Drug & supplement interaction

Lactobacillus Johnsonii + Bacillus Calmette-Guerin

Bacillus Calmette-Guerin brand name: Pacis (BCG, live).

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Sep 13, 2026
The bottom line No known interaction

We found no known interaction between Lactobacillus Johnsonii and Bacillus Calmette-Guerin 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

Lactobacillus Johnsonii and Bacillus Calmette-Guerin

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 Bacillus Calmette-Guerin and Lactobacillus Johnsonii 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.

Lactobacillus Johnsonii safety at a glance

Lactobacillus John... overall Use caution Generally well tolerated in healthy adults, but people who are seriously ill or immune-compromised should be cautious.
Pregnancy Use caution There is not enough reliable safety data, so use only with a doctor's guidance.
Breastfeeding Use caution Safety has not been well studied, so check with a healthcare provider before using.

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

Still wondering about combining Bacillus Calmette-Guerin and Lactobacillus Johnsonii? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
Keep it in perspective

Lactobacillus Johnsonii Does Interact With Other Medications

Lactobacillus Johnsonii has 182 moderate known drug interactions in our database — Bacillus Calmette-Guerin 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. Bacillus Calmette-Guerin)
Taking anything else?

Check Another of Your Medications Against Lactobacillus Johnsonii

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

What to actually watch for

What Lactobacillus Johnsonii Itself Has Been Linked To

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

  • A higher chance of infection Worth acting on Additional detail

    “Since Lactobacillus johnsonii preparations contain live and active microorganisms, there is some concern that they might cause pathogenic infection in some patients. Some lactobacilli species have been isolated in cases of bacteremia, sepsis, splenic abscess, endocarditis, necrotizing fasciitis, pancreatic necrosis, and meningoencephalitis.”

    Lactobacillus Johnsonii · Natural Medicines adverse-effect record, reported in sepsis.

    1 source cited
    1. 107543. Rossi F, Amadoro C, Gasperi M, Colavita G. Lactobacilli infection case reports in the last three years and safety implications. Nutrients. 2022;14(6):1178. PubMed

Everything above comes from the Natural Medicines adverse-effect record for Lactobacillus Johnsonii — expand a row for the licensed statement it rests on. We haven’t matched Bacillus Calmette-Guerin 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 Bacillus Calmette-Guerin.

One more smart check

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

We hold 17 real supplement products containing Lactobacillus Johnsonii, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Lactobacillus Johnsonii. Even though Lactobacillus Johnsonii itself has no known interaction with Bacillus Calmette-Guerin, 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 Lactobacillus Johnsonii and Bacillus Calmette-Guerin 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 Lactobacillus Johnsonii
Steady interest

#1,364 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Bacillus Calmette-Guerin
Top half

#1,065 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 Lactobacillus Johnsonii reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Lactobacillus Johnsonii and Bacillus Calmette-Guerin 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 Lactobacillus Johnsonii

What is Lactobacillus Johnsonii?

  • Digestive and gut health
  • Supporting healthy gut bacteria
  • Diarrhea prevention or relief
  • Immune support
  • Helping with stomach (H. pylori) discomfort

Lactobacillus johnsonii is a probiotic bacterium found naturally in the human gut and in some fermented foods, and it is used mainly for digestive and immune support. Human evidence for most specific health claims is still limited, so its benefits are uncertain. It is generally well tolerated in healthy people, but anyone with a weakened immune system, serious illness, or who is pregnant should talk to a pharmacist or doctor first.

Lactobacillus johnsonii · Lactobacillaceae · Whole live bacteria (probiotic culture) · Capsules, tablets, powders, and fermented foods or dairy products containing the live culture

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

Lactobacillus Johnsonii: dosing

There is no official standardized dose for Lactobacillus johnsonii. Probiotic amounts are usually measured in colony-forming units (CFUs), and products vary widely.The best approach is to follow the directions on the product label and not exceed the recommended amount.

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

Read the full Lactobacillus Johnsonii monograph & all interactions
Medication

About Bacillus Calmette-Guerin

Most-Reported Side Effects for Bacillus Calmette-Guerin

From FAERS, the FDA’s public side-effect reporting system (1,749 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Product availability issue 233 reports
Bladder cancer recurrent 185 reports
Fever 79 reports
Disseminated bacillus calmette-guerin infection 70 reports
Product supply issue 66 reports
Keep checking

Other Drugs & Lactobacillus Johnsonii

Browse every other medication we’ve checked against Lactobacillus Johnsonii — 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 Lactobacillus Johnsonii page.

No interaction 2,647 drugs checked — show the list

We also checked Lactobacillus Johnsonii 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 Lactobacillus Johnsonii list.

See the full Lactobacillus Johnsonii interactions page
See every supplement checked against Bacillus Calmette-Guerin, ranked by severity
Evidence & sources

Lactobacillus Johnsonii References

The 2 references that drive our Lactobacillus Johnsonii 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. Rossi F, Amadoro C, Gasperi M, Colavita G. Lactobacilli infection case reports in the last three years and safety implications. Nutrients. 2022;14(6):1178. 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 Lactobacillus Johnsonii and Bacillus Calmette-Guerin Together: Common Questions

Is it safe to take Lactobacillus Johnsonii with Bacillus Calmette-Guerin?
We do not list a known interaction between Lactobacillus Johnsonii and Bacillus Calmette-Guerin. 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.
Does Lactobacillus Johnsonii interact with any other medications?
Yes. Lactobacillus Johnsonii has 182 documented drug interactions in our database — Bacillus Calmette-Guerin is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.

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

Where next

Keep Exploring

Lactobacillus Johnsonii monograph Uses, safety profile, and every drug interaction in one place Bacillus Calmette-Guerin supplement interactions Every supplement checked against Bacillus Calmette-Guerin, 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 2 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Bacillus Calmette-Guerin and Lactobacillus Johnsonii?

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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.