Drug & supplement interaction

Cinchona + Amiloride, Hydrochlorothiazide

Amiloride, Hydrochlorothiazide brand names: Moduretic, Amilzide, Moduret 25, Amil-Co.

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 Cinchona and Amiloride, Hydrochlorothiazide 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. Additionally, although there is no interaction, the label for Amiloride, Hydrochlorothiazide states a food rule worth keeping to, and the two are separately associated with some of the same side effects, which would make a new symptom harder to attribute to one or the other.

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Interaction report

Cinchona and Amiloride, Hydrochlorothiazide

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 Amiloride, Hydrochlorothiazide and Cinchona 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.

Cinchona safety at a glance

Cinchona overall Use caution Contains quinine, which can cause serious side effects, and the bark is not dose-controlled.
Pregnancy Likely Unsafe When used orally. Cinchona is reported to have uterine stimulant and abortifacient activity, and to be fetotoxic and teratogenic, causing visual and auditory de... Read the full pregnancy detail
Breastfeeding Possibly Unsafe When used orally. The cinchona alkaloids quinine and quinidine are reported to be excreted in breast milk and may be toxic to infants. Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center) — the full detail is in the Special populations card below. Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Amiloride, Hydrochlorothiazide and Cinchona? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Amiloride, Hydrochlorothiazide

Interactions in our licensed database are recorded against drug classes, not just single drug names. Amiloride, Hydrochlorothiazide is filed under 10 classifications — including potassium-sparing diuretics, thiazide diuretics, diuretic drugs. Cinchona has documented interactions with 11 drug classes — the most serious being quinidine (major), quinine (major) and antacids (moderate) — and none of Amiloride, Hydrochlorothiazide’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

Cinchona Does Interact With Other Medications

Cinchona has 3 major, 473 moderate, 16 minor known drug interactions in our database — Amiloride, Hydrochlorothiazide isn’t one of them. If you take anything else, check it against the full list below.

Major 3 Moderate 473 Minor 16 No known interaction 2,338 (incl. Amiloride, Hydrochlorothiazide)
Taking anything else?

Check Another of Your Medications Against Cinchona

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

What to actually watch for

No Interaction Found — But Data Suggests Cinchona and Amiloride, Hydrochlorothiazide May Share Several of the Same Side Effects

This is not an interaction. Neither one changes how your body handles the other, and nothing here says they react together. What our sources do show is that each has separately been linked to the effects below — so taking both can make those effects more likely to turn up, and harder to pin on one or the other if they do. 7 of them are worth acting on rather than waiting out — marked below.

  • An irregular heartbeat Worth acting on Additional detail

    Cinchona

    “Cinchona contains the alkaloids quinidine and quinine that can prolong the QT interval on the electrocardiogram, and cause potentially fatal cardiac arrhythmias such as torsades de pointes”

    Cinchona · Natural Medicines adverse-effect record, reported in arrhythmia.

    2 sources cited
    1. 3046. Hansten PD, Horn JR. Drug Interactions Analysis and Management. Vancouver, WA: Applied Therapeutics Inc., 1997 and updates.
    2. 93232. US Food and Drug Administration notice: Drug products containing quinine - enforcement action dates. Docket # 2006N-0476. Federal Register 2006 (December 15);71 (241): 75557-60.

    Amiloride, Hydrochlorothiazide

    Listed in the ADVERSE REACTIONS section of the FDA label for Amiloride, Hydrochlorothiazide. Read the label on DailyMed ›

  • Confusion Worth acting on Additional detail

    Cinchona

    “Orally, prolonged use of high doses of cinchona or its alkaloids, or a single dose of 3 grams or more of the alkaloid quinine are associated with a toxicity syndrome known as cinchonism. Symptoms include headache, dizziness, nausea and vomiting, diarrhea, hemolysis, hypotension, cardiac arrhythmias, tinnitus, deafness, vision changes, blindness, abdominal pain, delirium, convulsions, paralysis, and collapse (6,12,19,…”

    Cinchona · Natural Medicines adverse-effect record, reported in arrhythmia.

    6 sources cited
    1. 6. The Review of Natural Products by Facts and Comparisons. St. Louis, MO: Wolters Kluwer Co., 1999.
    2. 12. McGuffin M, Hobbs C, Upton R, Goldberg A, eds. American Herbal Products Association's Botanical Safety Handbook. Boca Raton, FL: CRC Press, LLC 1997.
    3. 19. Brinker F. Herb Contraindications and Drug Interactions. 2nd ed. Sandy, OR: Eclectic Medical Publications, 1998.
    4. 505. Hardman JG, Limbird LL, Molinoff PB, eds. Goodman and Gillman's The Pharmacological Basis of Therapeutics, 9th ed. New York, NY: McGraw-Hill, 1996.
    5. 93232. US Food and Drug Administration notice: Drug products containing quinine - enforcement action dates. Docket # 2006N-0476. Federal Register 2006 (December 15);71 (241): 75557-60.
    6. 18. Gruenwald J, Brendler T, Jaenicke C. PDR for Herbal Medicines. 1st ed. Montvale, NJ: Medical Economics Company, Inc., 1998.

    Amiloride, Hydrochlorothiazide

    Listed in the ADVERSE REACTIONS section of the FDA label for Amiloride, Hydrochlorothiazide. Read the label on DailyMed ›

  • A low platelet count / Kidney problems / Anemia Worth acting on Additional detail

    Cinchona

    “Quinine, which is present in cinchona, has been associated with serious, sometimes fatal, hematological disorders including thrombocytopenia, thrombotic thrombocytopenic purpura (TTP), and hemolytic uremic syndrome (hemolytic anemia, acute renal failure, and thrombocytopenia). Initial symptoms may include bleeding from the gums, nose or gastrointestinal tract, easy bruising, and petechiae.”

    Cinchona · Natural Medicines adverse-effect record, reported in anemia.

    3 sources cited
    1. 93232. US Food and Drug Administration notice: Drug products containing quinine - enforcement action dates. Docket # 2006N-0476. Federal Register 2006 (December 15);71 (241): 75557-60.
    2. 93233. FDA Drug Safety Communication: New risk management plan and patient medication guide for Qualaquin (quinine sulfate). 07-08-2010. https://www.fda.gov/Drugs/DrugSafety/PostmarketDrugSafetyInformationforPatientsandProviders/ucm218202 (accessed 02/18/17).
    3. 505. Hardman JG, Limbird LL, Molinoff PB, eds. Goodman and Gillman's The Pharmacological Basis of Therapeutics, 9th ed. New York, NY: McGraw-Hill, 1996.

    Amiloride, Hydrochlorothiazide

    Listed in the ADVERSE REACTIONS section of the FDA label for Amiloride, Hydrochlorothiazide. Read the label on DailyMed ›

  • Hives Worth acting on Additional detail

    Cinchona

    Recorded for Cinchona in the same Natural Medicines adverse-effect record shown under An irregular heartbeat above.

    Amiloride, Hydrochlorothiazide

    Listed in the ADVERSE REACTIONS section of the FDA label for Amiloride, Hydrochlorothiazide. Read the label on DailyMed ›

  • Bleeding or bruising Worth acting on Additional detail

    Cinchona

    Recorded for Cinchona in the same Natural Medicines adverse-effect record shown under An irregular heartbeat above.

    Amiloride, Hydrochlorothiazide

    Listed in the ADVERSE REACTIONS section of the FDA label for Amiloride, Hydrochlorothiazide. Read the label on DailyMed ›

  • Ringing in the ears / Blurred vision Additional detail

    Cinchona

    “Cinchona contains quinine that can cause dose-related adverse effects on hearing and vision, including tinnitus, deafness, vision changes, and blindness (6,8,12,93232).”

    Cinchona · Natural Medicines adverse-effect record, reported in tinnitus.

    4 sources cited
    1. 6. The Review of Natural Products by Facts and Comparisons. St. Louis, MO: Wolters Kluwer Co., 1999.
    2. 8. Wichtl MW. Herbal Drugs and Phytopharmaceuticals. Ed. N.M. Bisset. Stuttgart: Medpharm GmbH Scientific Publishers, 1994.
    3. 12. McGuffin M, Hobbs C, Upton R, Goldberg A, eds. American Herbal Products Association's Botanical Safety Handbook. Boca Raton, FL: CRC Press, LLC 1997.
    4. 93232. US Food and Drug Administration notice: Drug products containing quinine - enforcement action dates. Docket # 2006N-0476. Federal Register 2006 (December 15);71 (241): 75557-60.

    Amiloride, Hydrochlorothiazide

    Listed in the ADVERSE REACTIONS section of the FDA label for Amiloride, Hydrochlorothiazide. Read the label on DailyMed ›

  • Low blood pressure Additional detail

    Cinchona

    Recorded for Cinchona in the same Natural Medicines adverse-effect record shown under Confusion above.

    Amiloride, Hydrochlorothiazide

    Listed in the ADVERSE REACTIONS section of the FDA label for Amiloride, Hydrochlorothiazide. Read the label on DailyMed ›

Showing the 10 most notable of 19 shared effects — ranked by how unusual each one is, not just whether both lists mention it.

Reported for Cinchona but not commonly for Amiloride, Hydrochlorothiazide: seizures, loss of vision and hearing loss.

Effects for Amiloride, Hydrochlorothiazide come from the ADVERSE REACTIONS section of its FDA label; effects for Cinchona come from the Natural Medicines adverse-effect record, quoted above. Wording is matched across sources by our own clinical vocabulary, so treat this as a prompt to pay attention, not a diagnosis.

Special populations

Cinchona in Pregnancy & Breastfeeding

Pregnancy Likely Unsafe

When used orally. Cinchona is reported to have uterine stimulant and abortifacient activity, and to be fetotoxic and teratogenic, causing visual and auditory defects. Avoid using.

Lactation Possibly Unsafe

When used orally. The cinchona alkaloids quinine and quinidine are reported to be excreted in breast milk and may be toxic to infants.

DISCLAIMER: This tool is intended for informational purposes only, and should not be interpreted as specific medical advice. Patients should consult with a qualified healthcare provider before making decisions about therapies and/or health conditions.© 2026 Therapeutic Research Center

How to take them

Some Amiloride, Hydrochlorothiazide Products Have a Food Rule — Cinchona Should Not Break It

At least one FDA label for a product containing Amiloride, Hydrochlorothiazide says to take it with food. If you take Cinchona on an empty stomach out of habit, keep them separate — and take Amiloride, Hydrochlorothiazide with a meal where the label says to.

This may not be true of your version. Food instructions belong to the product, not the ingredient: two Amiloride, Hydrochlorothiazide products can carry different directions, and extended-release forms often differ from immediate-release ones. The label we read is quoted below — check the directions on your own box or bottle, or ask your pharmacist, for how to take the exact product you were given.

DOSAGE AND ADMINISTRATION Amiloride hydrochloride and hydrochlorothiazide tablets should be administered with food.

From the Dosage and Administration section of the FDA label we read for Amiloride, Hydrochlorothiazide — where that label names a specific product, the instruction is that product's. Read the label on DailyMed ›

A food rule is not an interaction — it is about how much of the medicine you absorb. The directions that came with your own product, and your pharmacist, outrank anything on this page.

Everything else you take

See Every Supplement That Interacts With Amiloride, Hydrochlorothiazide

This page covers Cinchona only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Amiloride, Hydrochlorothiazide page lists 236 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), Asarabacca (major) and Dolomite (major).

By severity: 10 major · 199 moderate · 27 minor.

From our pharmacist’s overview on the Amiloride, Hydrochlorothiazide page

“The typical Moduretic (amiloride with hydrochlorothiazide) patient is managing blood pressure long term, and the supplements that crowd reaches for (herbal blood pressure aids, potassium, calcium) are exactly what fills this list. It deserves a careful read, not a skim.”

Reviewed by 2 · Jul 18, 2026

Open the Amiloride, Hydrochlorothiazide interaction page

One more smart check

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

We hold 12 real supplement products containing Cinchona, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Cinchona. Even though Cinchona itself has no known interaction with Amiloride, Hydrochlorothiazide, 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 Cinchona and Amiloride, Hydrochlorothiazide 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 Cinchona
Steady interest

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

29 days ago today
Medication Amiloride, Hydrochlorothiazide
Top 25%

#326 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 Cinchona reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Cinchona and Amiloride, Hydrochlorothiazide records this page draws on were last updated July 11, 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 Cinchona

What is Cinchona?

Cinchona
  • Malaria (historical/traditional)
  • Fever
  • Leg cramps and restless legs
  • Digestive upset and loss of appetite
  • Bitter tonic

Cinchona bark is the natural source of quinine and has been used for centuries to treat malaria and fever, but the bark itself is not standardized and can be unpredictable and risky. Modern medicine uses purified, dose-controlled quinine instead, and the supplement form carries real dangers, including serious heart and blood problems. Talk to a pharmacist or doctor before using it, and avoid it during pregnancy.

Cinchona officinalis · Rubiaceae · Bark · Dried bark, tinctures, liquid extracts, capsules, teas, and as a bitter flavoring in tonic water

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

Cinchona: dosing

There is no well-established safe dose for cinchona bark as a supplement. The amount of quinine and other alkaloids can vary a lot from product to product, which makes safe dosing difficult.If you are considering a cinchona product, follow the directions on the label and do not exceed them.

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

Read the full Cinchona monograph & all interactions
Medication

About Amiloride and Hydrochlorothiazide

What Is Amiloride and Hydrochlorothiazide Used For?

Brand names: Moduretic, Amilzide, Moduret 25, Amil-Co

Amiloride hydrochloride and hydrochlorothiazide tablets are used for patients with high blood pressure (hypertension) or congestive heart failure who tend to develop low potassium (hypokalemia) when taking a thiazide or other diuretic alone — or for whom keeping potassium levels in a normal range is especially important, such as people taking digoxin or those with significant heart rhythm problems.

The tablets may be used on their own or alongside other blood pressure medicines, such as methyldopa or beta blockers. This combination product is not intended as the first-choice treatment for swelling (edema) or high blood pressure unless low potassium is a specific concern.

See full Amiloride and Hydrochlorothiazide drug information
Keep checking

Other Drugs & Cinchona

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

3Major
473Moderate
16Minor
2,337No known interaction
3 Major 473 Moderate 16 Minor 2,337 No interaction
Major

3 interactions

Moderate

473 interactions

Showing 60 of 473 moderate interactions — see all 473 on the Cinchona page.

Minor

16 interactions

No interaction 2,337 drugs checked — show the list

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

Showing the 60 most looked-up of 2,337 medications checked with no known interaction — see the full Cinchona list.

See the full Cinchona interactions page
See every supplement checked against Amiloride, Hydrochlorothiazide, ranked by severity
Evidence & sources

Cinchona References

The 15 references that drive our Cinchona 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. The Review of Natural Products by Facts and Comparisons. St. Louis, MO: Wolters Kluwer Co., 1999.
  2. Wichtl MW. Herbal Drugs and Phytopharmaceuticals. Ed. N.M. Bisset. Stuttgart: Medpharm GmbH Scientific Publishers, 1994.
  3. Leung AY, Foster S. Encyclopedia of Common Natural Ingredients Used in Food, Drugs and Cosmetics. 2nd ed. New York, NY: John Wiley & Sons, 1996.
  4. McGuffin M, Hobbs C, Upton R, Goldberg A, eds. American Herbal Products Association's Botanical Safety Handbook. Boca Raton, FL: CRC Press, LLC 1997.
  5. Gruenwald J, Brendler T, Jaenicke C. PDR for Herbal Medicines. 1st ed. Montvale, NJ: Medical Economics Company, Inc., 1998.
  6. Brinker F. Herb Contraindications and Drug Interactions. 2nd ed. Sandy, OR: Eclectic Medical Publications, 1998.
  7. Holt GA. Food & Possible Interactions with Drugs: Revised and Expanded Ed. Chicago, IL: Precept Press, 1998.
  8. Hardman JG, Limbird LL, Molinoff PB, eds. Goodman and Gillman's The Pharmacological Basis of Therapeutics, 9th ed. New York, NY: McGraw-Hill, 1996.
  9. Hansten PD, Horn JR. Drug Interactions Analysis and Management. Vancouver, WA: Applied Therapeutics Inc., 1997 and updates.
  10. Amabeoku GJ, Chikuni O, Akino C, Mutetwa S. Pharmacokinetic interaction of single doses of quinine and carbamazepine, phenobarbitone and phenytoin in healthy volunteers. East Afr Med J 1993;70:90-3.
  11. Shah BH, Nawaz Z, Virani SS, Ali IQ, Saeed SA, Gilani AH.The inhibitory effect of cinchonine on human platelet aggregation due to blockade of calcium influx. Biochem Pharmacol 1998;56:955-60. PubMed
  12. US Food and Drug Administration notice: Drug products containing quinine - enforcement action dates. Docket # 2006N-0476. Federal Register 2006 (December 15);71 (241): 75557-60.
  13. FDA Drug Safety Communication: New risk management plan and patient medication guide for Qualaquin (quinine sulfate). 07-08-2010. https://www.fda.gov/Drugs/DrugSafety/PostmarketDrugSafetyInformationforPatientsandProviders/ucm218202 (accessed 02/18/17).
  14. Dooms-Goossens A, Deveylder H, Duron C, et al. Airborne contact urticaria due to cinchona. Contact Dermatitis 1986;15(4):258. PubMed
  15. Bramer SL, Suri A. Inhibition of CYP2D6 by quinidine and its effects on the metabolism of cilostazol. Clin Pharmacokinet. 1999;37 Suppl 2:41-51. PubMed

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 Cinchona and Amiloride, Hydrochlorothiazide Together: Common Questions

Is it safe to take Cinchona with Amiloride, Hydrochlorothiazide?
We do not list a known interaction between Cinchona and Amiloride, Hydrochlorothiazide. 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.
Do Cinchona and Amiloride, Hydrochlorothiazide have any of the same side effects?
Yes — our sources link each of them separately to 10 of the same effects. That is not an interaction: neither changes how your body handles the other. It does mean that if one of those effects turns up, it can be harder to tell which one is behind it. They are listed on this page with the source behind each.
Should I take Cinchona and Amiloride, Hydrochlorothiazide at the same time of day?
At least one FDA label for a product containing Amiloride, Hydrochlorothiazide says to take it with food. If you take Cinchona on an empty stomach out of habit, keep them separate and take Amiloride, Hydrochlorothiazide with a meal where the label says to. Food instructions belong to the product rather than the ingredient — two Amiloride, Hydrochlorothiazide products can differ — so check the directions on your own box. This is about absorption, not an interaction.
How was the Cinchona and Amiloride, Hydrochlorothiazide combination checked?
Interactions in our licensed database are recorded against drug classes. Amiloride, Hydrochlorothiazide is filed under 10 classifications, and Cinchona has documented interactions with 11 drug classes — none of Amiloride, Hydrochlorothiazide'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 Cinchona interact with any other medications?
Yes. Cinchona has 492 documented drug interactions in our database — Amiloride, Hydrochlorothiazide 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 Amiloride, Hydrochlorothiazide interact with any supplements?
Yes. Amiloride, Hydrochlorothiazide has documented interactions with 236 supplements in our database — Cinchona is not one of them. The Amiloride, Hydrochlorothiazide 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

Cinchona monograph Uses, safety profile, and every drug interaction in one place Amiloride and Hydrochlorothiazide drug information The full plain-English guide to this medication Amiloride, Hydrochlorothiazide supplement interactions Every supplement checked against Amiloride, Hydrochlorothiazide, 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 15 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Amiloride, Hydrochlorothiazide and Cinchona?

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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.