Drug & supplement interaction

Fluoride + Duloxetine

Duloxetine brand names: Cymbalta, Drizalma Sprinkle, Irenka.

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 Fluoride and Duloxetine 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 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

Fluoride and Duloxetine

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 Duloxetine and Fluoride 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.

Worth understanding: our licensed dataset holds no drug-interaction record for Fluoride at all — not against Duloxetine, and not against any other medication we track. This verdict therefore rests on the absence of any recorded data, not on research that looked at this combination and found nothing. We cannot rule an interaction out.

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.

Fluoride safety at a glance

Fluoride overall Use caution Safe at recommended dental doses, but excess can cause fluorosis and other harm.
Pregnancy Likely Safe When used orally and appropriately. Elemental fluoride is safe when used in doses below the tolerable upper intake level (UL) of 10 mg daily. Although fluoridat... Read the full pregnancy detail
Breastfeeding Likely Safe When used orally and appropriately. Elemental fluoride is safe when used in doses below the tolerable upper intake level (UL) of 10 mg daily. Although fluoridat... 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 Duloxetine and Fluoride? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

No Interaction Found — But Data Suggests Fluoride and Duloxetine 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. One of them is worth acting on rather than waiting out — marked below.

  • Bleeding or bruising Worth acting on Additional detail

    Fluoride

    “Orally, fluoride can cause gastrointestinal symptoms. Enteric-coated and sustained-release dosage forms of sodium phosphate and sodium monofluorophosphate may cause fewer adverse effects than plain sodium fluoride. Adverse effects appear to be dose related. Sodium fluoride at high daily doses of 40-65 mg can cause nausea, vomiting, and GI bleeding (15,9127).”

    Fluoride · Natural Medicines adverse-effect record, reported in myasthenia gravis.

    4 sources cited
    1. 94405. Grey A, Garg S, Dray M, Purvis L, Horne A, Callon K, Gamble G, Bolland M, Reid IR, Cundy T. Low-dose fluoride in postmenopausal women: a randomized controlled trial. J Clin Endocrinol Metab. 2013 Jun;98(6):2301-7. PubMed
    2. 9127. Brown JP, Josse RG, et al. 2002 clinical practice guidelines for the diagnosis and management of osteoporosis in Canada. CMAJ 2002;167:S1-S34..
    3. 9129. Haguenauer D, Welch V, Shea B, et al. Fluoride for treating postmenopausal osteoporosis.(Cochrane Review). Cochrane Database Syst Rev 2002;(4):CD002825.. PubMed
    4. 15. McEvoy GK, ed. AHFS Drug Information. Bethesda, MD: American Society of Health-System Pharmacists, 1998.

    Duloxetine

    Listed in the ADVERSE REACTIONS section of the FDA label for Duloxetine. Read the label on DailyMed ›

  • Vomiting / Nausea Additional detail

    Fluoride

    Recorded for Fluoride in the same Natural Medicines adverse-effect record shown under Bleeding or bruising above.

    Duloxetine

    Listed in the ADVERSE REACTIONS section of the FDA label for Duloxetine. Read the label on DailyMed ›

Reported for Fluoride but not commonly for Duloxetine: a severe skin reaction, a change in thyroid levels, an allergic reaction and joint or muscle stiffness.

Effects for Duloxetine come from the ADVERSE REACTIONS section of its FDA label; effects for Fluoride 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

Fluoride in Pregnancy & Breastfeeding

Pregnancy And Lactation Likely Safe

When used orally and appropriately. Elemental fluoride is safe when used in doses below the tolerable upper intake level (UL) of 10 mg daily. Although fluoridated water has been consumed during pregnancy with apparent safety for many years, some population research suggests that more information is needed to determine a safe level of fluoride exposure for those living in regions with fluoridated water. Some emerging population research suggests that increased urinary fluoride levels during pregnancy might be associated with negative cognitive effects in the infant. However, more information is needed to determine if these results are clinically significant at the population level, as well as whether these effects are due to fluoride or to confounding factors such as socioeconomic status, use of formula instead of breast-feeding, lifestyle factors present during pregnancy, other regional environmental exposures, or the choice of IQ tests used in studies. ...when used topically and appropriately. Fluoride is safe in quantities typically found in toothpastes, mouth rinses, and professionally applied fluoride dental treatments.

Pregnancy And Lactation Possibly Unsafe

When used orally at doses above the tolerable upper intake level (UL) of 10 mg daily of elemental fluoride for prolonged periods. Long-term exposure to high doses can cause skeletal fluorosis, but pregnancy or lactation doesn't seem to affect susceptibility to skeletal fluorosis.

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

From our Q&A

Questions About Fluoride or Duloxetine

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Fluoride or Duloxetine, not necessarily both, but if one is close to what you were about to ask it will usually go further than a database entry can:

Not quite your question? Ask our pharmacists directly — it is free, there is no account required, and answers usually come back within 24 hours.

Everything else you take

See Every Supplement That Interacts With Duloxetine

This page covers Fluoride only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Duloxetine page lists 132 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Beer (major), Lithium (major), Siberian Cocklebur (major) and Wine (major).

By severity: 5 major · 107 moderate · 20 minor.

Open the Duloxetine interaction page

One more smart check

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

We hold 61 real supplement products containing Fluoride, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Fluoride. Even though Fluoride itself has no known interaction with Duloxetine, 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 Fluoride and Duloxetine 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 Fluoride
Top half

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

29 days ago today
Medication Duloxetine
Top 5%

#47 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 Fluoride reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Fluoride and Duloxetine 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 Fluoride

What is Fluoride?

  • Preventing tooth decay (cavities)
  • Strengthening tooth enamel
  • Dental care for children in low-fluoride areas
  • Bone health support

Fluoride is a mineral best known for preventing cavities and strengthening tooth enamel, and it is widely used in toothpaste, mouth rinses, and community water. Supplements (drops or tablets) are sometimes prescribed for children in areas without fluoridated water, but they should be used only under professional guidance because too much fluoride can harm teeth and bones. Always check with your dentist, doctor, or pharmacist before giving fluoride supplements.

Mineral (fluoride ion) · Tablets, lozenges, drops, mouth rinses, toothpaste, varnish, fluoridated water, and combination supplements

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

Fluoride: dosing

There is no single supplement dose that fits everyone. The amount of fluoride a person needs depends on their age and how much fluoride is already in their drinking water. Because of this, fluoride supplement dosing for children is decided by a dentist or doctor.For everyday use, follow the directions on your toothpaste or mouth rinse label, and use only a small (pea-sized or smaller) amount of toothpaste for young children.

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

Read the full Fluoride monograph & all interactions
Medication

About Duloxetine

What Is Duloxetine Used For?

Brand names: Cymbalta, Drizalma Sprinkle, Irenka

Duloxetine delayed-release capsules treat major depressive disorder (MDD) and generalized anxiety disorder (GAD) in adults. They also manage diabetic peripheral neuropathic pain (nerve pain from diabetes), fibromyalgia, and chronic musculoskeletal pain (such as chronic low back pain and pain from osteoarthritis) in adults.

GAD is also approved in pediatric patients 7 years and older for Cymbalta, Drizalma Sprinkle, and certain duloxetine delayed-release capsule products. Fibromyalgia is approved in patients 13 years and older for Cymbalta and some duloxetine delayed-release capsule products. Age-specific approvals vary by product — follow your prescriber's guidance on which product is right for your age group.

See full Duloxetine drug information
Keep checking

Other Drugs & Fluoride

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

0Major
0Moderate
0Minor
2,829No known interaction
2,829 No interaction
No interaction 2,829 drugs checked — show the list

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

Showing the 60 most looked-up of 2,829 medications checked with no known interaction — see the full Fluoride list.

See the full Fluoride interactions page
See every supplement checked against Duloxetine, ranked by severity
Evidence & sources

Fluoride References

The 39 references that drive our Fluoride 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. McEvoy GK, ed. AHFS Drug Information. Bethesda, MD: American Society of Health-System Pharmacists, 1998.
  2. Food and Nutrition Board, Institute of Medicine. Dietary Reference Intakes for Calcium, Phosphorus, Magnesium, Vitamin D, and Fluoride. Washington, DC: National Academy Press, 1999. Available at: http://books.nap.edu/books/0309063507/html/index.html.
  3. Position of the American Dietetic Association: the impact of fluoride on health. J Am Diet Assoc 2001;101:126-32.. PubMed
  4. Brown JP, Josse RG, et al. 2002 clinical practice guidelines for the diagnosis and management of osteoporosis in Canada. CMAJ 2002;167:S1-S34..
  5. Haguenauer D, Welch V, Shea B, et al. Fluoride for treating postmenopausal osteoporosis.(Cochrane Review). Cochrane Database Syst Rev 2002;(4):CD002825.. PubMed
  6. Choi AL, Sun G, Zhang Y, Grandjean P. Developmental fluoride neurotoxicity: a systematic review and meta-analysis. Environ Health Perspect. 2012 Oct;120(10):1362-8. PubMed
  7. Enamandram M, Das S, Chaney KS. Cheilitis and urticaria associated with stannous fluoride in toothpaste. J Am Acad Dermatol. 2014 Sep;71(3):e75-6. PubMed
  8. Foti C, Romita P, Ficco D, Bonamonte D, Angelini G. Allergic contact cheilitis to amine fluoride in a toothpaste. Dermatitis. 2014 Jul-Aug;25(4):209. PubMed
  9. Grey A, Garg S, Dray M, Purvis L, Horne A, Callon K, Gamble G, Bolland M, Reid IR, Cundy T. Low-dose fluoride in postmenopausal women: a randomized controlled trial. J Clin Endocrinol Metab. 2013 Jun;98(6):2301-7. PubMed
  10. Peters P, Drummond C. Perioral dermatitis from high fluoride dentifrice: a case report and review of literature. Aust Dent J. 2013 Sep;58(3):371-2. PubMed
  11. Sälzer S, Slot DE, Dörfer CE, Van der Weijden GA. Comparison of triclosan and stannous fluoride dentifrices on parameters of gingival inflammation and plaque scores: a systematic review and meta-analysis. Int J Dent Hyg. 2015 Feb;13(1):1-17.
  12. Till C, Green R, Flora D, et al. Fluoride exposure from infant formula and child IQ in a Canadian birth cohort. Environ Int. 2020;134:105315. PubMed
  13. Seddek AL, Ghallab A. Fluoride: No evidence of developmental neurotoxicity due to current exposure levels in Europe. Arch Toxicol. 2020;94(7):2543-2544. PubMed
  14. Green R, Lanphear B, Hornung R, et al. Association between maternal fluoride exposure during pregnancy and IQ scores in offspring in Canada. JAMA Pediatr. 2019;173(10):940-8. PubMed
  15. Guth S, Hüser S, Roth A, et al. Toxicity of fluoride: critical evaluation of evidence for human developmental neurotoxicity in epidemiological studies, animal experiments and in vitro analyses. Arch Toxicol. 2020;94(5):1375-1415. 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 Fluoride and Duloxetine Together: Common Questions

Is it safe to take Fluoride with Duloxetine?
We do not list a known interaction between Fluoride and Duloxetine. 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 Fluoride and Duloxetine have any of the same side effects?
Yes — our sources link each of them separately to 3 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.
Does Duloxetine interact with any supplements?
Yes. Duloxetine has documented interactions with 132 supplements in our database — Fluoride is not one of them. The Duloxetine 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

Fluoride monograph Uses, safety profile, and every drug interaction in one place Duloxetine drug information The full plain-English guide to this medication Duloxetine supplement interactions Every supplement checked against Duloxetine, 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 39 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Duloxetine and Fluoride?

Our pharmacists answer your medication & supplement questions — free.

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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.