Drug & supplement interaction

Limosilactobacillus Reuteri + Telithromycin

Telithromycin brand name: Ketek.

Moderate Interaction
Medically reviewed by · Updated September 2026
The bottom line Moderate

Limosilactobacillus Reuteri has a moderate interaction with Telithromycin. Theoretically, taking Limosilactobacillus reuteri with antibiotic drugs might decrease the effectiveness of L.

Read the full interaction report
SeverityModerate
LikelihoodProbable
EvidenceD
What do Severity, Likelihood & Evidence mean?
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Interaction report

Limosilactobacillus Reuteri and Telithromycin

Here is the interaction we found between these two, with the evidence behind it.

Moderate

ANTIBIOTIC DRUGS

Why this applies to Telithromycin

Telithromycin falls under ANTIBIOTIC DRUGS — the group Limosilactobacillus Reuteri interacts with.

Theoretically, taking Limosilactobacillus reuteri with antibiotic drugs might decrease the effectiveness of L. reuteri.
L. reuteri preparations usually contain live and active organisms. Therefore, simultaneously taking antibiotics might kill a significant number of the organisms. Tell patients to separate administration of antibiotics and L. reuteri preparations by at least two hours.
Severity Moderate Likelihood Probable Evidence D

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..

Dr. Brian Staiger, PharmD, BCPS
Dr. Brian Staiger explains PharmD, Clinical Pharmacist

Here's the thing to keep in mind: telithromycin (Ketek) is an antibiotic, and L. reuteri is a live probiotic bacterium. If you swallow them at the same time, the antibiotic can kill off a good chunk of those living probiotic organisms before they ever reach your gut. So this interaction goes one direction only: it can make the probiotic less effective. It does not change how well telithromycin fights your pneumonia, and it won't make the antibiotic stronger or weaker.

This is a theory based on how the two work together, not something proven in studies, so don't worry. A simple fix is to space them out by at least two hours. Check with your pharmacist if you'd like help timing the doses.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Pierce A. The American Pharmaceutical Association Practical Guide to Natural Medicines. New York: The Stonesong Press, 1999:19.

What These Ratings Mean

Every interaction above is graded three ways — here’s the key to each label.

Severity how clinically significant the interaction is
Major

Clinically significant. Avoid the combination, or use only under close professional supervision.

Moderate

Usually worth avoiding or managing — may need monitoring, a dose change, or timing apart.

Minor

Generally not serious. Be aware of it and mention it to your pharmacist.

Likelihood how strong the evidence is that the interaction actually happens in people
  • LikelyWell-controlled human studies have demonstrated the likely existence of this interaction.
  • ProbableInteraction 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.
  • PossibleInteraction 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.
  • UnlikelyInteraction has been demonstrated in animal or in lab research but has been shown not to occur in humans.
Evidence the quality of the studies behind the rating (graded A–D)
  • AHigh-quality meta-analysis (quantitative systematic review).
  • BCase-control study.
  • CConsensus.
  • DAnecdotal evidence.

These ratings are for information only. Never start, stop, or otherwise change your therapy before speaking with your provider.

Keep it in perspective

Limosilactobacillus Reuteri Also Interacts With Other Medications

Limosilactobacillus Reuteri has 181 moderate known drug interactions in our database — the Telithromycin one above is one of them. If you take anything else, check it against the full list below.

Moderate 181 No known interaction 2,649 (incl. Telithromycin)
Taking anything else?

Check Another of Your Medications Against Limosilactobacillus Reuteri

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

Everything else you take

See Every Supplement That Interacts With Telithromycin

This page covers Limosilactobacillus Reuteri only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Telithromycin page lists 178 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), American Hellebore (major), Arsenic (major), Cesium (major) and Ephedra (major).

By severity: 8 major · 130 moderate · 40 minor.

From our pharmacist’s overview on the Telithromycin page

“Someone prescribed telithromycin (Ketek) usually has a stubborn respiratory infection and takes it for a week or so, but that short course still calls for real vigilance with supplements. Eight of the 178 ingredients on file are rated major, and those deserve attention first.”

Reviewed by 2 · Jul 18, 2026

Open the Telithromycin interaction page

How much people look this up

Where Limosilactobacillus Reuteri and Telithromycin 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 Limosilactobacillus Reuteri
Steady interest

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

29 days ago today
Medication Telithromycin
Top half

#1,404 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.

Supplement

About Limosilactobacillus Reuteri

What is Limosilactobacillus Reuteri?

  • Infant colic
  • Diarrhea (including antibiotic-associated)
  • Digestive health
  • Oral and gum health
  • Constipation
  • Immune support

Limosilactobacillus reuteri (formerly Lactobacillus reuteri) is a probiotic bacterium found in the human gut and certain fermented foods. It has the most supportive evidence for reducing crying in breastfed infants with colic and for some types of diarrhea, while many other uses remain unproven. It is generally well tolerated in healthy people, but people who are very ill or immunocompromised should talk to a doctor first.

Read the full Limosilactobacillus Reuteri monograph & all interactions
Medication

About Telithromycin

What Is Telithromycin Used For?

Brand name: Ketek

  • Telithromycin is used to treat certain types of pneumonia (an infection of the lungs) that is caused by bacteria. Telithromycin is in a class of medications called ketolide antibiotics. It works by killing bacteria.

  • Antibiotics such as telithromycin not work for colds, flu, or other viral infections. Taking antibiotics when they are not needed increases your risk of getting an infection later that resists antibiotic treatment.

See full Telithromycin drug information
Keep checking

Other Drugs & Limosilactobacillus Reuteri

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

0Major
181Moderate
0Minor
2,648No known interaction
181 Moderate 2,648 No interaction
Moderate

181 interactions

Showing 60 of 181 moderate interactions — see all 181 on the Limosilactobacillus Reuteri page.

No interaction 2,648 drugs checked — show the list

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

Showing the 60 most looked-up of 2,648 medications checked with no known interaction — see the full Limosilactobacillus Reuteri list.

See the full Limosilactobacillus Reuteri interactions page
See every supplement checked against Telithromycin, ranked by severity
Sources

Sources & How We Checked

Interaction details are evidence-graded and sourced from the Natural Medicines database. The medication overview comes from MedlinePlus.

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
Limosilactobacillus Reuteri monograph › Uses, safety, and every drug interaction in one place Telithromycin supplement interactions › Every supplement checked against Telithromycin, ranked by severity Telithromycin 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 Limosilactobacillus Reuteri and Telithromycin Together: Common Questions

Can you take Limosilactobacillus Reuteri with Telithromycin?
There is a moderate interaction, so it may be acceptable with monitoring or timing changes — but check with your pharmacist first. Read the full details on this page and confirm with your pharmacist before combining them.
How serious is the Limosilactobacillus Reuteri and Telithromycin interaction?
We rate it Moderate. This combination may require monitoring, a dose adjustment, or separating the times you take each one. Consult your pharmacist before using them together.

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

Still Have a Question About Telithromycin and Limosilactobacillus Reuteri?

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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.