Drug & supplement interaction

Rhatany + Lanthanum Carbonate

Lanthanum Carbonate brand name: Fosrenol.

No Known Interaction
Medically reviewed by · Updated June 2026 · Pair last verified Sep 27, 2026
The bottom line No known interaction

We found no known interaction between Rhatany and Lanthanum Carbonate 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 Lanthanum Carbonate states a food rule worth keeping to.

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Interaction report

Rhatany and Lanthanum Carbonate

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 Lanthanum Carbonate and Rhatany 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 Rhatany at all — not against Lanthanum Carbonate, 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.

Rhatany safety at a glance

Rhatany overall Use caution Generally used short-term as a mouth rinse, but human safety data are limited and it should not be swallowed in large amounts.
Pregnancy Avoid Not enough safety information is available, so it is best avoided.
Breastfeeding Avoid There is no reliable safety data during breastfeeding, so avoid use.

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

Still wondering about combining Lanthanum Carbonate and Rhatany? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

What Lanthanum Carbonate’s Own FDA Label Lists

This is not an interaction — none of it involves Rhatany. These are the most notable effects listed in the ADVERSE REACTIONS section of Lanthanum Carbonate’s own FDA label, for the medication by itself. Knowing the drug’s own list makes it easier to work out the likely cause if something new turns up while you take both. One of them is worth acting on rather than waiting out — marked below.

  • A bowel blockage Worth acting on
  • Stomach upset
  • Constipation
  • Stomach pain
  • Diarrhea
  • Vomiting
  • Nausea

From the ADVERSE REACTIONS section of the FDA label for Lanthanum Carbonate. Read the label on DailyMed › Rhatany’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no Rhatany side to compare — that is a limit of the record, not a statement that Rhatany has no side effects.

How to take them

Some Lanthanum Carbonate Products Have a Food Rule — Rhatany Should Not Break It

At least one FDA label for a product containing Lanthanum Carbonate says to take it with food. If you take Rhatany on an empty stomach out of habit, keep them separate — and take Lanthanum Carbonate 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 Lanthanum Carbonate 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.

Do not store FOSRENOL Oral Powder for future use once mixed with food.

From the Dosage and Administration section of the FDA label we read for Lanthanum Carbonate — 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 Lanthanum Carbonate

This page covers Rhatany only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Lanthanum Carbonate page lists 17 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Coffee Charcoal (moderate), European Mandrake (moderate), Glucomannan (moderate) and Guar Gum (moderate).

By severity: 1 major · 7 moderate · 9 minor.

Open the Lanthanum Carbonate interaction page

How much people look this up

Where Rhatany and Lanthanum Carbonate 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 Rhatany
Steady interest

#1,180 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Lanthanum Carbonate
Top half

#1,352 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.
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 27, 2026. The Rhatany and Lanthanum Carbonate records this page draws on were last updated June 22, 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 Rhatany

What is Rhatany?

  • Mouth and throat irritation
  • Gum inflammation
  • Sore throat
  • Mild diarrhea
  • Minor skin and mucous membrane inflammation

Rhatany is the root of a South American shrub that is rich in astringent tannins, and it has been used traditionally as a mouth rinse or gargle for inflamed gums and sore throat. Solid human evidence for its benefits is very limited, so it should be viewed as a traditional remedy rather than a proven treatment. Talk to your pharmacist or doctor before using it, and avoid it during pregnancy and breastfeeding due to a lack of safety data.

Krameria lappacea · Krameriaceae · Dried root · Tincture, mouthwash/gargle, tea, lozenges, powdered root extract

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

Rhatany: dosing

There is no well-established standardized dose for rhatany. It is most often found in commercial mouthwashes, gargles, tinctures, and lozenges, and the strength varies from product to product.The safest approach is to follow the directions on the specific product label and not to swallow mouth rinses or use them longer than recommended.

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

Read the full Rhatany monograph & all interactions
Medication

About Lanthanum

What Is Lanthanum Used For?

Brand name: Fosrenol

Lanthanum is used to lower phosphate in the blood of people with end-stage renal disease (ESRD). Both Fosrenol and generic lanthanum carbonate chewable tablets carry this use.

Managing high phosphorus in ESRD usually involves three things: eating less phosphate, removing phosphate with dialysis, and using a phosphate binder to reduce how much phosphate the gut absorbs. Lanthanum is the binder part of that plan.

See full Lanthanum drug information
Keep checking

Other Drugs & Rhatany

Browse every other medication we’ve checked against Rhatany — 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 Rhatany 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 Rhatany list.

See the full Rhatany interactions page
See every supplement checked against Lanthanum Carbonate, ranked by severity
Sources

Sources & How We Checked

We checked Rhatany against Lanthanum Carbonate in the Natural Medicines interaction database and found no documented interaction on file. The medication overview comes from MedlinePlus, and supplement label details from the NIH Dietary Supplement Label Database.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

Keep exploring
Rhatany monograph › Uses, safety, and every drug interaction in one place Lanthanum Carbonate supplement interactions › Every supplement checked against Lanthanum Carbonate, ranked by severity Lanthanum drug information › The full plain-English guide to this medication Supplement interaction checker › Check any supplement or product against your medications Browse medications A–Z › Every drug we've checked against herbs & supplements Ask a pharmacist › Free, personal answer from our licensed team
Pharmacist Counseling Corner

Taking Rhatany and Lanthanum Carbonate Together: Common Questions

Is it safe to take Rhatany with Lanthanum Carbonate?
We do not list a known interaction between Rhatany and Lanthanum Carbonate. 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.
Should I take Rhatany and Lanthanum Carbonate at the same time of day?
At least one FDA label for a product containing Lanthanum Carbonate says to take it with food. If you take Rhatany on an empty stomach out of habit, keep them separate and take Lanthanum Carbonate with a meal where the label says to. Food instructions belong to the product rather than the ingredient — two Lanthanum Carbonate products can differ — so check the directions on your own box. This is about absorption, not an interaction.
Does Lanthanum Carbonate interact with any supplements?
Yes. Lanthanum Carbonate has documented interactions with 17 supplements in our database — Rhatany is not one of them. The Lanthanum Carbonate interaction page linked on this page lists every one, ranked by severity.

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

Still Have a Question About Lanthanum Carbonate and Rhatany?

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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.