Herb & supplement monograph

Elderflower Drug Interactions, Uses, Effectiveness, Safety & More

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

What is this page for?

First and foremost: how Elderflower interacts with medications. The heart of this page is the interaction list — every drug Elderflower is known to interact with, and how serious each one is.

But these pages have grown well beyond that into a full monograph — what Elderflower is, what people use it for and how strong the evidence is, its safety and side effects, and answers to the questions we’re asked most — written and reviewed by the clinical staff at HelloPharmacist. It’s educational information from our licensed clinical databases, not medical advice, and we don’t sell or endorse products. Our editorial policy

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On this page

Elderflower Drug Interactions: The Bottom Line

From the HelloPharmacist Editorial Team · Updated July 2026

Based on the available evidence, the overall risk of a clinically significant Elderflower drug interaction appears low for most people, since the only documented concern is theoretical. Although the listed interactions are all rated moderate, every one traces back to a single concern supported only by laboratory research, not human studies.

Interactions deserving the most attention

The one area worth watching involves diabetes medications. Lab research suggests elderflower might lower blood sugar, so in theory it could add to the effect of these drugs and increase the chance of low blood sugar. Because blood sugar is closely monitored in people with diabetes, anyone taking these medicines should keep an eye on their readings while using elderflower. This effect has not been confirmed in people.

What the rest of the list means

The long list of interacting medications can look worrying, but it reflects one possible mechanism applied across the many drugs used to manage blood sugar, not dozens of separate proven problems. So far, the evidence comes from lab studies only, and no human research has shown that elderflower meaningfully changes how these medicines work.

Check your medications against Elderflower

Based on HelloPharmacist’s Elderflower interaction data and reviewed under our editorial standards.

Interaction report

Drugs that interact with Elderflower

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

Don’t want to scroll the list? Just ask.

Tell us the medications you take and we’ll check each one against Elderflower using our pharmacist-reviewed interaction data.

AI summaries are generated from our Elderflower interaction data for education only — always confirm with your pharmacist. How we use AI

2,830 drugs

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 Elderflower combination — clinical detail, likelihood, evidence level, and citations.
Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

The big picture

The kinds of drugs Elderflower affects

Every type of medication (drug category) Elderflower is known to interact with. Open any category for the detail — or search your exact drug in the checker above.

All 1 drug category Elderflower interacts with

Antidiabetes Drugs

Theoretically, elderflower might increase the risk of hypoglycemia when taken with antidiabetes drugs.
In vitro research suggests that elderflower might lower blood glucose levels. Monitor blood glucose levels closely.

Likelihood Possible Evidence D

Monograph

Elderflower: Uses, Safety & Side Effects

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

The bottom line

Elderflower comes from the elder plant (Sambucus nigra) and is traditionally used as a tea or extract for colds, sinus congestion, and fever. Good-quality human evidence is limited, so it should be seen as a soothing traditional remedy rather than a proven treatment. Raw or unripe parts of the plant can be toxic, so use only properly prepared products, and check with your pharmacist or doctor first.

Scientific name: Sambucus nigra
Family: Adoxaceae
Part used: Dried flowers
Common forms: Tea, liquid extract, tincture, capsules, syrups, lozenges

People commonly use it for

Colds and flu
Sinus congestion
Fever and sweating
Sore throat
Coughs

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

Safety at a glance

OverallUse caution

Properly prepared flowers are generally well tolerated, but raw plant parts can be toxic.

PregnancyInsufficient reliable information

Insufficient reliable information available; avoid using.

Read the full pregnancy detail

BreastfeedingInsufficient reliable information

Insufficient reliable information available; 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.

Jump to a section

Overview

Elderflower is the small, creamy-white cluster of flowers from the elder plant, known scientifically as Sambucus nigra. The same plant also produces dark purple elderberries, which are used separately. Elder grows widely across Europe, parts of Asia, and North America, often in hedgerows and along roadsides.

People have used elderflower for centuries in traditional medicine and in foods and drinks, such as cordials and teas. Today it is sold as a dried herbal tea, liquid extract, tincture, and as part of combination products for colds and sinus problems.

How it works

Elderflower contains plant compounds such as flavonoids (including quercetin and rutin), phenolic acids, and small amounts of essential oils. In laboratory studies, these compounds show antioxidant and anti-inflammatory activity.

Traditionally, elderflower is thought to promote sweating and help loosen mucus, which is why it has been used for fevers and congestion. It is important to note that these proposed actions are mostly based on laboratory and animal research or on tradition, and have not been clearly confirmed in well-designed human studies.

Effectiveness

Does Elderflower work?

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

Evidence overview · 9 uses evaluated

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

Also studied for 9 conditions — evidence insufficient to rate

Insufficient Reliable Evidence To Rate Acute bronchitis