Poison Ivy Drug Interactions, Uses, Side Effects & More

Interaction report

Drugs that interact with Poison Ivy

0 medications have a known interaction with Poison Ivy, graded by severity. Select any drug for the full evidence-based detail.

We don’t currently list any known drug interactions for Poison Ivy. This doesn’t guarantee none exist — always confirm with your pharmacist before combining supplements with your medications.

Read The List Like a Pharmacist

What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
Probable. Interaction 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.
Possible. Interaction 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
Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
Each drug listed above links to the full report for that exact Poison Ivy combination — clinical detail, likelihood, evidence level, and citations.
Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

Monograph

Poison Ivy: Uses, Safety & Side Effects

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS · Reviewed July 2026 ·

The bottom line

Poison ivy is a toxic plant best known for causing an itchy, blistering allergic rash on contact. In supplement form it is sold almost exclusively as an extremely dilute homeopathic remedy (Rhus tox) for joint and muscle pain, but reliable evidence that it works is lacking, and the raw plant should never be used or ingested.

Scientific name: Toxicodendron radicans
Family: Anacardiaceae
Part used: Leaves, stems, and root (used in highly diluted homeopathic preparations); fresh plant in traditional use
Common forms: Homeopathic pellets, tablets, and topical preparations (sold as 'Rhus tox' or 'Rhus toxicodendron')

People commonly use it for

Joint pain and stiffness
Muscle soreness or strains
Skin rashes and itching
Arthritis discomfort
Restlessness with body aches

Popular and traditional uses — not proof it works. See “Uses & effectiveness” below for the evidence.

Safety at a glance

OverallBest avoided

The raw plant is toxic and a potent allergen; only highly diluted homeopathic products are sold, and even these have no proven benefit.

PregnancyLikely Unsafe

When used orally or topically; avoid using.

Read the full pregnancy detail

BreastfeedingLikely Unsafe

When used orally or topically; avoid using.

Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center). Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

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Overview

Poison ivy (often labeled Toxicodendron radicans or the older name Rhus toxicodendron) is a climbing or trailing plant native to North America. It is famous for the oil in its leaves and stems, called urushiol, which causes an itchy, blistering skin rash in most people who touch it.

Despite being a toxic plant, poison ivy is sold as a remedy in homeopathic form, where it is known as Rhus tox. In these products the plant is diluted so many times that little or none of the original substance usually remains. Homeopathic Rhus tox is traditionally promoted for joint pain, stiffness, muscle soreness, and certain skin complaints.

The fresh, raw plant is never used as a regular dietary supplement and should not be eaten or applied to the skin.

How it works

The poison ivy plant contains urushiol, an oily compound that triggers an allergic immune reaction in the skin. This is what causes the well-known rash—not a medicinal benefit.

Homeopathic Rhus tox is based on the idea of "like cures like," meaning a substance that causes certain symptoms in large amounts is thought to relieve similar symptoms when extremely diluted. However, because the product is usually diluted past the point where any plant molecules remain, there is no accepted scientific mechanism to explain how it would work in the body.

Any proposed actions are based on homeopathic theory rather than on confirmed laboratory or clinical findings.

Effectiveness

Does Poison Ivy work?

Here’s what the research actually shows for each use — graded by Natural Medicines and reviewed by Dr. Brian Staiger, PharmD.

Evidence overview · 6 uses evaluated

6 Insufficient evidence

How to read these evidence grades

Natural Medicines’ 7-point scale. We show each rating’s label word-for-word.

1EffectiveStrong, consistent evidence it works.

2Likely EffectiveGood evidence, though not yet conclusive.

3Possibly EffectiveSome evidence suggests a benefit.

4Possibly IneffectiveSome evidence it may not help.

5Likely IneffectiveFairly strong evidence it doesn’t help.

6IneffectiveStrong evidence it doesn’t work.

7Insufficient Reliable Evidence to RateToo little research to say either way.

For Poison Ivy, current evidence isn’t strong enough to rate any specific use. The conditions it has been studied for are listed below.

Also studied for 6 conditions — evidence insufficient to rate

Insufficient Reliable Evidence To Rate Back pain