Herb & supplement monograph

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

But these pages have grown well beyond that into a full monograph — what Juniper 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

Check Juniper against your medication

Add one medication

✓ Supplement

Juniper

1 Your medication

Start typing any prescription or over-the-counter drug name.

Reviewed by licensed pharmacists Sourced from Natural Medicines

On this page

Juniper 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 Juniper drug interaction appears low for most people. None of the listed interactions are rated major, and all of them rest on theoretical or animal research rather than documented problems in people.

Interactions deserving the most attention

The combination most worth watching is juniper with diabetes medications. Animal research shows juniper berry can lower blood sugar, so adding it to these drugs could, in theory, push blood sugar too low, and blood sugar is something that needs to stay in a tight range. Juniper may also have a mild water-pill effect, which is why lithium appears here, since anything that changes how the kidneys handle fluid could nudge lithium levels, a medicine with a narrow safety margin. The same mild effect could slightly add to prescription diuretics, though this is rated a minor concern.

What the rest of the list means

Juniper appears alongside a long list of medications, but that number mostly reflects broad drug categories, not proven problems. Every interaction here is theoretical, based on effects seen in animal or lab studies, and none has been confirmed to cause meaningful changes in people. For most everyday medications, no harmful combination with juniper has been documented.

Check your medications against Juniper

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

Interaction report

Drugs that interact with Juniper

162 medications have a known interaction with Juniper, 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 Juniper using our pharmacist-reviewed interaction data.

AI summaries are generated from our Juniper 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 Juniper 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 Juniper affects

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

All 3 drug categories Juniper interacts with

Antidiabetes DrugsDiuretic DrugsLithium

Antidiabetes Drugs

Theoretically, taking juniper berry with antidiabetes medications might cause additive hypoglycemia.
Animal research shows that juniper berry can lower blood glucose.

Likelihood Possible Evidence D

Diuretic Drugs

Theoretically, juniper berry might increase the risk of adverse effects from diuretic drugs.
Juniper berry is thought to have mild diuretic effects.

Likelihood Possible Evidence D

Lithium

Theoretically, juniper berry might reduce lithium excretion and increase serum levels of lithium.
Juniper berry is thought to have mild diuretic effects.

Likelihood Possible Evidence D

Monograph

Juniper: Uses, Safety & Side Effects

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

The bottom line

Juniper berry is a traditional herb best known for flavoring gin and for its folk use as a diuretic and digestive aid. Solid human evidence for its health benefits is limited, and it can irritate the kidneys with high doses or long-term use. Pregnant people and those with kidney problems should avoid it, and everyone should check with a pharmacist or doctor first.

Scientific name: Juniperus communis
Family: Cupressaceae
Part used: Berries (ripe cones) and essential oil
Common forms: Tea, capsules, tincture, essential oil, dried berries

People commonly use it for

Water retention (diuretic)
Digestive upset and bloating
Urinary tract support
Joint and muscle discomfort
Flavoring (gin and food)

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

Safety at a glance

OverallUse caution

Generally tolerated in food amounts, but medicinal doses may irritate the kidneys and should not be used long-term.

PregnancyUnsafe

When used orally. Juniper can increase uterine tone, interfere with fertility and implantation, and cause abortion.

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

Juniper comes from an evergreen shrub or small tree called Juniperus communis, which grows across Europe, Asia, and North America. The part most often used is the small, dark-blue berry, which is actually a soft cone.

People have used juniper berries for hundreds of years in food and folk medicine. The berries give gin its signature flavor and are also used as a spice in cooking. As a supplement, juniper is taken as a tea, capsule, tincture, or essential oil.

In traditional use, juniper has been valued mainly as a diuretic (to increase urine) and as a digestive aid. Today it is still sold for these and other purposes, though strong scientific proof is limited.

How it works

Juniper berries contain an essential oil rich in compounds such as terpinen-4-ol and other terpenes. Terpinen-4-ol is thought to be part of why juniper may act as a diuretic, possibly by affecting how the kidneys handle water and salt.

The plant also contains flavonoids and other antioxidants. In laboratory and animal studies, juniper extracts have shown antioxidant, anti-inflammatory, and antimicrobial activity. However, results seen in a test tube or in animals do not always carry over to people.

It is important to know that some of the same oil compounds that may cause its effects can also irritate the kidneys when used in large amounts or for a long time.

Effectiveness

Does Juniper work?

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

Evidence overview · 10 uses evaluated

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

Also studied for 10 conditions — evidence insufficient to rate

Insufficient Reliable Evidence To Rate Bronchitis