Drug & supplement interaction

Carrageenan + Brompheniramine

Brompheniramine brand names: Lodrane, Dimetane.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Sep 20, 2026
The bottom line No known interaction

We found no known interaction between Carrageenan and Brompheniramine 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

Carrageenan and Brompheniramine

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 Brompheniramine and Carrageenan 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.

Carrageenan safety at a glance

Carrageenan overall Use caution Food-grade carrageenan is widely used, but its value and safety as a supplement is uncertain and degraded forms may irritate the gut.
Pregnancy Likely Safe When used in food amounts. There is insufficient reliable information available about the safety of using larger amounts; avoid using. Read the full pregnancy detail
Breastfeeding Likely Safe When used in food amounts. There is insufficient reliable information available about the safety of using larger amounts; avoid using. 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 Brompheniramine and Carrageenan? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Brompheniramine

Interactions in our licensed database are recorded against drug classes, not just single drug names. Brompheniramine is filed under 3 classifications — photosensitizing drugs, seizure threshold lowering drugs, oral drugs. Carrageenan has documented interactions with 1 drug class — the most serious being anticoagulant/antiplatelet drugs (moderate) — and none of Brompheniramine’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

Carrageenan Does Interact With Other Medications

Carrageenan has 122 moderate known drug interactions in our database — Brompheniramine isn’t one of them. If you take anything else, check it against the full list below.

Moderate 122 No known interaction 2,708 (incl. Brompheniramine)
Taking anything else?

Check Another of Your Medications Against Carrageenan

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

What to actually watch for

What Carrageenan Itself Has Been Linked To

This is not an interaction — nothing below involves Brompheniramine. It is the side-effect record for Carrageenan on its own, from the licensed Natural Medicines monograph. If something new turns up after you add Carrageenan, this list is the first place to look. One entry is worth acting on rather than waiting out — marked below.

  • Bleeding or bruising Worth acting on Additional detail

    “In one clinical study in males, carrageenan gel applied topically to the penis and anus prior to anal intercourse was reported to cause rectal bleeding that was not directly related to anal intercourse in 8% of patients, compared with 0% of patients using placebo.”

    Carrageenan · Natural Medicines adverse-effect record, reported in bleeding.

    1 source cited
    1. 107851. Laurie C, El-Zein M, Tota JE, et al. Efficacy of a carrageenan gel in preventing anal human papillomavirus (HPV) infection: interim analysis of the Lubricant Investigation in Men to Inhibit Transmission of HPV Infection (LIMIT-HPV) randomised controlled t
  • Itching Additional detail

    “Intravaginally, carrageenan gel has been associated with mild vaginal itching and burning, a vaginal abrasion, bladder fullness, and urinary hesitancy. However, it is unclear if carrageenan was the causal factor of these symptoms.”

    Carrageenan · Natural Medicines adverse-effect record, reported in pruritus.

    2 sources cited
    1. 40044. Coggins, C., Blanchard, K., Alvarez, F., Brache, V., Weisberg, E., Kilmarx, P. H., Lacarra, M., Massai, R., Mishell, D., Jr., Salvatierra, A., Witwatwongwana, P., Elias, C., and Ellertson, C. Preliminary safety and acceptability of a carrageenan gel for
    2. 40068. Elias, C. J., Coggins, C., Alvarez, F., Brache, V., Fraser, I. S., Lacarra, M., Lahteenmaki, P., Massai, R., Mishell, D. R., Jr., Phillips, D. M., and Salvatierra, A. M. Colposcopic evaluation of a vaginal gel formulation of iota-carrageenan. Contracepti PubMed

Everything above comes from the Natural Medicines adverse-effect record for Carrageenan — expand a row for the licensed statement it rests on. We haven’t matched Brompheniramine 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 Brompheniramine.

Special populations

Carrageenan in Pregnancy & Breastfeeding

Pregnancy And Lactation Likely Safe

When used in food amounts. There is insufficient reliable information available about the safety of using larger amounts; avoid using.

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

Overlapping uses

What Brompheniramine Is Prescribed For, and What Carrageenan Has Been Studied For

These two come up together because they touch the same health topic — not because they do the same job. Brompheniramine is a prescription medicine with approved uses on its FDA label. Carrageenan is a supplement: what follows is what researchers have looked at it for, and how strong that evidence is.

Brompheniramine is prescribed for: Brompheniramine temporarily relieves common allergy symptoms. Both CVS Pharmacy oral liquid and Dimetapp oral solution are used to treat runny nose, sneezing, itching of the nose or throat, and itchy, watery eyes due to hay fever.

Carrageenan has been studied for:

  • Common cold studied, not established Carrageenan has been studied for this. Natural Medicines rates the evidence: Insufficient Reliable Evidence To Rate Read what the research shows

    Carrageenan for common cold

    Evidence on the use of intranasal iota-carrageenan for improving symptoms of the common cold is conflicting.

Effectiveness ratings and the research summaries above are the verbatim record from the Natural Medicines database, which grades evidence from “Effective” down to “Insufficient Reliable Evidence To Rate”. A rating below the top of that scale means researchers have looked at it — not that it works, and never that it can stand in for a prescribed medicine. Do not stop or replace Brompheniramine on your own; if you are taking Carrageenan for the same health topic, tell your prescriber, especially if the medicine is being adjusted to a target.

From our Q&A

Questions About Carrageenan or Brompheniramine

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Carrageenan or Brompheniramine, 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 Brompheniramine

This page covers Carrageenan only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Brompheniramine page lists 43 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Alfalfa (moderate), Angelica Archangelica (moderate), Arrach (moderate) and Bergamot (moderate).

By severity: 1 major · 32 moderate · 10 minor.

From our pharmacist’s overview on the Brompheniramine page

“Brompheniramine, the sedating antihistamine in Dimetane and many combination cold medicines, deserves genuine care around supplements rather than a quick scan. The single major-rated entry is activated charcoal, which binds drugs in the gut and can sharply cut how much brompheniramine reaches your bloodstream.”

Reviewed by 2 · Jul 18, 2026

Open the Brompheniramine interaction page

One more smart check

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

We hold 31 real supplement products containing Carrageenan, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Carrageenan. Even though Carrageenan itself has no known interaction with Brompheniramine, 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 Carrageenan and Brompheniramine 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 Carrageenan
Top half

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

29 days ago today
Medication Brompheniramine
Top half

#1,080 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 Carrageenan reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Carrageenan and Brompheniramine 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 Carrageenan

What is Carrageenan?

  • Food thickener and stabilizer
  • Digestive complaints (traditional use)
  • Cough and sore throat (traditional use)
  • Laxative or bowel-related uses
  • Antiviral (laboratory interest)

Carrageenan is a fiber-like substance taken from red seaweed and is mostly used as a thickener and gelling agent in foods. There is little solid human evidence supporting it as a health supplement, and some forms (especially degraded carrageenan) have raised digestive and inflammation concerns, so it should not be relied on to treat any condition.

Extracted polysaccharide from red seaweed (Rhodophyceae) · Food additive (thickener/gel), capsules, and occasional supplement blends

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

Carrageenan: dosing

There is no established standard supplement dose of carrageenan. In foods, it is used in small amounts purely as a texture ingredient, not as a measured health dose.If you choose to use a product that contains carrageenan, follow the directions on the label and do not exceed them.

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

Read the full Carrageenan monograph & all interactions
Medication

About Brompheniramine

What Is Brompheniramine Used For?

Brand names: Lodrane, Dimetane

Brompheniramine temporarily relieves common allergy symptoms. Both CVS Pharmacy oral liquid and Dimetapp oral solution are used to treat runny nose, sneezing, itching of the nose or throat, and itchy, watery eyes due to hay fever.

See full Brompheniramine drug information
Keep checking

Other Drugs & Carrageenan

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

0Major
122Moderate
0Minor
2,707No known interaction
122 Moderate 2,707 No interaction
Moderate

122 interactions

Showing 60 of 122 moderate interactions — see all 122 on the Carrageenan page.

No interaction 2,707 drugs checked — show the list

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

Showing the 60 most looked-up of 2,707 medications checked with no known interaction — see the full Carrageenan list.

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

Carrageenan References

The 6 references that drive our Carrageenan 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. Leung AY, Foster S. Encyclopedia of Common Natural Ingredients Used in Food, Drugs and Cosmetics. 2nd ed. New York, NY: John Wiley & Sons, 1996.
  2. Fetrow CW, Avila JR. Professional's Handbook of Complementary & Alternative Medicines. 1st ed. Springhouse, PA: Springhouse Corp., 1999.
  3. Coggins, C., Blanchard, K., Alvarez, F., Brache, V., Weisberg, E., Kilmarx, P. H., Lacarra, M., Massai, R., Mishell, D., Jr., Salvatierra, A., Witwatwongwana, P., Elias, C., and Ellertson, C. Preliminary safety and acceptability of a carrageenan gel for
  4. Tobacman, J. K., Wallace, R. B., and Zimmerman, M. B. Consumption of carrageenan and other water-soluble polymers used as food additives and incidence of mammary carcinoma. Med.Hypotheses 2001;56(5):589-598. PubMed
  5. Elias, C. J., Coggins, C., Alvarez, F., Brache, V., Fraser, I. S., Lacarra, M., Lahteenmaki, P., Massai, R., Mishell, D. R., Jr., Phillips, D. M., and Salvatierra, A. M. Colposcopic evaluation of a vaginal gel formulation of iota-carrageenan. Contracepti PubMed
  6. Laurie C, El-Zein M, Tota JE, et al. Efficacy of a carrageenan gel in preventing anal human papillomavirus (HPV) infection: interim analysis of the Lubricant Investigation in Men to Inhibit Transmission of HPV Infection (LIMIT-HPV) randomised controlled t

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 Carrageenan and Brompheniramine Together: Common Questions

Is it safe to take Carrageenan with Brompheniramine?
We do not list a known interaction between Carrageenan and Brompheniramine. 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.
Are Carrageenan and Brompheniramine used for the same thing?
They overlap in purpose, which usually means the real question is whether you need both rather than whether they are safe together. This page lists the shared uses and how strong the evidence is for Carrageenan in each. That is a conversation for your prescriber, especially if Brompheniramine is being adjusted to a target.
How was the Carrageenan and Brompheniramine combination checked?
Interactions in our licensed database are recorded against drug classes. Brompheniramine is filed under 3 classifications, and Carrageenan has documented interactions with 1 drug class — none of Brompheniramine'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 Carrageenan interact with any other medications?
Yes. Carrageenan has 122 documented drug interactions in our database — Brompheniramine 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 Brompheniramine interact with any supplements?
Yes. Brompheniramine has documented interactions with 43 supplements in our database — Carrageenan is not one of them. The Brompheniramine 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

Carrageenan monograph Uses, safety profile, and every drug interaction in one place Brompheniramine drug information The full plain-English guide to this medication Brompheniramine supplement interactions Every supplement checked against Brompheniramine, 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 6 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Brompheniramine and Carrageenan?

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.