Drug & supplement interaction

Hydrangea + Phenazopyridine, Sulfisoxazole

Phenazopyridine, Sulfisoxazole brand name: Azo-Gantrisin.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Sep 13, 2026
The bottom line No known interaction

We found no known interaction between Hydrangea and Phenazopyridine, Sulfisoxazole in our sources. Absence of a documented interaction is not the same as proven safety, and does not guarantee one does not exist. Do not start, stop, or change a medication or supplement based on this page; confirm with your pharmacist or doctor first.

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Interaction report

Hydrangea and Phenazopyridine, Sulfisoxazole

We checked these two against our interaction database. Here is what we found.

No Known Interaction Found

We did not find a documented interaction between Phenazopyridine, Sulfisoxazole and Hydrangea in our sources. This does not guarantee that the combination is completely free of risk — there is often limited research on supplements and herbal products, especially around drug interactions.

If you decide to take both, the practical routine is simple: add one new thing at a time and note the date you started it. If the combination is going to disagree with you, it usually shows in the first days to a couple of weeks — and a start date turns “I’ve been feeling off” into something a pharmacist can actually work with. Do not stop a prescribed medicine on your own.

Always talk with your pharmacist or doctor before making changes to your medications or supplements, particularly if you take several medications or have an ongoing health condition.

Hydrangea safety at a glance

Hydrangea overall Use caution Human safety data are limited, and large or prolonged doses may cause unwanted effects.
Pregnancy Avoid Not enough safety information exists, so it is best avoided during pregnancy.
Breastfeeding Avoid There is no reliable safety data, so avoid use while breastfeeding.

Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Phenazopyridine, Sulfisoxazole and Hydrangea? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Phenazopyridine, Sulfisoxazole

Interactions in our licensed database are recorded against drug classes, not just single drug names. Phenazopyridine, Sulfisoxazole is filed under 4 classifications — including sulfonamide antibiotics, antibiotic drugs, photosensitizing drugs. Hydrangea has documented interactions with 1 drug class — the most serious being lithium (moderate) — and none of Phenazopyridine, Sulfisoxazole’s classifications are among them.

Classification data comes from our licensed Natural Medicines dataset. A medication can belong to classes beyond those recorded there, so this describes how the check was run — it is not a safety guarantee.

Keep it in perspective

Hydrangea Does Interact With Other Medications

Hydrangea has 1 moderate known drug interaction in our database — Phenazopyridine, Sulfisoxazole isn’t one of them. If you take anything else, check it against the full list below.

Moderate 1 No known interaction 2,829 (incl. Phenazopyridine, Sulfisoxazole)
Taking anything else?

Check Another of Your Medications Against Hydrangea

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

What to actually watch for

What Hydrangea Itself Has Been Linked To

This is not an interaction — nothing below involves Phenazopyridine, Sulfisoxazole. It is the side-effect record for Hydrangea on its own, from the licensed Natural Medicines monograph. If something new turns up after you add Hydrangea, this list is the first place to look.

  • Dizziness Additional detail

    “Orally, hydrangea may cause gastroenteritis, dizziness, and a feeling of tightness in the chest (4).”

    Hydrangea · Natural Medicines adverse-effect record, reported in vertigo.

    1 source cited
    1. 4. Newall CA, Anderson LA, Philpson JD. Herbal Medicine: A Guide for Healthcare Professionals. London, UK: The Pharmaceutical Press, 1996.

    “Orally, hydrangea may cause dizziness (4).”

    Hydrangea · Natural Medicines adverse-effect record, reported in vertigo.

    1 source cited
    1. 4. Newall CA, Anderson LA, Philpson JD. Herbal Medicine: A Guide for Healthcare Professionals. London, UK: The Pharmaceutical Press, 1996.

Everything above comes from the Natural Medicines adverse-effect record for Hydrangea — expand a row for the licensed statement it rests on. We haven’t matched Phenazopyridine, Sulfisoxazole to its FDA label in our system yet, so we can’t compare its own side-effect list here — the leaflet that comes with your prescription is the authoritative list for Phenazopyridine, Sulfisoxazole.

Everything else you take

See Every Supplement That Interacts With Phenazopyridine, Sulfisoxazole

This page covers Hydrangea only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Phenazopyridine, Sulfisoxazole page lists 68 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Para-aminobenzoic Acid (paba) (major), Alfalfa (moderate), Angelica Archangelica (moderate) and Arrach (moderate).

By severity: 2 major · 55 moderate · 11 minor.

From our pharmacist’s overview on the Phenazopyridine, Sulfisoxazole page

“Azo-Gantrisin pairs sulfisoxazole, a sulfa antibiotic, with phenazopyridine to ease urinary pain, and I'd want anyone taking it to pause before adding supplements. Two of the 68 ingredients on file rate major, and both can undercut the treatment itself: PABA feeds bacteria the raw material the sulfa drug is built to block, and activate…”

Reviewed by 2 · Jul 18, 2026

Open the Phenazopyridine, Sulfisoxazole interaction page

One more smart check

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

We hold 337 real supplement products containing Hydrangea, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Hydrangea. Even though Hydrangea itself has no known interaction with Phenazopyridine, Sulfisoxazole, another ingredient on your label might. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Hydrangea and Phenazopyridine, Sulfisoxazole 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 Hydrangea
Top 25%

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

29 days ago today
Medication Phenazopyridine, Sulfisoxazole
Steady interest

#1,791 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.

Where does our data come from?
  • Source: the Natural Medicines (TRC Healthcare) clinical database — the evidence-graded professional reference for herb & supplement interactions.
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Hydrangea reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Hydrangea and Phenazopyridine, Sulfisoxazole records this page draws on were last updated July 10, 2026.
  • What “no known interaction” means: no documented interaction in the sources above — not a guarantee of safety. Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more.
Data structure & sourcing designed and verified by .
Supplement

About Hydrangea

What is Hydrangea?

  • Kidney and bladder stones
  • Urinary tract complaints
  • Enlarged prostate symptoms
  • Mild diuretic (increasing urine)
  • Bladder infections (traditional use)

Hydrangea root has a long history in folk medicine, mainly for urinary and kidney stone complaints, but there is very little modern human research to confirm it works for any condition. Because safety data are limited and large amounts may be harmful, it is best to talk with a pharmacist or doctor before using it.

Hydrangea arborescens · Hydrangeaceae · Root and rhizome (underground stem) · Dried root, tincture, liquid extract, capsules, tea

An interaction check asks whether these two react with each other — it does not ask whether Hydrangea is a good idea for someone in your situation. Here is what our Hydrangea record says about it on its own.

Hydrangea: dosing

There is no well-established or standardized dose for hydrangea, because it has not been studied carefully in people. Traditional preparations used the dried root as a tea or tincture, but reliable, specific amounts are not available.If you choose to use a product, follow the directions on the label and do not exceed them.

From our Hydrangea monograph — the full record covers uses, side effects and every documented interaction.

Read the full Hydrangea monograph & all interactions
Keep checking

Other Drugs & Hydrangea

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

0Major
1Moderate
0Minor
2,828No known interaction
1 Moderate 2,828 No interaction
Moderate

1 interaction

No interaction 2,828 drugs checked — show the list

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

Showing the 60 most looked-up of 2,828 medications checked with no known interaction — see the full Hydrangea list.

See the full Hydrangea interactions page
See every supplement checked against Phenazopyridine, Sulfisoxazole, ranked by severity
Evidence & sources

Hydrangea References

The 1 references that drive our Hydrangea monograph and interaction data, from the evidence-graded Natural Medicines (TRC Healthcare) database. Citations with a link open the study on PubMed or the publisher’s site.

  1. Newall CA, Anderson LA, Philpson JD. Herbal Medicine: A Guide for Healthcare Professionals. London, UK: The Pharmaceutical Press, 1996.

Medication overviews come from MedlinePlus (NIH); supplement label data from the NIH Dietary Supplement Label Database. Content is written and reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

Pharmacist Counseling Corner

Taking Hydrangea and Phenazopyridine, Sulfisoxazole Together: Common Questions

Is it safe to take Hydrangea with Phenazopyridine, Sulfisoxazole?
We do not list a known interaction between Hydrangea and Phenazopyridine, Sulfisoxazole. That does not guarantee the combination is risk-free, so confirm with your pharmacist or doctor — especially if you take other medications or have a health condition.
How was the Hydrangea and Phenazopyridine, Sulfisoxazole combination checked?
Interactions in our licensed database are recorded against drug classes. Phenazopyridine, Sulfisoxazole is filed under 4 classifications, and Hydrangea has documented interactions with 1 drug class — none of Phenazopyridine, Sulfisoxazole's classifications are among them. A medication can belong to classes beyond those recorded in our dataset, so this describes how the check was run rather than guaranteeing safety.
Does Hydrangea interact with any other medications?
Yes. Hydrangea has 1 documented drug interaction in our database — Phenazopyridine, Sulfisoxazole is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.
Does Phenazopyridine, Sulfisoxazole interact with any supplements?
Yes. Phenazopyridine, Sulfisoxazole has documented interactions with 68 supplements in our database — Hydrangea is not one of them. The Phenazopyridine, Sulfisoxazole interaction page linked on this page lists every one, ranked by severity.

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

Where next

Keep Exploring

Hydrangea monograph Uses, safety profile, and every drug interaction in one place Phenazopyridine, Sulfisoxazole supplement interactions Every supplement checked against Phenazopyridine, Sulfisoxazole, 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 References The 1 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Phenazopyridine, Sulfisoxazole and Hydrangea?

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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.