Drug & supplement interaction

Oleander + Doripenem

Doripenem brand name: Doribax.

Major Interaction
Medically reviewed by · Updated October 2026
The bottom line Major

Doripenem falls into 2 drug categories that Oleander can interact with; the most serious is rated major. Theoretically, macrolide antibiotics may increase the risk of oleander toxicity.

Read the full interaction report
SeverityMajor
LikelihoodProbable
Interactions2
EvidenceD
What do Severity, Likelihood & Evidence mean?
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Interaction report

Oleander and Doripenem

These two interact in 2 distinct ways. Each one is explained separately below.

Why Are There 2 Interactions?

Oleander interacts with whole categories of medication. Doripenem falls into 2 of those categories, so it can interact with Oleander in 2 different ways. We’ve listed each one below — your overall risk is driven by the most serious of them (Major).

Major

MACROLIDE ANTIBIOTICS

1 of 2

Why this applies to Doripenem

Doripenem falls under MACROLIDE ANTIBIOTICS — the group Oleander interacts with.

Theoretically, macrolide antibiotics may increase the risk of oleander toxicity.
Macrolide antibiotics reduce levels of bacteria in the gut that break down digoxin to inactive metabolites, increasing digoxin bioavailability. Theoretically, this same process could increase the bioavailability of cardiac glycosides in oleander, increasing its toxicity.
Severity Major Likelihood Probable Evidence D

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..

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

First things first: I want to steer you away from oleander altogether. It's a genuinely poisonous plant, and the heart-acting chemicals in it (similar to digoxin) can be deadly even in tiny amounts. There's no safe dose to self-experiment with.

Now, about doripenem (Doribax). The interaction on file was really written for macrolide antibiotics, where certain gut bacteria that normally break down these heart compounds get knocked down, letting more of the poison get absorbed. Doripenem is a different class (a carbapenem), and it isn't a prodrug, so this concern is theoretical and not well established for it. Still, any antibiotic that shifts your gut bacteria could in theory let more oleander toxin into your system, raising the risk of dangerous heart rhythm problems, nausea, and vomiting. Please don't combine them, and talk with your pharmacist or doctor first.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Ellenhorn MJ, et al. Ellenhorn's Medical Toxicology: Diagnoses and Treatment of Human Poisoning. 2nd ed. Baltimore, MD: Williams & Wilkins, 1997.
Major

TETRACYCLINE ANTIBIOTICS

2 of 2

Doripenem also falls under TETRACYCLINE ANTIBIOTICS.

Theoretically, tetracycline antibiotics may increase the risk of oleander toxicity.
Tetracycline antibiotics reduce levels of bacteria in the gut that break down digoxin to inactive metabolites, increasing digoxin bioavailability. Theoretically, this same process might increase the bioavailability of cardiac glycosides in oleander, increasing its toxicity.
Severity Major Likelihood Probable Evidence D

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..

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

First things first: oleander itself is genuinely dangerous and isn't something I'd ever recommend taking, no matter what else you're on. It carries heart-affecting compounds that work a lot like digoxin, and even tiny amounts can throw off your heart rhythm. So the bigger concern here is the oleander, full stop.

The interaction on file lumps your antibiotic in with the tetracyclines, where the theory is that wiping out certain gut bacteria lets more of those heart toxins get absorbed. Honestly, doripenem (Doribax) isn't a tetracycline, and this idea is only theoretical, based on how drugs behave on paper rather than real cases. Doripenem is a fully active antibiotic, not a prodrug, so it doesn't change in your body either way. Please don't use oleander at all, and check with your pharmacist or doctor about any combination.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Ellenhorn MJ, et al. Ellenhorn's Medical Toxicology: Diagnoses and Treatment of Human Poisoning. 2nd ed. Baltimore, MD: Williams & Wilkins, 1997.

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

Oleander Also Interacts With Other Medications

Oleander has 132 major, 23 moderate known drug interactions in our database — the Doripenem one above is among them. If you take anything else, check it against the full list below.

Major 132 Moderate 23 No known interaction 2,675 (incl. Doripenem)
Taking anything else?

Check Another of Your Medications Against Oleander

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

Everything else you take

See Every Supplement That Interacts With Doripenem

This page covers Oleander only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Doripenem page lists 84 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Para-aminobenzoic Acid (paba) (major), Acerola (moderate), Alpha-lipoic Acid (moderate), Bacillus Coagulans (moderate) and Bacillus Subtilis (moderate).

By severity: 2 major · 75 moderate · 7 minor.

From our pharmacist’s overview on the Doripenem page

“Two entries here matter more than all the others, and I would read them first. Doripenem (Doribax) is an intravenous antibiotic reserved for serious bacterial infections, which means anything that weakens treatment or piles on risk deserves genuine caution.”

Reviewed by 2 · Jul 18, 2026

Open the Doripenem interaction page

How much people look this up

Where Oleander and Doripenem 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 Oleander
Top half

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

29 days ago today
Medication Doripenem
Top half

#1,033 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 Oleander

What is Oleander?

  • Heart failure (traditional)
  • Cancer (investigational)
  • Skin conditions
  • Asthma (folk use)
  • Pain relief (folk use)

Oleander is a highly poisonous ornamental plant, and every part of it can cause life-threatening heart and nervous system effects, even in small amounts. There is no proven safe dose for self-use, and serious poisonings and deaths have occurred from teas, extracts, and accidental ingestion. We strongly advise against using oleander as a supplement.

Read the full Oleander monograph & all interactions
Medication

About Doripenem Injection

What Is Doripenem Injection Used For?

Brand name: Doribax

  • Doripenem injection is used to treat serious infections of the urinary tract, kidney, and abdomen that are caused by bacteria. Doripenem injection is not approved by the Food and Drug Administration (FDA) to treat pneumonia that developed in people who were on a ventilator in a hospital. Doripenem injection is in a class of medications called carbapenem antibiotics. It works by killing bacteria.

  • Antibiotics such as doripenem injection will not work for colds, flu, or other viral infections. Taking antibiotics when they are not needed increases your risk of getting an infection later that resists antibiotic treatment.

See full Doripenem Injection drug information
Keep checking

Other Drugs & Oleander

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

132Major
23Moderate
0Minor
2,674No known interaction
132 Major 23 Moderate 2,674 No interaction
Major

132 interactions

Showing 60 of 132 major interactions — see all 132 on the Oleander page.

Moderate

23 interactions

No interaction 2,674 drugs checked — show the list

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

Showing the 60 most looked-up of 2,674 medications checked with no known interaction — see the full Oleander list.

See the full Oleander interactions page
See every supplement checked against Doripenem, 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
Oleander monograph › Uses, safety, and every drug interaction in one place Doripenem supplement interactions › Every supplement checked against Doripenem, ranked by severity Doripenem Injection drug information › The full plain-English guide to this medication 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 Oleander and Doripenem Together: Common Questions

Can you take Oleander with Doripenem?
This is rated a major interaction, so the combination is best avoided unless your doctor or pharmacist has specifically told you otherwise. Read the full details on this page and confirm with your pharmacist before combining them.
Why are there 2 interactions listed for Oleander and Doripenem?
Doripenem belongs to more than one drug category, and Oleander interacts with each of those categories a little differently. We list every one so nothing is missed — your overall risk is driven by the most serious of them.
How serious is the Oleander and Doripenem interaction?
We rate it Major. This is a clinically significant combination that is generally best avoided, or used only under the direct supervision of your physician or pharmacist.

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

Still Have a Question About Doripenem and Oleander?

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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.