Medication interaction hub

What Supplements Interact with Guanethidine, Hydrochlorothiazide?

Guanethidine, Hydrochlorothiazide brand name: Esimil. Every interaction below applies to the brands too.

231 Interactions 10 Major 196 Moderate 25 Minor
Curated & coded by · Clinical Pharmacist · Updated October 6, 2026

Drug–supplement interaction data sourced from Natural Medicines Pro, the licensed clinical database from TRC Healthcare / Therapeutic Research, with additional analysis by the HelloPharmacist Pharmacist Team. Our sources · Editorial policy

What is this page for?

One answer, for one medication: what supplements and herbal products interact with Guanethidine, Hydrochlorothiazide? Every vitamin, herb, and supplement ingredient we’ve checked against it is on this page, ranked by severity, each linking to the full report for that exact pair.

This page covers supplement interactions only — to check Guanethidine, Hydrochlorothiazide against your other medications, use the drug–drug interaction checker. Educational information from our licensed clinical databases, not medical advice. Our editorial policy

HelloPharmacist Bottom Line
Our Pharmacist Explains
What is this? The interaction data in the HelloPharmacist supplement database is licensed from Natural Medicines Pro by TRC Healthcare (Therapeutic Research). HelloPharmacist pharmacists often add our own analysis and context on top of that licensed data — such as this Bottom Line summary and the notes on individual interaction pages — and any such commentary is noted as ours.

Guanethidine with hydrochlorothiazide (Esimil) lowers blood pressure two ways at once, and 231 supplement and herbal ingredients on file can interfere with it, ten rated major and just 25 minor, so treat this page with genuine care. Most of the 196 moderate entries pile extra blood-pressure-lowering on top of the drug, and a second large group amplifies its water pill effect, which can drain potassium too far. Smaller clusters raise sun sensitivity, stress the kidneys, or block the drug from being absorbed, with activated charcoal a major example of that last problem.

Calcium and dolomite need attention too, since thiazides make your body hold onto calcium, and large supplemental doses can push levels high enough to injure the kidneys. Tyramine pulls the other way, raising blood pressure and undercutting the medication. Read the ten major entries first, then ask your pharmacist about any moderate one you actually take.

— , Clinical Pharmacist · July 18, 2026

Major 10 Moderate 196 Minor 25 No known interaction 1,221

This box checks one ingredient at a time (like turmeric or magnesium). Taking a supplement product with a whole label of ingredients? Search the product instead — we check every ingredient on it ↓

Most Viewed Ingredient Interactions

Guanethidine, Hydrochlorothiazide: Top Interactions at a Glance

The Guanethidine, Hydrochlorothiazide supplement & herbal interactions people checked most in the last 24 hours, colored by severity. Tap any ingredient to open the full report for that pair.

Showing the 12 highest-ranked of 231 interacting ingredients — plus 1,221 more checked with no known interaction. See the complete ranked list.

Start here

The Most-Checked Guanethidine, Hydrochlorothiazide Combinations Today

The Guanethidine, Hydrochlorothiazide + supplement pages people viewed most in the last 24 hours (resets at midnight). Open any card for the full report.

Moderate Likelihood Possible Flaxseed Oil + Guanethidine, Hydrochlorothiazidei

Theoretically, combining flaxseed oil with other antihypertensive drugs might have additive effects and increase the risk of hypotension.

Read the full interaction Moderate Likelihood Possible Cascara Sagrada + Guanethidine, Hydrochlorothiazidei

Theoretically, cascara sagrada might increase the risk of hypokalemia when taken with diuretic drugs.

Read the full interaction Moderate Likelihood Possible Gamboge + Guanethidine, Hydrochlorothiazidei

Overuse of gamboge might compound diuretic-induced potassium loss.

Read the full interaction Moderate Likelihood Possible Khat + Guanethidine, Hydrochlorothiazidei

Human research shows that khat and its constituent, cathinone, can increase blood pressure.

Read the full interaction Moderate Likelihood Possible Oregon Grape + Guanethidine, Hydrochlorothiazidei

Theoretically, Oregon grape might increase the risk of hypotension when taken with antihypertensive drugs.

Read the full interaction Moderate Likelihood Possible European Barberry + Guanethidine, Hydrochlorothiazidei

Theoretically, taking European barberry with antihypertensive drugs might increase the risk of hypotension.

Read the full interaction
The complete list

Every Supplement Checked Against Guanethidine, Hydrochlorothiazide

All 1,452 ingredients in our database, ranked by severity — 231 with a Guanethidine, Hydrochlorothiazide interaction on file and 1,221 with none found. Filter by severity or search any ingredient; hover the for what each ingredient is.

Looking for an interaction with a specific supplement product? Search products instead ↓

Straight answers

Can You Take It With Guanethidine, Hydrochlorothiazide?

One-line answers, one card per combination — scroll through today’s 20 and tap any card for the full report. A different set rotates in daily until every combination has had its turn.

Can you take Flaxseed Oil with Guanethidine, Hydrochlorothiazide?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, combining flaxseed oil with other antihypertensive drugs might have additive effects and increase the risk of hypotension.

Full Flaxseed Oil + Guanethidine, Hydrochlorothiazide answer

Can you take Cascara Sagrada with Guanethidine, Hydrochlorothiazide?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, cascara sagrada might increase the risk of hypokalemia when taken with diuretic drugs.

Full Cascara Sagrada + Guanethidine, Hydrochlorothiazide answer

Can you take Gamboge with Guanethidine, Hydrochlorothiazide?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Overuse of gamboge might compound diuretic-induced potassium loss.

Full Gamboge + Guanethidine, Hydrochlorothiazide answer

Can you take Khat with Guanethidine, Hydrochlorothiazide?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Human research shows that khat and its constituent, cathinone, can increase blood pressure.

Full Khat + Guanethidine, Hydrochlorothiazide answer

Can you take Oregon Grape with Guanethidine, Hydrochlorothiazide?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, Oregon grape might increase the risk of hypotension when taken with antihypertensive drugs.

Full Oregon Grape + Guanethidine, Hydrochlorothiazide answer

Can you take Combretum Micranthum with Guanethidine, Hydrochlorothiazide?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, taking Combretum micranthum leaf with antihypertensive drugs might increase the risk of hypotension.

Full Combretum Micranthum + Guanethidine, Hydrochlorothiazide answer

Can you take Conjugated Linoleic Acid (cla) with Guanethidine, Hydrochlorothiazide?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, taking CLA with antihypertensive drugs might increase the risk of hypotension.

Full Conjugated Linoleic Acid (cla) + Guanethidine, Hydrochlorothiazide answer

Can you take Coriander with Guanethidine, Hydrochlorothiazide?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, coriander might increase the risk of hypotension when taken with antihypertensive drugs.

Full Coriander + Guanethidine, Hydrochlorothiazide answer

Can you take Corn Silk with Guanethidine, Hydrochlorothiazide?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Taking corn silk extract with antihypertensive drugs might increase the risk of hypotension.

Full Corn Silk + Guanethidine, Hydrochlorothiazide answer

Can you take Corydalis Yanhusuo with Guanethidine, Hydrochlorothiazide?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, Corydalis yanhusuo might have additive effects with antihypertensive drugs.

Full Corydalis Yanhusuo + Guanethidine, Hydrochlorothiazide answer

Can you take Danshen with Guanethidine, Hydrochlorothiazide?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, taking danshen with antihypertensive drugs might increase the risk of hypotension.

Full Danshen + Guanethidine, Hydrochlorothiazide answer

Can you take Diindolylmethane with Guanethidine, Hydrochlorothiazide?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, diindolylmethane might increase the risk of hyponatremia if used with sodium-depleting diuretics.

Full Diindolylmethane + Guanethidine, Hydrochlorothiazide answer

Can you take European Barberry with Guanethidine, Hydrochlorothiazide?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, taking European barberry with antihypertensive drugs might increase the risk of hypotension.

Full European Barberry + Guanethidine, Hydrochlorothiazide answer

Can you take European Buckthorn with Guanethidine, Hydrochlorothiazide?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. European buckthorn has stimulant laxative effects.

Full European Buckthorn + Guanethidine, Hydrochlorothiazide answer

Can you take European Mistletoe with Guanethidine, Hydrochlorothiazide?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, European mistletoe might increase the risk of hypotension when taken with antihypertensive drugs.

Full European Mistletoe + Guanethidine, Hydrochlorothiazide answer

Can you take Fermented Milk with Guanethidine, Hydrochlorothiazide?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, fermented milk might increase the risk of hypotension when taken with antihypertensive drugs.

Full Fermented Milk + Guanethidine, Hydrochlorothiazide answer

Can you take Fig with Guanethidine, Hydrochlorothiazide?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, fig might increase the risk of photosensitivity when used in combination with photosensitizing drugs.

Full Fig + Guanethidine, Hydrochlorothiazide answer

Can you take Figwort with Guanethidine, Hydrochlorothiazide?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, overuse of figwort might compound diuretic-induced potassium loss.

Full Figwort + Guanethidine, Hydrochlorothiazide answer

Can you take Flaxseed with Guanethidine, Hydrochlorothiazide?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, flaxseed might have additive effects when used with antihypertensive drugs and increase the risk of hypotension.

Full Flaxseed + Guanethidine, Hydrochlorothiazide answer

Can you take Fo-ti with Guanethidine, Hydrochlorothiazide?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, fo-ti, particularly raw fo-ti root, might increase the risk of hypokalemia when taken with diuretic drugs.

Full Fo-ti + Guanethidine, Hydrochlorothiazide answer
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 entry links to a full report with the clinical detail, likelihood, evidence level, and citations for that exact combination.
  • Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

How Does Our Interaction Checker Work?

Behind every verdict on this page is a category system. Our source database doesn’t document supplement interactions drug-by-drug — it documents them against groups of medications that behave the same way (for example, “drugs processed by the CYP3A4 liver enzyme” or “blood-thinning medications”).

So the check works in three steps: (1) Guanethidine, Hydrochlorothiazide is classified into the pharmacology categories it belongs to, (2) every supplement interaction documented against any of those categories is inherited by Guanethidine, Hydrochlorothiazide, and (3) each ingredient keeps its own severity, likelihood, and evidence grades from the underlying record. That’s why one supplement can carry several records for one drug — it may interact through more than one category.

Guanethidine, Hydrochlorothiazide sits in 9 interaction categories. Open any one to see what the group means:

Antihypertensive Drugs 119 ingredients

Blood-pressure-lowering medications. Supplements that lower (or raise) blood pressure can amplify or fight these drugs.

119 of the supplement ingredients on this page reach Guanethidine, Hydrochlorothiazide through this category.

Diuretic Drugs 73 ingredients

Medications that increase fluid loss. Supplements affecting fluid or electrolytes (like potassium) can interact with them.

73 of the supplement ingredients on this page reach Guanethidine, Hydrochlorothiazide through this category.

Photosensitizing Drugs 20 ingredients

Medications that make skin more sun-sensitive. Supplements with the same property can compound it.

20 of the supplement ingredients on this page reach Guanethidine, Hydrochlorothiazide through this category.

Oral Drugs 17 ingredients

A pharmacology grouping from our source database: medications in this group share a property that certain supplements are known to interact with, so an interaction documented for the group applies to every drug in it.

17 of the supplement ingredients on this page reach Guanethidine, Hydrochlorothiazide through this category.

Nephrotoxic Drugs 6 ingredients

A pharmacology grouping from our source database: medications in this group share a property that certain supplements are known to interact with, so an interaction documented for the group applies to every drug in it.

6 of the supplement ingredients on this page reach Guanethidine, Hydrochlorothiazide through this category.

Thiazide Diuretics 5 ingredients

Medications that increase fluid loss. Supplements affecting fluid or electrolytes (like potassium) can interact with them.

5 of the supplement ingredients on this page reach Guanethidine, Hydrochlorothiazide through this category.

Organic Anion Transporter 1 (Oat1) Substrates 4 ingredients

A pharmacology grouping from our source database: medications in this group share a property that certain supplements are known to interact with, so an interaction documented for the group applies to every drug in it.

4 of the supplement ingredients on this page reach Guanethidine, Hydrochlorothiazide through this category.

Organic Anion Transporter 3 (Oat3) Substrates 4 ingredients

A pharmacology grouping from our source database: medications in this group share a property that certain supplements are known to interact with, so an interaction documented for the group applies to every drug in it.

4 of the supplement ingredients on this page reach Guanethidine, Hydrochlorothiazide through this category.

Guanethidine (Ismelin) 1 ingredient

A pharmacology grouping from our source database: medications in this group share a property that certain supplements are known to interact with, so an interaction documented for the group applies to every drug in it.

1 of the supplement ingredient on this page reaches Guanethidine, Hydrochlorothiazide through this category.

Related: does Guanethidine, Hydrochlorothiazide deplete any nutrients?

Guanethidine, Hydrochlorothiazide has 7 reported nutrient associations in the research literature — see the Guanethidine, Hydrochlorothiazide nutrient depletion report.

Check a real product

Take a Supplement Product? Check the Whole Bottle Against Guanethidine, Hydrochlorothiazide

Most supplements are combination products — and the interaction may come from an ingredient you didn’t buy it for. Search any product below (or scan its label) and we’ll check every ingredient on it against Guanethidine, Hydrochlorothiazide.

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Pharmacist Counseling Corner

Guanethidine, Hydrochlorothiazide & Supplements: Common Questions

What supplements interact with Guanethidine, Hydrochlorothiazide?
In our interaction database, 231 supplement and herbal ingredients have an interaction with Guanethidine, Hydrochlorothiazide on file — 10 rated major, 196 moderate, and 25 minor. That number sounds scarier than it is: severity matters far more than the count, which is why the list on this page is ranked instead of alphabetical. Start at the top. The highest-ranked right now: American Hellebore, Siberian Cocklebur, Tyramine.
Which Guanethidine, Hydrochlorothiazide supplement interactions are the most serious?
Focus on the major group: American Hellebore, Siberian Cocklebur, Tyramine, Activated Charcoal and American Mistletoe, among others. A major rating means the combination can be clinically significant, not that harm is guaranteed — but it's exactly the kind of thing to run past your pharmacist before your next dose, not after. Jump to the ranked list.
Can I take vitamins or supplements while on Guanethidine, Hydrochlorothiazide?
That depends entirely on which supplement. The honest answer for Guanethidine, Hydrochlorothiazide is in the ranked list above — and if what you take is a combination product with a dozen ingredients, don't check them one by one: photograph the label with our scanner and we'll check the whole thing at once. Try the label scanner or the interaction checker.
Do brands like Esimil have the same supplement interactions as Guanethidine, Hydrochlorothiazide?
Yes — Esimil all contain Guanethidine, Hydrochlorothiazide, so everything on this page applies to them equally. Interactions belong to the active drug, never to the brand on the box; the same is true of generics.
Where do these interaction ratings come from?
Every rating comes from the Natural Medicines database — the same evidence-graded reference pharmacists and hospitals use — and each interaction carries three separate grades: severity (how bad it can be), likelihood (how well it's documented in studies and case reports), and an evidence level. Our pharmacists review the content; we never let an AI decide an interaction. See how to read the ratings and our editorial policy.
Does Guanethidine, Hydrochlorothiazide deplete any vitamins or nutrients?
It might — Guanethidine, Hydrochlorothiazide has 7 reported nutrient-depletion associations in the research literature, which is a different question from interactions: instead of a supplement changing the drug, the drug may lower a nutrient over time. See the Guanethidine, Hydrochlorothiazide nutrient depletion report for the specifics and what to discuss with your pharmacist.
What about Guanethidine, Hydrochlorothiazide and my other medications?
This page covers Guanethidine, Hydrochlorothiazide against supplements and herbal ingredients. Checking Guanethidine, Hydrochlorothiazide against your other prescription or OTC medications is a different tool — our drug interaction checker covers that side. Head to the drug–drug interaction checker.

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

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Sourcing

Where This Data Comes From — and Why You Can Trust It

🧪 Licensed clinical database

Every interaction verdict on this page comes from Natural Medicines Pro (TRC Healthcare / Therapeutic Research) — the same evidence-graded reference used by pharmacists and hospitals. We license this data directly; we do not scrape it, and no AI invents an interaction.

🧑‍⚕️ Pharmacist review

This page is curated and coded by , Clinical Pharmacist, with additional analysis by the HelloPharmacist Pharmacist Team. Editorial commentary is ours; the licensed interaction records are shown as sourced.

🔄 Kept current

Our interaction database refreshes on a weekly cycle, and this page re-checks the live database every time it’s rebuilt — what you see reflects the database as of October 6, 2026.

🔍 Full transparency

How every dataset on this site is sourced, licensed, and updated is documented publicly: our data sources · editorial policy · how we use AI.

Educational information, not medical advice. An interaction being on file does not mean it will happen to you — and absence of one is not proof of safety. Never start or stop a medication or supplement without talking to your pharmacist or doctor.