Bismuth Nitrate + Clemastine
Clemastine brand name: Tavist Allergy.
We found no known interaction between Bismuth Nitrate and Clemastine 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.
Bismuth Nitrate and Clemastine
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 Clemastine and Bismuth Nitrate 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 Bismuth Nitrate at all — not against Clemastine, 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.
Bismuth Nitrate safety at a glance
Safety guidance is general; always confirm with your pharmacist or doctor for your situation.
Questions About Bismuth Nitrate or Clemastine
These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Bismuth Nitrate or Clemastine, 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:
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Not quite your question? Ask our pharmacists directly — it is free, there is no account required, and answers usually come back within 24 hours.
See Every Supplement That Interacts With Clemastine
This page covers Bismuth Nitrate only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Clemastine page lists 72 supplements it has a documented interaction with, worst first, each one explained.
The most serious there right now: Activated Charcoal (major), Henbane (major), Scopolia (major), Alfalfa (moderate) and Angel's Trumpet (moderate).
By severity: 3 major · 57 moderate · 12 minor.
From our pharmacist’s overview on the Clemastine page
“Clemastine (Tavist Allergy) is an older, sedating antihistamine that already dries the mouth, blurs vision, and slows the gut, and that is exactly why this list earns real caution rather than a quick skim. Thirty of the 72 supplements on file pile the same drying, sedating anticholinergic load on top, and two of the three major-rated e…”
Reviewed by 2 · Jul 18, 2026
Taking Bismuth Nitrate as Part of a Dietary Supplement Product? Check It for Interactions
We hold 1 real supplement products containing Bismuth Nitrate, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Bismuth Nitrate. Even though Bismuth Nitrate itself has no known interaction with Clemastine, another ingredient on your label might. Find your product and we’ll check every ingredient on its label:
Where Bismuth Nitrate and Clemastine 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.
#1,242 of 1,452 supplements looked up here in the last 7 days
#2,318 of 2,830 medications looked up here in the last 7 days
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 Bismuth Nitrate reference on this page ↓
- Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Bismuth Nitrate and Clemastine 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.
About Bismuth Nitrate
What is Bismuth Nitrate?
- Upset stomach and indigestion
- Diarrhea
- Wound and skin protection (topical)
- Mild antiseptic
Bismuth nitrate is a bismuth-based chemical compound that was historically used for stomach complaints and as a mild topical antiseptic, but it is not a common modern dietary supplement and is rarely used today. Better-studied bismuth products (like bismuth subsalicylate) have largely replaced it, and bismuth nitrate carries safety concerns, so talk with a pharmacist or doctor before using any bismuth product.
Not applicable (a chemical bismuth compound, not a plant) · Compounded powders, topical preparations, and historically in some oral antacid or stomach formulas
An interaction check asks whether these two react with each other — it does not ask whether Bismuth Nitrate is a good idea for someone in your situation. Here is what our Bismuth Nitrate record says about it on its own.
Bismuth Nitrate: dosing
There is no established standard dose of bismuth nitrate as a supplement, and it is not a typical over-the-counter product. Because of this, no specific safe amount can be recommended here.If a product containing bismuth nitrate is available to you, follow the directions on the label exactly and do not exceed them.
From our Bismuth Nitrate monograph — the full record covers uses, side effects and every documented interaction.
About Clemastine
What Is Clemastine Used For?
Brand name: Tavist Allergy
Clemastine treats symptoms of allergic rhinitis (hay fever and similar nasal allergies) — including sneezing, runny nose, itching, and watery eyes. The oral solution (Clemastine Fumarate syrup) is indicated for adults and children aged 6 through 12 years. The tablets (Clemastine Fumarate and Clemsza) are indicated for adults.
Clemastine also treats mild, uncomplicated allergic skin reactions — specifically urticaria (hives) and angioedema (swelling under the skin) — at the appropriate dosage level, in both the oral solution and tablet forms.
Other Drugs & Bismuth Nitrate
Browse every other medication we’ve checked against Bismuth Nitrate — both the ones with a known interaction and the ones without. Select any drug for the full detail.
No drugs match “”.
No interaction 2,829 drugs checked — show the list
We also checked Bismuth Nitrate against these medications and found no known interaction in our sources. Open any page to confirm.
- Apixaban ›
- Levothyroxine ›
- Amlodipine ›
- Methylphenidate ›
- Warfarin ›
- Sertraline ›
- Testosterone ›
- Losartan Potassium ›
- Ivermectin ›
- Abemaciclib ›
- Aspirin ›
- Acetaminophen ›
- Metoprolol ›
- Rosuvastatin ›
- Rivaroxaban ›
- Escitalopram ›
- Clopidogrel ›
- Atorvastatin ›
- Docusate ›
- Tadalafil ›
- Tirzepatide ›
- Ibuprofen ›
- Methamphetamine ›
- Hydroxyurea ›
- Warfarin Sodium ›
- Valacyclovir ›
- Sumatriptan ›
- Semaglutide ›
- Prednisone ›
- Lisdexamfetamine ›
- Propranolol ›
- Metformin ›
- Amitriptyline ›
- Amoxicillin ›
- Lisinopril ›
- Isotretinoin ›
- Amlodipine Besylate ›
- Methotrexate ›
- Bendamustine ›
- Bupropion ›
- Amphetamine ›
- Doxycycline ›
- Fluoxetine ›
- Acyclovir ›
- Azithromycin ›
- Lamotrigine ›
- Pregabalin ›
- Dextroamphetamine ›
- Gabapentin ›
- Acetaminophen, Codeine ›
- Levothyroxine, Liothyronine ›
- Clonazepam ›
- Quetiapine ›
- Naproxen ›
- Omeprazole ›
- Letrozole ›
- Methylene Blue ›
- Duloxetine ›
- Buspirone ›
- Citalopram ›
Showing the 60 most looked-up of 2,829 medications checked with no known interaction — see the full Bismuth Nitrate list.
Bismuth Nitrate References
The 6 references that drive our Bismuth Nitrate 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.
- - Jaeger A, Kopferschmitt J, Sauder Ph, Flesch F, Tournoud C. Diagnosis in clinical toxicology. In: Bolt HM, de Wolff FA, Henderson PT (eds) Medical Toxicology. Archives of Toxicology (Supplement). Berlin/Heidelberg, Germany: Springer-Verlag; 1992:29-39. PubMed
- Bismuth nitrate; MSDS No. B3396 [Online]; Mallenckrodt Baker: Phillipsburg, NJ, December 8, 1996. https://hazard.com/msds/mf/baker/baker/files/b3396.htm (accessed December 27, 2019).
- Saberi-Firoozi M, Massarrat S, Zare S, et al. Effect of triple therapy or amoxycillin plus omeprazole or amoxycillin plus tinidazole plus omeprazole on duodenal ulcer healing, eradication of Helicobacter pylori, and prevention of ulcer relapse over a 1-ye
- Von Bose MJ, Zaudig M. Encephalopathy resembling Creutzfeldt-Jakob disease following oral, prescribed doses of bismuth nitrate. Br J Psychiatry. 1991;158:278-80. PubMed
- Lewis RJ Sr. Hazardous Chemicals Desk Reference. 6th Edition. Hoboken, NJ: Wiley; 2008.
- Raafat BM, Samir WA, Khader MH. Met-Hemoglobin concentration reduction and methemoglobin reductase enhancement after applying of alpha-tocopherol and selenium combination as a radio protector against ionizing radiation exposure. Wulfenia J. 2012;19(10):37
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.
Taking Bismuth Nitrate and Clemastine Together: Common Questions
Is it safe to take Bismuth Nitrate with Clemastine?
Do Bismuth Nitrate and Clemastine have any of the same side effects?
Does Clemastine interact with any supplements?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
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Still Have a Question About Clemastine and Bismuth Nitrate?
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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.