Drug & supplement interaction

Lactobacillus Helveticus + Pemetrexed

Pemetrexed brand names: Alimta, Pemfexy.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Sep 20, 2026
The bottom line No known interaction

We found no known interaction between Lactobacillus Helveticus and Pemetrexed 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. Additionally, although there is no interaction, the two are separately associated with some of the same side effects, which would make a new symptom harder to attribute to one or the other.

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Interaction report

Lactobacillus Helveticus and Pemetrexed

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 Pemetrexed and Lactobacillus Helveticus 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 Helveticus safety at a glance

Lactobacillus Helv... overall Use caution Generally well tolerated in healthy people, but people who are seriously ill or immunocompromised should be cautious.
Pregnancy Use caution Not enough reliable safety data; use only with your doctor's guidance.
Breastfeeding Use caution Limited safety information, so check with your doctor before use.

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

Still wondering about combining Pemetrexed and Lactobacillus Helveticus? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Pemetrexed

Interactions in our licensed database are recorded against drug classes, not just single drug names. Pemetrexed is filed under a single classification — organic anion transporter 3 (oat3) substrates. Lactobacillus Helveticus has documented interactions with 1 drug class — the most serious being antibiotic drugs (moderate) — and none of Pemetrexed’s classifications are among them.

Classification data comes from our licensed Natural Medicines dataset. A medication can belong to classes beyond those recorded there, so this describes how the check was run — it is not a safety guarantee.

Keep it in perspective

Lactobacillus Helveticus Does Interact With Other Medications

Lactobacillus Helveticus has 182 moderate known drug interactions in our database — Pemetrexed 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. Pemetrexed)
Taking anything else?

Check Another of Your Medications Against Lactobacillus Helveticus

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

What to actually watch for

No Interaction Found — But Data Suggests Lactobacillus Helveticus and Pemetrexed May Share a Side Effect

This is not an interaction. Neither one changes how your body handles the other, and nothing here says they react together. What our sources do show is that each has separately been linked to the effects below — so taking both can make those effects more likely to turn up, and harder to pin on one or the other if they do. One of them is worth acting on rather than waiting out — marked below.

  • A higher chance of infection Worth acting on Additional detail

    Lactobacillus Helveticus

    “Since Lactobacillus helveticus 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 Helveticus · 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

    Pemetrexed

    Listed in the ADVERSE REACTIONS section of the FDA label for Pemetrexed. Read the label on DailyMed ›

Effects for Pemetrexed come from the ADVERSE REACTIONS section of its FDA label; effects for Lactobacillus Helveticus come from the Natural Medicines adverse-effect record, quoted above. Wording is matched across sources by our own clinical vocabulary, so treat this as a prompt to pay attention, not a diagnosis.

Everything else you take

See Every Supplement That Interacts With Pemetrexed

This page covers Lactobacillus Helveticus only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Pemetrexed page lists 4 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: African Wild Potato (moderate), Banderol (moderate), Caffeic Acid (moderate) and Quercetin (moderate).

By severity: 4 moderate.

From our pharmacist’s overview on the Pemetrexed page

“Every supplement on file for pemetrexed (Alimta, Pemfexy) works the same way. Each can slow how the kidneys pull the drug out of the blood, which would let it linger and build to higher levels than intended.”

Reviewed by 2 · Jul 18, 2026

Open the Pemetrexed interaction page

One more smart check

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

We hold 530 real supplement products containing Lactobacillus Helveticus, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Lactobacillus Helveticus. Even though Lactobacillus Helveticus itself has no known interaction with Pemetrexed, 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 Helveticus and Pemetrexed 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 Helveticus
Top half

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

29 days ago today
Medication Pemetrexed
Top half

#1,332 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 Helveticus reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Lactobacillus Helveticus and Pemetrexed 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 Helveticus

What is Lactobacillus Helveticus?

  • Mood and stress support
  • Digestive and gut health
  • Sleep support
  • General immune support
  • Blood pressure support

Lactobacillus helveticus is a lactic acid bacterium used as a probiotic, often combined with other strains in mood, gut, and general wellness products. Early research is interesting—especially for stress and mood and for fermented-milk peptides and blood pressure—but evidence is still limited and not conclusive. It is generally well tolerated in healthy people, but talk to your pharmacist or doctor before using it, especially if you have a weakened immune system.

Lactobacillus helveticus · Lactobacillaceae · Live bacterial cultures (probiotic strain) · Capsules, tablets, powders, fermented dairy products (such as some cheeses and milk drinks); often combined with other probiotic strains

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

Lactobacillus Helveticus: dosing

There is no official standardized dose for L. helveticus. Probiotic products are usually measured in colony-forming units (CFU), and different products contain very different amounts and strain combinations.The best approach is to follow the directions on the product label and choose a reputable brand that lists the specific strain and CFU count.

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

Read the full Lactobacillus Helveticus monograph & all interactions
Medication

About Pemetrexed Injection

What Is Pemetrexed Injection Used For?

Brand names: Alimta, Pemfexy

Pemetrexed Injection is used for non-squamous non-small cell lung cancer (NSCLC) in several situations: as an initial treatment (combined with pembrolizumab and platinum chemotherapy, or with cisplatin alone), as a maintenance treatment after platinum-based chemotherapy, or as a single agent when the cancer has come back after prior chemotherapy. It is not used for squamous cell non-small cell lung cancer.

Pemetrexed Injection is also used, in combination with cisplatin, for the initial treatment of malignant pleural mesothelioma — a cancer of the lining of the lungs — in patients whose disease cannot be surgically removed or who are not good candidates for surgery.

Most-Reported Side Effects for Pemetrexed

From FAERS, the FDA’s public side-effect reporting system (37,889 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Malignant neoplasm progression 3,095 reports
Anemia 2,134 reports
Nausea 1,906 reports
Diarrhea 1,824 reports
Pancytopenia 1,773 reports
See full Pemetrexed Injection drug information
Keep checking

Other Drugs & Lactobacillus Helveticus

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

No interaction 2,647 drugs checked — show the list

We also checked Lactobacillus Helveticus 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 Helveticus list.

See the full Lactobacillus Helveticus interactions page
See every supplement checked against Pemetrexed, ranked by severity
Evidence & sources

Lactobacillus Helveticus References

The 2 references that drive our Lactobacillus Helveticus 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 Helveticus and Pemetrexed Together: Common Questions

Is it safe to take Lactobacillus Helveticus with Pemetrexed?
We do not list a known interaction between Lactobacillus Helveticus and Pemetrexed. 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.
Do Lactobacillus Helveticus and Pemetrexed have any of the same side effects?
Yes — our sources link each of them separately to one of the same effects. That is not an interaction: neither changes how your body handles the other. It does mean that if one of those effects turns up, it can be harder to tell which one is behind it. They are listed on this page with the source behind each.
How was the Lactobacillus Helveticus and Pemetrexed combination checked?
Interactions in our licensed database are recorded against drug classes. Pemetrexed is filed under 1 classification, and Lactobacillus Helveticus has documented interactions with 1 drug class — none of Pemetrexed's classifications are among them. A medication can belong to classes beyond those recorded in our dataset, so this describes how the check was run rather than guaranteeing safety.
Does Lactobacillus Helveticus interact with any other medications?
Yes. Lactobacillus Helveticus has 182 documented drug interactions in our database — Pemetrexed is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.
Does Pemetrexed interact with any supplements?
Yes. Pemetrexed has documented interactions with 4 supplements in our database — Lactobacillus Helveticus is not one of them. The Pemetrexed interaction page linked on this page lists every one, ranked by severity.

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

Where next

Keep Exploring

Lactobacillus Helveticus monograph Uses, safety profile, and every drug interaction in one place Pemetrexed Injection drug information The full plain-English guide to this medication Pemetrexed supplement interactions Every supplement checked against Pemetrexed, 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 Pemetrexed and Lactobacillus Helveticus?

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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.