Drug & supplement interaction

Lactobacillus Crispatus + Cefotetan

Cefotetan brand name: Cefotan.

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

Lactobacillus Crispatus has a moderate interaction with Cefotetan. Theoretically, taking Lactobacillus crispatus 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

Lactobacillus Crispatus and Cefotetan

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

Moderate

ANTIBIOTIC DRUGS

Why this applies to Cefotetan

Cefotetan falls under ANTIBIOTIC DRUGS — the group Lactobacillus Crispatus interacts with.

Theoretically, taking Lactobacillus crispatus with antibiotic drugs might decrease the effectiveness of L. crispatus.
Lactobacillus crispatus 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. crispatus 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 simple version: Cefotetan is an antibiotic, and antibiotics don't pick favorites. Cefotetan works by killing bacteria, and it can't tell the difference between the bacteria causing your infection and the friendly Lactobacillus crispatus in your probiotic. So if you take them at the same time, the cefotetan may wipe out a good chunk of those live probiotic organisms before they can do their job. This won't make your cefotetan weaker or cause extra side effects. It just makes the probiotic less useful.

This is a theoretical concern based on how these products work, not something proven in big studies. A common, sensible tip is to space them out by at least two hours. If you're unsure how to time things, just ask your pharmacist.

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

Lactobacillus Crispatus Also Interacts With Other Medications

Lactobacillus Crispatus has 181 moderate known drug interactions in our database — the Cefotetan 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. Cefotetan)
Taking anything else?

Check Another of Your Medications Against Lactobacillus Crispatus

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

Everything else you take

See Every Supplement That Interacts With Cefotetan

This page covers Lactobacillus Crispatus only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Cefotetan page lists 43 supplements it has a documented interaction with, worst first, each one explained.

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

By severity: 2 major · 39 moderate · 2 minor.

From our pharmacist’s overview on the Cefotetan page

“The two kidney warnings on this cefotetan (Cefotan) list are where to start. Cefotetan is an injectable cephalosporin antibiotic, usually given in the hospital or around surgery, and two herbs here, Siberian cocklebur and asarabacca, can damage the kidneys on their own.”

Reviewed by 2 · Jul 18, 2026

Open the Cefotetan interaction page

One more smart check

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

We hold 48 real supplement products containing Lactobacillus Crispatus, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Lactobacillus Crispatus. Your product may carry other ingredients that interact with Cefotetan too, on top of Lactobacillus Crispatus — and those would not show on this page. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Lactobacillus Crispatus and Cefotetan 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 Crispatus
Steady interest

#1,076 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Cefotetan
Steady interest

#2,497 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 Lactobacillus Crispatus

What is Lactobacillus Crispatus?

  • Vaginal health support
  • Preventing recurrent bacterial vaginosis
  • Reducing recurrent urinary tract infections
  • Yeast infection support
  • General microbiome balance

Lactobacillus crispatus is a 'good' bacterium that naturally dominates a healthy vaginal microbiome and is sold as a probiotic, mainly for vaginal and urinary health. Early research is promising for preventing recurrent bacterial vaginosis and urinary tract infections, but evidence is still limited and product quality varies. Talk with your pharmacist or doctor before using it, especially if you are pregnant or have a weakened immune system.

Read the full Lactobacillus Crispatus monograph & all interactions
Medication

About Cefotetan Injection

What Is Cefotetan Injection Used For?

Brand name: Cefotan

Cefotan (cefotetan for injection) is used to treat bacterial infections including urinary tract infections, lower respiratory tract infections, skin and skin structure infections, gynecologic infections, intra-abdominal infections, and bone and joint infections — when those infections are caused by bacteria that are susceptible to cefotetan.

Cefotan is also used before certain surgeries — such as cesarean section, hysterectomy, and gastrointestinal or biliary tract surgery — to help prevent postoperative infections in procedures that carry a risk of bacterial contamination.

See full Cefotetan Injection drug information
Keep checking

Other Drugs & Lactobacillus Crispatus

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

No interaction 2,648 drugs checked — show the list

We also checked Lactobacillus Crispatus 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 Lactobacillus Crispatus list.

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

Can you take Lactobacillus Crispatus with Cefotetan?
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 Lactobacillus Crispatus and Cefotetan 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 Cefotetan and Lactobacillus Crispatus?

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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.