Drug & supplement interaction

Juniper + Theobromine

Theobromine brand name: Theobromine.

Minor Interaction
Medically reviewed by · Updated September 2026
The bottom line Minor

Juniper has a minor interaction with Theobromine. Theoretically, juniper berry might increase the risk of adverse effects from diuretic drugs.

Read the full interaction report
SeverityMinor
LikelihoodPossible
EvidenceD
What do Severity, Likelihood & Evidence mean?
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Interaction report

Juniper and Theobromine

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

Minor

DIURETIC DRUGS

Why this applies to Theobromine

Theobromine falls under DIURETIC DRUGS — the group Juniper interacts with.

Theoretically, juniper berry might increase the risk of adverse effects from diuretic drugs.
Juniper berry is thought to have mild diuretic effects.
Severity Minor Likelihood Possible Evidence D

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.

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

Here's the simple version. Theobromine (a caffeine-like compound found in cocoa) gently nudges your body to make more urine, so it acts as a mild diuretic. Juniper, the herb that flavors gin, is also thought to have a mild water-pill effect. Put the two together and you could lose a little more fluid than usual.

This is a theoretical concern, meaning it's based on how these two behave on paper, not on real cases. The practical worry is just stacking two mild diuretics, which might leave you a bit dehydrated, lightheaded, or running to the bathroom more. If you use both regularly, it's worth a quick chat with your pharmacist or doctor, especially if you have kidney concerns.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Newall CA, Anderson LA, Philpson JD. Herbal Medicine: A Guide for Healthcare Professionals. London, UK: The Pharmaceutical Press, 1996.
  2. Robbers JE, Tyler VE. Tyler's Herbs of Choice: The Therapeutic Use of Phytomedicinals. New York, NY: The Haworth Herbal Press, 1999.

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

Juniper Also Interacts With Other Medications

Juniper has 86 moderate, 75 minor known drug interactions in our database — the Theobromine one above is one of them. If you take anything else, check it against the full list below.

Moderate 86 Minor 75 No known interaction 2,669 (incl. Theobromine)
Taking anything else?

Check Another of Your Medications Against Juniper

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

Everything else you take

See Every Supplement That Interacts With Theobromine

This page covers Juniper only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Theobromine page lists 97 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), American Mistletoe (major), Ephedra (major), Lithium (major) and Oleander (major).

By severity: 7 major · 75 moderate · 15 minor.

From our pharmacist’s overview on the Theobromine page

“Theobromine, the caffeine cousin found in chocolate and used medically as a mild diuretic and blood vessel relaxer, deserves real care around supplements. Most of the trouble runs through its diuretic action: dozens of herbs, from aloe latex to apple cider vinegar, either add their own fluid-losing effect or drain potassium, and togeth…”

Reviewed by 2 · Jul 18, 2026

Open the Theobromine interaction page

One more smart check

Taking Juniper as Part of a Dietary Supplement Product? Check It for Interactions

We hold 1,100 real supplement products containing Juniper, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Juniper. Your product may carry other ingredients that interact with Theobromine too, on top of Juniper — and those would not show on this page. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Juniper and Theobromine 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 Juniper
Top 25%

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

29 days ago today
Medication Theobromine
Top half

#1,188 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 Juniper

What is Juniper?

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

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.

Read the full Juniper monograph & all interactions
Keep checking

Other Drugs & Juniper

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

0Major
86Moderate
75Minor
2,668No known interaction
86 Moderate 75 Minor 2,668 No interaction
Moderate

86 interactions

Showing 60 of 86 moderate interactions — see all 86 on the Juniper page.

Minor

75 interactions

Showing 60 of 75 minor interactions — see all 75 on the Juniper page.

No interaction 2,668 drugs checked — show the list

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

Showing the 60 most looked-up of 2,668 medications checked with no known interaction — see the full Juniper list.

See the full Juniper interactions page
See every supplement checked against Theobromine, 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
Juniper monograph › Uses, safety, and every drug interaction in one place Theobromine supplement interactions › Every supplement checked against Theobromine, 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 Juniper and Theobromine Together: Common Questions

Can you take Juniper with Theobromine?
There is only a minor interaction, which is usually not serious. Read the full details on this page and confirm with your pharmacist before combining them.
How serious is the Juniper and Theobromine interaction?
We rate it Minor. This interaction is generally not clinically significant, but it remains worth noting and discussing with your pharmacist.

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

Still Have a Question About Theobromine and Juniper?

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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.