Drug & supplement interaction

Lactiplantibacillus Plantarum + Cefadroxil

Cefadroxil brand names: Duricef, Ultracef, Cef-Tab.

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

Lactiplantibacillus Plantarum has a moderate interaction with Cefadroxil. Theoretically, taking Lactiplantibacillus plantarum 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

Lactiplantibacillus Plantarum and Cefadroxil

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

Moderate

ANTIBIOTIC DRUGS

Why this applies to Cefadroxil

Cefadroxil falls under ANTIBIOTIC DRUGS — the group Lactiplantibacillus Plantarum interacts with.

Theoretically, taking Lactiplantibacillus plantarum with antibiotic drugs might decrease the effectiveness of L. plantarum.
L. plantarum 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. plantarum 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: cefadroxil is an antibiotic, so it doesn't care whether bacteria are the 'bad guys' causing your infection or the 'friendly' ones in your probiotic. If you swallow your L. plantarum capsule at the same time as your cefadroxil, the antibiotic can wipe out a good chunk of those live organisms, so you may not get much benefit from the probiotic. The good news is this works in only one direction. Your cefadroxil keeps fighting your infection just fine, so don't worry about it being weakened.

This is more of a theory based on how these two work together, not a dangerous reaction. A simple fix is to space them out by at least two hours. Run the timing by your pharmacist if you're unsure.

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

Lactiplantibacillus Plantarum Also Interacts With Other Medications

Lactiplantibacillus Plantarum has 181 moderate known drug interactions in our database — the Cefadroxil 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. Cefadroxil)
Taking anything else?

Check Another of Your Medications Against Lactiplantibacillus Plantarum

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

Everything else you take

See Every Supplement That Interacts With Cefadroxil

This page covers Lactiplantibacillus Plantarum only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Cefadroxil page lists 60 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Asarabacca (major), Siberian Cocklebur (major), African Wild Potato (moderate) and Aristolochia (moderate).

By severity: 3 major · 46 moderate · 11 minor.

From our pharmacist’s overview on the Cefadroxil page

“Cefadroxil, a cephalosporin antibiotic usually taken as a short course for skin, throat, or urinary infections, has a supplement list that deserves genuine care, not a quick skim. Three of the 60 ingredients on file rate major.”

Reviewed by 2 · Jul 18, 2026

Open the Cefadroxil interaction page

How much people look this up

Where Lactiplantibacillus Plantarum and Cefadroxil 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 Lactiplantibacillus Plantarum
Steady interest

#1,418 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Cefadroxil
Top 25%

#589 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 Lactiplantibacillus Plantarum

What is Lactiplantibacillus Plantarum?

  • Digestive health and regularity
  • Irritable bowel syndrome (IBS) symptoms
  • Bloating and gas
  • Immune support
  • Restoring gut bacteria after antibiotics

Lactiplantibacillus plantarum is a 'friendly' bacterium (probiotic) found in fermented foods and many supplements, studied mainly for digestive health. It is generally well tolerated in healthy people, but evidence is mixed and strain-specific, so benefits are not guaranteed. Talk to your pharmacist or doctor before starting, especially if you have a weakened immune system.

Read the full Lactiplantibacillus Plantarum monograph & all interactions
Medication

About Cefadroxil

What Is Cefadroxil Used For?

Brand names: Duricef, Ultracef, Cef-Tab

Cefadroxil treats bacterial infections caused by susceptible (antibiotic-sensitive) germs. It is approved for urinary tract infections, skin and skin structure infections, and pharyngitis or tonsillitis caused by Group A strep (Streptococcus pyogenes).

It should only be used for infections proven or strongly suspected to be caused by bacteria that respond to it. Taking it for viruses (like a cold or flu) will not work and contributes to antibiotic resistance.

See full Cefadroxil drug information
Keep checking

Other Drugs & Lactiplantibacillus Plantarum

Browse every other medication we’ve checked against Lactiplantibacillus Plantarum — 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 Lactiplantibacillus Plantarum page.

No interaction 2,648 drugs checked — show the list

We also checked Lactiplantibacillus Plantarum 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 Lactiplantibacillus Plantarum list.

See the full Lactiplantibacillus Plantarum interactions page
See every supplement checked against Cefadroxil, 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
Lactiplantibacillus Plantarum monograph › Uses, safety, and every drug interaction in one place Cefadroxil supplement interactions › Every supplement checked against Cefadroxil, ranked by severity Cefadroxil 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 Lactiplantibacillus Plantarum and Cefadroxil Together: Common Questions

Can you take Lactiplantibacillus Plantarum with Cefadroxil?
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 Lactiplantibacillus Plantarum and Cefadroxil 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 Cefadroxil and Lactiplantibacillus Plantarum?

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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.