Drug & supplement interaction

Bifidobacterium Breve + Fexofenadine

Fexofenadine brand name: Allegra.

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 Bifidobacterium Breve and Fexofenadine 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

Bifidobacterium Breve and Fexofenadine

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 Fexofenadine and Bifidobacterium Breve 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.

Bifidobacterium Breve safety at a glance

Bifidobacterium Br... overall Use caution Generally well tolerated in healthy people, but caution is needed for those who are very ill or immunocompromised.
Pregnancy Use caution Probiotics are often considered low-risk, but evidence is limited, so use only with your doctor's guidance.
Breastfeeding Use caution Limited safety data exist, so check with your healthcare provider before use.

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

Still wondering about combining Fexofenadine and Bifidobacterium Breve? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Fexofenadine

Interactions in our licensed database are recorded against drug classes, not just single drug names. Fexofenadine is filed under 6 classifications — including organic anion-transporting polypeptide substrates (oatp), p-glycoprotein substrates, seizure threshold lowering drugs. Bifidobacterium Breve has documented interactions with 1 drug class — the most serious being antibiotic drugs (moderate) — and none of Fexofenadine’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

Bifidobacterium Breve Does Interact With Other Medications

Bifidobacterium Breve has 182 moderate known drug interactions in our database — Fexofenadine isn’t one of them. If you take anything else, check it against the full list below.

Moderate 182 No known interaction 2,648 (incl. Fexofenadine)
Taking anything else?

Check Another of Your Medications Against Bifidobacterium Breve

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

What to actually watch for

What Bifidobacterium Breve Itself Has Been Linked To

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

  • A bowel blockage / A higher chance of infection Worth acting on Additional detail

    “There have been rare cases of Bifidobacterium bacteremia related to probiotic use in critically ill infants and adults. In addition, cases of B. breve bacteremia have occurred in preterm infants or young children using probiotics. In a review of 298 term and preterm infants who were admitted to the neonatal intensive care unit of a hospital in Japan and received B.”

    Bifidobacterium Breve · Natural Medicines adverse-effect record, reported in diabetes.

    6 sources cited
    1. 102416. Pruccoli G, Silvestro E, Pace Napoleone C, Aidala E, Garazzino S, Scolfaro C. Are probiotics safe? Bifidobacterium bacteremia in a child with severe heart failure. Infez Med. 2019;27(2):175-178.
    2. 107597. Sakurai Y, Watanabe T, Miura Y, et al. Clinical and bacteriologic characteristics of six cases of Bifidobacterium breve bacteremia due to probiotic administration in the neonatal intensive care unit. Pediatr Infect Dis J 2022;41(1):62-65. PubMed
    3. 107599. Esaiassen E, Hjerde E, Cavanagh JP, Simonsen GS, Klingenberg C; Norwegian Study Group on Invasive Bifidobacterial Infections. Bifidobacterium bacteremia: Clinical characteristics and a genomic approach to assess pathogenicity. J Clin Microbiol. 2017;55(7) PubMed
    4. 107596. Ohishi A, Takahashi S, Ito Y, et al. Bifidobacterium septicemia associated with postoperative probiotic therapy in a neonate with omphalocele. J Pediatr. 2010;156(4):679-81. PubMed
    5. 111007. Wakabayashi Y, Nakayama S, Yamamoto A, et al. First case of necrotizing fasciitis and bacteremia caused by Bifidobacteriumbreve. Anaerobe 2022;76:102613.
    6. 111011. Takeda Y, Ota K, Kondo A, et al. A case of necrotizing fasciitis caused by Bifidobacterium breve. IDCases 2022;31:e01667. PubMed
  • Bloating or gas Additional detail

    “Bloating and flatulence have been reported with probiotic use; however, these adverse effects have not been reported from ingestion of Bifidobacterium breve in particular.”

    Bifidobacterium Breve · Natural Medicines adverse-effect record, reported in flatulence.

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

From our Q&A

Questions About Bifidobacterium Breve or Fexofenadine

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

This page covers Bifidobacterium Breve only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Fexofenadine page lists 154 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Apple (major), Grapefruit (major), St. John's Wort (major) and Sweet Orange (major).

By severity: 5 major · 111 moderate · 38 minor.

From our pharmacist’s overview on the Fexofenadine page

“An over-the-counter allergy pill sounds like the last place serious interactions would hide, but fexofenadine (Allegra) has 154 supplements and foods on file, and the five rated major deserve real attention before you combine it with much of anything else. Two of those five sit in most refrigerators.”

Reviewed by 2 · Jul 18, 2026

Open the Fexofenadine interaction page

One more smart check

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

We hold 1,771 real supplement products containing Bifidobacterium Breve, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Bifidobacterium Breve. Even though Bifidobacterium Breve itself has no known interaction with Fexofenadine, 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 Bifidobacterium Breve and Fexofenadine 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 Bifidobacterium Breve
Top 25%

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

29 days ago today
Medication Fexofenadine
Top 25%

#368 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 Bifidobacterium Breve reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Bifidobacterium Breve and Fexofenadine 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 Bifidobacterium Breve

What is Bifidobacterium Breve?

  • Digestive health and regularity
  • Infant colic and gut support
  • Diarrhea (including antibiotic-related)
  • Constipation
  • General immune and gut microbiome support

Bifidobacterium breve is a 'friendly' gut bacterium taken as a probiotic, most often to support digestion and balance the gut microbiome. Some studies suggest possible benefits for certain digestive and infant conditions, but evidence is still limited and varies by strain. It is generally well tolerated in healthy people, but anyone with a weak immune system or serious illness should check with a doctor or pharmacist first.

Bifidobacterium breve · Bifidobacteriaceae · Live bacterial cells (probiotic strain) · Capsules, powders, sachets, chewables, drops, and fortified foods or drinks

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

Bifidobacterium Breve: dosing

There is no single standard dose of Bifidobacterium breve. Probiotic amounts are usually measured in colony-forming units (CFU), and products vary widely in their strain and strength.The best approach is to follow the directions on the product label, since dosing was often based on the specific strain studied.

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

Read the full Bifidobacterium Breve monograph & all interactions
Medication

About Fexofenadine

What Is Fexofenadine Used For?

Brand name: Allegra

Fexofenadine temporarily relieves symptoms of hay fever (seasonal allergic rhinitis) and other upper respiratory allergies, including runny nose, sneezing, itchy or watery eyes, and itching of the nose or throat.

Several products — including Allegra Hives 24hr tablets — are specifically used to reduce hives (urticaria) and relieve the itching that comes with them. Keep in mind that fexofenadine will not prevent hives or stop an allergic skin reaction from happening in the first place.

Most-Reported Side Effects for Fexofenadine

From FAERS, the FDA’s public side-effect reporting system (40,472 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Fatigue 1,945 reports
Nausea 1,876 reports
Headache 1,870 reports
Pruritus 1,733 reports
Diarrhea 1,622 reports
See full Fexofenadine drug information
Keep checking

Other Drugs & Bifidobacterium Breve

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

0Major
182Moderate
0Minor
2,647No known interaction
182 Moderate 2,647 No interaction
Moderate

182 interactions

Showing 60 of 182 moderate interactions — see all 182 on the Bifidobacterium Breve page.

No interaction 2,647 drugs checked — show the list

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

Showing the 60 most looked-up of 2,647 medications checked with no known interaction — see the full Bifidobacterium Breve list.

See the full Bifidobacterium Breve interactions page
See every supplement checked against Fexofenadine, ranked by severity
Evidence & sources

Bifidobacterium Breve References

The 9 references that drive our Bifidobacterium Breve 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. Pierce A. The American Pharmaceutical Association Practical Guide to Natural Medicines. New York: The Stonesong Press, 1999:19.
  2. Xiao JZ, Takahashi S, Odamaki T, et al. Antibiotic susceptibility of bifidobacterial strains distributed in the Japanese market. Biosci Biotechnol Biochem. 2010;74(2):336-42. PubMed
  3. Pruccoli G, Silvestro E, Pace Napoleone C, Aidala E, Garazzino S, Scolfaro C. Are probiotics safe? Bifidobacterium bacteremia in a child with severe heart failure. Infez Med. 2019;27(2):175-178.
  4. Ohishi A, Takahashi S, Ito Y, et al. Bifidobacterium septicemia associated with postoperative probiotic therapy in a neonate with omphalocele. J Pediatr. 2010;156(4):679-81. PubMed
  5. Sakurai Y, Watanabe T, Miura Y, et al. Clinical and bacteriologic characteristics of six cases of Bifidobacterium breve bacteremia due to probiotic administration in the neonatal intensive care unit. Pediatr Infect Dis J 2022;41(1):62-65. PubMed
  6. Esaiassen E, Hjerde E, Cavanagh JP, Simonsen GS, Klingenberg C; Norwegian Study Group on Invasive Bifidobacterial Infections. Bifidobacterium bacteremia: Clinical characteristics and a genomic approach to assess pathogenicity. J Clin Microbiol. 2017;55(7) PubMed
  7. Wakabayashi Y, Nakayama S, Yamamoto A, et al. First case of necrotizing fasciitis and bacteremia caused by Bifidobacteriumbreve. Anaerobe 2022;76:102613.
  8. Takeda Y, Ota K, Kondo A, et al. A case of necrotizing fasciitis caused by Bifidobacterium breve. IDCases 2022;31:e01667. PubMed
  9. Suwantarat N, Romagnoli M, Wakefield T, Carroll KC. Ventriculoperitoneal shunt infection caused by Bifidobacterium breve. Anaerobe 2014;28:1-3. 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 Bifidobacterium Breve and Fexofenadine Together: Common Questions

Is it safe to take Bifidobacterium Breve with Fexofenadine?
We do not list a known interaction between Bifidobacterium Breve and Fexofenadine. 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.
How was the Bifidobacterium Breve and Fexofenadine combination checked?
Interactions in our licensed database are recorded against drug classes. Fexofenadine is filed under 6 classifications, and Bifidobacterium Breve has documented interactions with 1 drug class — none of Fexofenadine'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 Bifidobacterium Breve interact with any other medications?
Yes. Bifidobacterium Breve has 182 documented drug interactions in our database — Fexofenadine 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 Fexofenadine interact with any supplements?
Yes. Fexofenadine has documented interactions with 154 supplements in our database — Bifidobacterium Breve is not one of them. The Fexofenadine 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

Bifidobacterium Breve monograph Uses, safety profile, and every drug interaction in one place Fexofenadine drug information The full plain-English guide to this medication Fexofenadine supplement interactions Every supplement checked against Fexofenadine, 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 9 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Fexofenadine and Bifidobacterium Breve?

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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.