Herb & supplement monograph

Bifidobacterium Longum Drug Interactions, Uses, Effectiveness, Safety & More

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS ·Updated July 2026

What is this page for?

First and foremost: how Bifidobacterium Longum interacts with medications. The heart of this page is the interaction list — every drug Bifidobacterium Longum is known to interact with, and how serious each one is.

But these pages have grown well beyond that into a full monograph — what Bifidobacterium Longum is, what people use it for and how strong the evidence is, its safety and side effects, and answers to the questions we’re asked most — written and reviewed by the clinical staff at HelloPharmacist. It’s educational information from our licensed clinical databases, not medical advice, and we don’t sell or endorse products. Our editorial policy

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On this page

Interaction report

Drugs that interact with Bifidobacterium Longum

182 medications have a known interaction with Bifidobacterium Longum, graded by severity. Select any drug for the full evidence-based detail.

Don’t want to scroll the list? Just ask.

Tell us the medications you take and we’ll check each one against Bifidobacterium Longum using our pharmacist-reviewed interaction data.

AI summaries are generated from our Bifidobacterium Longum interaction data for education only — always confirm with your pharmacist. How we use AI

2,830 drugs

Read The List Like a Pharmacist

What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
Probable. Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
Possible. Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists
Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
Each drug listed above links to the full report for that exact Bifidobacterium Longum combination — clinical detail, likelihood, evidence level, and citations.
Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

The big picture

The kinds of drugs Bifidobacterium Longum affects

Every type of medication (drug category) Bifidobacterium Longum is known to interact with. Open any category for the detail — or search your exact drug in the checker above.

All 1 drug category Bifidobacterium Longum interacts with

Antibiotic Drugs

Theoretically, taking Bifidobacterium longum with antibiotic drugs might decrease the effectiveness of B. longum.
Since B. longum preparations usually contain live and active organisms, simultaneously taking antibiotics might kill a significant number of the organisms. Tell patients to separate administration of antibiotics and B. longum preparations by at least 2 hours.

Likelihood Probable Evidence D

Monograph

Bifidobacterium Longum: Uses, Safety & Side Effects

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS · Reviewed July 2026 ·

The bottom line

Bifidobacterium longum is a 'friendly' bacterium found naturally in the human gut and used as a probiotic. It is generally well tolerated and is most studied for digestive issues, though evidence for many uses is still limited or mixed. Talk to your pharmacist or doctor before using it, especially if you have a weakened immune system.

Scientific name: Bifidobacterium longum
Family: Bifidobacteriaceae
Part used: Live bacterial cells (probiotic)
Common forms: Capsules, tablets, powders, sachets, fermented foods, and multi-strain probiotic blends

People commonly use it for

Digestive health and regularity
Irritable bowel syndrome (IBS)
Diarrhea (including antibiotic-related)
Immune support
Mood and stress (gut-brain axis)

Popular and traditional uses — not proof it works. See “Uses & effectiveness” below for the evidence.

Safety at a glance

OverallUse caution

Generally well tolerated in healthy people, but caution is needed for those who are seriously ill or immune-compromised.

PregnancyPossibly Safe

When used orally and appropriately, short-term. A combination of Bifidobacterium longum and Lacticaseibacillus rhamnosus has been used with apparent s...

Read the full pregnancy detail

BreastfeedingPossibly Safe

When used orally and appropriately, short-term. A combination of Bifidobacterium longum and Lacticaseibacillus rhamnosus has been used with apparent s...

Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center). Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

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Overview

Bifidobacterium longum is a type of beneficial bacteria that lives naturally in the human digestive tract. It is one of the first bacteria to colonize the gut of newborns, especially breastfed babies, and it remains an important part of a healthy gut microbiome throughout life.

As a supplement, B. longum is grown in controlled conditions and sold as a probiotic. It comes alone or, more often, combined with other probiotic strains. You can find it in capsules, powders, sachets, and some fermented foods or dairy products.

People take B. longum mainly to support digestive health, but it is also marketed for immune support and, more recently, for mood and stress through the so-called 'gut-brain axis.'

How it works

As a probiotic, Bifidobacterium longum is thought to work by adding helpful bacteria to the gut. Proposed mechanisms include crowding out harmful bacteria, producing short-chain fatty acids that nourish the gut lining, and helping keep the gut barrier healthy.

It may also interact with the immune system in the gut and influence signals that travel between the gut and the brain. Much of this understanding comes from laboratory and animal studies, so how strongly these effects apply to people is still being worked out.

Effectiveness

Does Bifidobacterium Longum work?

Here’s what the research actually shows for each use — graded by Natural Medicines and reviewed by Dr. Brian Staiger, PharmD.

Evidence overview · 49 uses evaluated

49 Insufficient evidence

How to read these evidence grades

Natural Medicines’ 7-point scale. We show each rating’s label word-for-word.

1EffectiveStrong, consistent evidence it works.

2Likely EffectiveGood evidence, though not yet conclusive.

3Possibly EffectiveSome evidence suggests a benefit.

4Possibly IneffectiveSome evidence it may not help.

5Likely IneffectiveFairly strong evidence it doesn’t help.

6IneffectiveStrong evidence it doesn’t work.

7Insufficient Reliable Evidence to RateToo little research to say either way.

For Bifidobacterium Longum, current evidence isn’t strong enough to rate any specific use. The conditions it has been studied for are listed below.

Also studied for 49 conditions — evidence insufficient to rate

Insufficient Reliable Evidence To Rate Abdominal pain