  • BCase-control study.
  • CConsensus.
  • DAnecdotal evidence.

These ratings are for information only. Never start, stop, or otherwise change your therapy before speaking with your provider.

Keep it in perspective

American Ivy Also Interacts With Other Medications

American Ivy has 55 moderate known drug interactions in our database — the Polythiazide, Reserpine one above is one of them. If you take anything else, check it against the full list below.

Moderate 55 No known interaction 2,775 (incl. Polythiazide, Reserpine)
Taking anything else?

Check Another of Your Medications Against American Ivy

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

Everything else you take

See Every Supplement That Interacts With Polythiazide, Reserpine

This page covers American Ivy only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Polythiazide, Reserpine page lists 228 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 Dolomite (major).

By severity: 10 major · 193 moderate · 25 minor.

From our pharmacist’s overview on the Polythiazide, Reserpine page

“American hellebore is the ingredient I would keep farthest from polythiazide with reserpine (Renese R), a combination pill prescribed to lower blood pressure. Its alkaloids can drop pressure and slow the heart even at small doses, and it is one of ten major-rated entries among the 228 on file here, which puts this list in the take-it-s…”

Reviewed by 2 · Jul 18, 2026

Open the Polythiazide, Reserpine interaction page

How much people look this up

Where American Ivy and Polythiazide, Reserpine 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 Ivy
Steady interest

#1,141 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Polythiazide, Reserpine
Steady interest

#2,415 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.

Supplement

About American Ivy

What is American Ivy?

American Ivy
  • Digestive upset
  • To stimulate sweating
  • Traditional tonic use
  • Skin and swelling complaints (topical folk use)

American Ivy (Virginia creeper) is mainly an ornamental climbing vine with a long history of folk use for digestion and sweating, but there is very little human evidence to support any health benefit. Its berries contain oxalic acid and are considered poisonous, and the plant can irritate the skin. Because safety data is limited, talk with your pharmacist or doctor before using it.

Read the full American Ivy monograph & all interactions
Keep checking

Other Drugs & American Ivy

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

0Major
55Moderate
0Minor
2,774No known interaction
55 Moderate 2,774 No interaction
Moderate

55 interactions

No interaction 2,774 drugs checked — show the list

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

Showing the 60 most looked-up of 2,774 medications checked with no known interaction — see the full American Ivy list.

See the full American Ivy interactions page
See every supplement checked against Polythiazide, Reserpine, ranked by severity
Sources

Sources & How We Checked

Interaction details are evidence-graded and sourced from the Natural Medicines database. The medication overview comes from MedlinePlus.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

Keep exploring
American Ivy monograph › Uses, safety, and every drug interaction in one place Polythiazide, Reserpine supplement interactions › Every supplement checked against Polythiazide, Reserpine, 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 Ask a pharmacist › Free, personal answer from our licensed team
Pharmacist Counseling Corner

Taking American Ivy and Polythiazide, Reserpine Together: Common Questions

Can you take American Ivy with Polythiazide, Reserpine?
There is a moderate interaction, so it may be acceptable with monitoring or timing changes — but check with your pharmacist first. Read the full details on this page and confirm with your pharmacist before combining them.
How serious is the American Ivy and Polythiazide, Reserpine interaction?
We rate it Moderate. This combination may require monitoring, a dose adjustment, or separating the times you take each one. Consult your pharmacist before using them together.

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

Still Have a Question About Polythiazide, Reserpine and American Ivy?

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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.