Drug & supplement interaction

Sea Buckthorn + Isosorbide Dinitrate, Hydralazine

Isosorbide Dinitrate, Hydralazine brand name: BiDil.

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

Sea Buckthorn has a moderate interaction with Isosorbide Dinitrate, Hydralazine. Theoretically, taking sea buckthorn with antihypertensive drugs might increase the risk of hypotension.

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

Sea Buckthorn and Isosorbide Dinitrate, Hydralazine

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

Moderate

ANTIHYPERTENSIVE DRUGS

Why this applies to Isosorbide Dinitrate, Hydralazine

Isosorbide Dinitrate, Hydralazine falls under ANTIHYPERTENSIVE DRUGS — the group Sea Buckthorn interacts with.

Theoretically, taking sea buckthorn with antihypertensive drugs might increase the risk of hypotension.
Taking sea buckthorn appears to reduce blood pressure in some patients.
Severity Moderate 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

BiDil combines two medicines that relax and widen your blood vessels to lower blood pressure and ease the heart's workload. Sea buckthorn, when taken as a concentrated supplement, may nudge blood pressure down a little on its own. Stack that gentle effect on top of BiDil and, in theory, your pressure could dip lower than intended.

If that happens, you might feel dizzy, lightheaded, or headachy, especially when you stand up quickly. I'll be honest with you though: this concern is theoretical, based on how these things work rather than strong studies. Eating sea buckthorn berries in normal food amounts is unlikely to cause trouble. Before starting a concentrated supplement, just check with your pharmacist or doctor so they can keep an eye on your readings.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Chang BB, Wang F Xu TY Zhang QQ He J Zhang XJ Li J. Total flavones of Hippophae rhamnoides L. for essential hypertension: a systematic review of randomized controlled trials. Chinese Journal of Evidence-Based Medicine. 2009;9(11):1207-1213. DOI

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

Sea Buckthorn Also Interacts With Other Medications

Sea Buckthorn has 288 moderate known drug interactions in our database — the Isosorbide Dinitrate, Hydralazine one above is one of them. If you take anything else, check it against the full list below.

Moderate 288 No known interaction 2,542 (incl. Isosorbide Dinitrate, Hydralazine)
Taking anything else?

Check Another of Your Medications Against Sea Buckthorn

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

Everything else you take

See Every Supplement That Interacts With Isosorbide Dinitrate, Hydralazine

This page covers Sea Buckthorn only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Isosorbide Dinitrate, Hydralazine page lists 137 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), American Hellebore (major), American Mistletoe (major), Coleus (major) and Hawthorn (major).

By severity: 6 major · 110 moderate · 21 minor.

From our pharmacist’s overview on the Isosorbide Dinitrate, Hydralazine page

“BiDil pairs isosorbide dinitrate with hydralazine to relax blood vessels in failing hearts, which is why the 137 supplements on this list deserve genuine care. Nearly all act on blood pressure, either stacking with the drug and dropping it too far or pushing back and undoing the treatment.”

Reviewed by 2 · Jul 18, 2026

Open the Isosorbide Dinitrate, Hydralazine interaction page

One more smart check

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

We hold 253 real supplement products containing Sea Buckthorn, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Sea Buckthorn. Your product may carry other ingredients that interact with Isosorbide Dinitrate, Hydralazine too, on top of Sea Buckthorn — 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 Sea Buckthorn and Isosorbide Dinitrate, Hydralazine 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 Sea Buckthorn
Top half

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

29 days ago today
Medication Isosorbide Dinitrate, Hydralazine
Top 25%

#482 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 Sea Buckthorn

What is Sea Buckthorn?

Sea Buckthorn
  • Skin health and dryness
  • Dry eye symptoms
  • Digestive complaints
  • Heart and cholesterol support
  • General antioxidant and immune support

Sea buckthorn is a berry-bearing shrub rich in vitamins, carotenoids, and fatty acids that people use for skin, eye, digestive, and heart health. Early research is promising for a few uses like dry skin and dry eye, but most claims are not yet proven. It is generally well tolerated as a food, but talk to your pharmacist before using concentrated supplements.

Read the full Sea Buckthorn monograph & all interactions
Keep checking

Other Drugs & Sea Buckthorn

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

0Major
288Moderate
0Minor
2,541No known interaction
288 Moderate 2,541 No interaction
Moderate

288 interactions

Showing 60 of 288 moderate interactions — see all 288 on the Sea Buckthorn page.

No interaction 2,541 drugs checked — show the list

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

Showing the 60 most looked-up of 2,541 medications checked with no known interaction — see the full Sea Buckthorn list.

See the full Sea Buckthorn interactions page
See every supplement checked against Isosorbide Dinitrate, Hydralazine, 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
Sea Buckthorn monograph › Uses, safety, and every drug interaction in one place Isosorbide Dinitrate, Hydralazine supplement interactions › Every supplement checked against Isosorbide Dinitrate, Hydralazine, 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 Sea Buckthorn and Isosorbide Dinitrate, Hydralazine Together: Common Questions

Can you take Sea Buckthorn with Isosorbide Dinitrate, Hydralazine?
There is a moderate interaction, so it may be acceptable with monitoring or timing changes — but check with your pharmacist first. Read the full details on this page and confirm with your pharmacist before combining them.
How serious is the Sea Buckthorn and Isosorbide Dinitrate, Hydralazine interaction?
We rate it Moderate. This combination may require monitoring, a dose adjustment, or separating the times you take each one. Consult your pharmacist before using them together.

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

Still Have a Question About Isosorbide Dinitrate, Hydralazine and Sea Buckthorn?

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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.