Drug & supplement interaction

Lacticaseibacillus Rhamnosus + Phenelzine Sulfate

Phenelzine Sulfate brand name: Nardil.

No Known Interaction
The bottom line No known interaction

We found no known interaction between Lacticaseibacillus Rhamnosus and Phenelzine Sulfate 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

Lacticaseibacillus Rhamnosus and Phenelzine Sulfate

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 Phenelzine Sulfate and Lacticaseibacillus Rhamnosus 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.

Lacticaseibacillus Rhamnosus safety at a glance

Lacticaseibacillus... overall Generally safe Generally well tolerated in healthy people, though serious infections have rarely occurred in very ill or immunocompromised individuals.
Pregnancy Possibly Safe When used orally and appropriately. Lacticaseibacillus rhamnosus GG has been used with apparent safety starting 2-4 weeks before delivery. L. rhamnosus HN001 ha... Read the full pregnancy detail
Breastfeeding Possibly Safe When used orally and appropriately. Lacticaseibacillus rhamnosus GG has been used with apparent safety when breastfeeding for up to six months and L. rhamnosus... Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center) — the full detail is in the Special populations card below. Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Phenelzine Sulfate and Lacticaseibacillus Rhamnosus? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Phenelzine Sulfate

Interactions in our licensed database are recorded against drug classes, not just single drug names. Phenelzine Sulfate is filed under 6 classifications — including monoamine oxidase inhibitors (maois), antidepressant drugs, serotonergic drugs. Lacticaseibacillus Rhamnosus has documented interactions with 1 drug class — the most serious being antibiotic drugs (moderate) — and none of Phenelzine Sulfate’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

Lacticaseibacillus Rhamnosus Does Interact With Other Medications

Lacticaseibacillus Rhamnosus has 182 moderate known drug interactions in our database — Phenelzine Sulfate isn’t one of them. If you take anything else, check it against the full list below.

Taking anything else?

Check Another of Your Medications Against Lacticaseibacillus Rhamnosus

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

What to actually watch for

What Lacticaseibacillus Rhamnosus Itself Has Been Linked To

This is not an interaction — nothing below involves Phenelzine Sulfate. It is the side-effect record for Lacticaseibacillus Rhamnosus on its own, from the licensed Natural Medicines monograph. If something new turns up after you add Lacticaseibacillus Rhamnosus, 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 Lacticaseibacillus rhamnosus preparations contain live and active microorganisms, there is some concern that they might cause pathological infection in some patients. Some lactobacilli species have been isolated in some cases of bacteremia, sepsis, splenic abscess, endocarditis, necrotizing fasciitis, pancreatic necrosis, and meningoencephalitis.”

    Lacticaseibacillus Rhamnosus · Natural Medicines adverse-effect record, reported in antibiotic-associated diarrhea.

    6 sources cited
    1. 4380. Saxelin M, Chuang NH, Chassy B, et al. Lactobacilli and bacteremia in southern Finland 1989-1992. Clin Infect Dis 1996;22:564-6. PubMed
    2. 4390. Klein G, Zill E, Schindler R, et al. Peritonitis associated with vancomycin-resistant Lactobacillus rhamnosus in a continuous ambulatory peritoneal dialysis patient; organism identification, antibiotic therapy, and case report. J Clin Microbiol 1998;36:
    3. 4391. Kalima P, Masterton RG, Roddie PH, et al. Lactobacillus rhamnosus infection in a child following bone marrow transplant. J Infect 1996;32:165-7. PubMed
    4. 4398. Rautio M, Jousimies-Somer H, Kauma H, et al. Liver abscess due to Lactobacillus rhamnosus strain indistinguishable from L. rhamnosus strain GG. Clin Infect Dis 1999;28:1159-60.
    5. 8561. MacGregor G, Smith AJ, Thakker B, Kinsella J. Yoghurt biotherapy: contraindicated in immunosuppressed patients? Postgrad Med J 2002;78:366-7. PubMed
    6. 13008. Land MH, Rouster-Stevens K, Woods CR, et al. Lactobacillus sepsis associated with probiotic therapy. Pediatrics 2005;115:178-81.
  • Mouth irritation or sores Additional detail

    “Orally, taking Lacticaseibacillus rhamnosus alone or in combination with other probiotics may cause gastrointestinal side effects including diarrhea; however, these events are uncommon. In one small clinical study in infants with suspected cow's milk allergy who were receiving extensively hydrolyzed whey formula, diarrhea occurred in 5 of 13 infants receiving non-viable, heat-killed L.”

    Lacticaseibacillus Rhamnosus · Natural Medicines adverse-effect record, reported in allergic rhinitis (hay fever).

    3 sources cited
    1. 90235. Beerepoot MA, ter Riet G, Nys S, van der Wal WM, de Borgie CA, de Reijke TM,Prins JM, Koeijers J, Verbon A, Stobberingh E, Geerlings SE. Lactobacilli vs antibiotics to prevent urinary tract infections: a randomized, double-blind, noninferiority trial in p DOI
    2. 107528. Kirjavainen PV, Salminen SJ, Isolauri E. Probiotic bacteria in the management of atopic disease: underscoring the importance of viability. J Pediatr Gastroenterol Nutr. 2003;36(2):223-7. DOI
    3. 112506. Ishihara Y, Kanda J, Tanaka K, et al. Severe oral infection due to Lactobacillus rhamnosus during induction chemotherapy for acute myeloid leukemia. Int J Hematol 2014;100(6):607-10. PubMed
  • Diarrhea Additional detail

    Recorded for Lacticaseibacillus Rhamnosus in the same Natural Medicines adverse-effect record shown under Mouth irritation or sores above.

Everything above comes from the Natural Medicines adverse-effect record for Lacticaseibacillus Rhamnosus — expand a row for the licensed statement it rests on. We read the ADVERSE REACTIONS section of Phenelzine Sulfate’s FDA label too, and the two lists don’t meaningfully overlap — which is why no Phenelzine Sulfate column appears here.

Special populations

Lacticaseibacillus Rhamnosus in Pregnancy & Breastfeeding

Pregnancy Possibly Safe

When used orally and appropriately. Lacticaseibacillus rhamnosus GG has been used with apparent safety starting 2-4 weeks before delivery. L. rhamnosus HN001 has been used from 14-16 weeks' gestation until 6 months post-delivery. The combination of L. rhamnosus with Bifidobacterium longum has been used from 2 months prior to delivery until 2 months after delivery or throughout pregnancy. The combination of L. rhamnosus GR-1 and Limosilactobacillus reuteri RC-14 has been used for up to two trimesters during pregnancy. A combination of L. rhamnosus, Lactobacillus jensenii, Lactobacillus crispatus, and Lactobacillus gasseri has been used safely for 3-4 weeks from 32-36 weeks' gestation. A meta-analysis of four clinical trials shows that taking probiotics during pregnancy increases the relative risk of pre-eclampsia by 85% when compared with placebo. Although the specific effects of L. rhamnosus are unclear from this analysis, two of the included studies used L. rhamnosus GG and one used L. rhamnosus HN001. More information is needed to determine if certain patients are at increased risk.

Lactation Possibly Safe

When used orally and appropriately. Lacticaseibacillus rhamnosus GG has been used with apparent safety when breastfeeding for up to six months and L. rhamnosus HN001 has been used from 14-16 weeks' gestation until 6 months post-delivery. A combination of L. rhamnosus and Bifidobacterium longum has been used with apparent safety from 2 months prior to delivery until 2 months after delivery.

DISCLAIMER: This tool is intended for informational purposes only, and should not be interpreted as specific medical advice. Patients should consult with a qualified healthcare provider before making decisions about therapies and/or health conditions.© 2026 Therapeutic Research Center

Everything else you take

See Every Supplement That Interacts With Phenelzine Sulfate

This page covers Lacticaseibacillus Rhamnosus only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Phenelzine Sulfate page lists 144 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: 1,4-butanediol (major), Activated Charcoal (major), Beer (major), Bitter Orange (major) and Brewer's Yeast (major).

By severity: 18 major · 111 moderate · 15 minor.

From our pharmacist’s overview on the Phenelzine Sulfate page

“Few medications demand as much dietary and supplement care as phenelzine sulfate (Nardil), an older MAOI antidepressant, and this list backs that up, with 18 of its 144 recorded interactions rated major. The two dominant themes are sedation and blood pressure.”

Reviewed by 2 · Jul 18, 2026

Open the Phenelzine Sulfate interaction page

How much people look this up

Where Lacticaseibacillus Rhamnosus and Phenelzine Sulfate 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 Lacticaseibacillus Rhamnosus
Steady interest

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

29 days ago today
Medication Phenelzine Sulfate
Top half

#1,128 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 Lacticaseibacillus Rhamnosus reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Lacticaseibacillus Rhamnosus and Phenelzine Sulfate records this page draws on were last updated July 11, 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 Lacticaseibacillus Rhamnosus

What is Lacticaseibacillus Rhamnosus?

  • Diarrhea (including antibiotic-related)
  • Digestive health
  • Vaginal and urinary health
  • Eczema and allergy prevention in children
  • Immune support

Lacticaseibacillus rhamnosus (often labeled L. rhamnosus GG) is a well-studied probiotic bacterium used mainly for diarrhea and general gut health. It is considered safe for most healthy people, with the best evidence for preventing certain types of diarrhea, but benefits for many other uses are uncertain. People who are seriously ill or have weakened immune systems should check with a doctor first.

Lacticaseibacillus rhamnosus · Lactobacillaceae · Whole live bacteria (probiotic strain) · Capsules, tablets, powders, sachets, drops, fermented dairy products (yogurt, kefir)

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

Lacticaseibacillus Rhamnosus: dosing

There is no single official dose for L. rhamnosus. Probiotic doses are usually measured in colony-forming units (CFU), and the amount used in studies varies widely by product and condition.The best approach is to follow the directions on the product label and choose a reputable brand. Because effects can depend on the specific strain, it helps to pick a product that lists the exact strain.

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

Read the full Lacticaseibacillus Rhamnosus monograph & all interactions
Medication

About Phenelzine

What Is Phenelzine Used For?

Brand name: Nardil

Phenelzine is used to treat depression — specifically the types described as atypical, nonendogenous, or neurotic depression. This often includes people who have a mix of anxiety and depression, or who have phobic or hypochondriacal features (strong fears about illness or physical symptoms).

It is generally not the first antidepressant a doctor will try. It is best suited for patients who have already tried other antidepressants without enough relief. There is less evidence supporting its use in severe depression with classic biological features (called endogenous depression).

Most-Reported Side Effects for Phenelzine Sulfate

From FAERS, the FDA’s public side-effect reporting system (1,563 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Depression 187 reports
Headache 138 reports
Anxiety 129 reports
Weight increased 122 reports
Insomnia 104 reports
See full Phenelzine drug information
Keep checking

Other Drugs & Lacticaseibacillus Rhamnosus

Browse every other medication we’ve checked against Lacticaseibacillus Rhamnosus — 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
Moderate

182 interactions

Showing 60 of 182 moderate interactions — see all 182 on the Lacticaseibacillus Rhamnosus page.

No interaction 2,647 drugs checked — show the list
Evidence & sources

Lacticaseibacillus Rhamnosus References

The 34 references that drive our Lacticaseibacillus Rhamnosus 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. Saxelin M, Chuang NH, Chassy B, et al. Lactobacilli and bacteremia in southern Finland 1989-1992. Clin Infect Dis 1996;22:564-6. PubMed
  3. Klein G, Zill E, Schindler R, et al. Peritonitis associated with vancomycin-resistant Lactobacillus rhamnosus in a continuous ambulatory peritoneal dialysis patient; organism identification, antibiotic therapy, and case report. J Clin Microbiol 1998;36:
  4. Kalima P, Masterton RG, Roddie PH, et al. Lactobacillus rhamnosus infection in a child following bone marrow transplant. J Infect 1996;32:165-7. PubMed
  5. Rautio M, Jousimies-Somer H, Kauma H, et al. Liver abscess due to Lactobacillus rhamnosus strain indistinguishable from L. rhamnosus strain GG. Clin Infect Dis 1999;28:1159-60.
  6. Rautava S, Kalliomaki M, Isolauri E. Probiotics during pregnancy and breast-feeding might confer immunomodulatory protection against atopic disease in the infant. J Allergy Clin Immunol 2002;109:119-21. PubMed
  7. Kalliomaki M, Salminen S, Arvilommi H et al. Probiotics in primary prevention of atopic disease: a randomised placebo-controlled trial. Lancet 2001;357:1076-1079. PubMed
  8. MacGregor G, Smith AJ, Thakker B, Kinsella J. Yoghurt biotherapy: contraindicated in immunosuppressed patients? Postgrad Med J 2002;78:366-7. PubMed
  9. Land MH, Rouster-Stevens K, Woods CR, et al. Lactobacillus sepsis associated with probiotic therapy. Pediatrics 2005;115:178-81.
  10. De Groote MA, Frank DN, Dowell E, et al. Lactobacillus rhamnosus GG bacteremia associated with probiotic use in a child with short gut syndrome. Pediatr Infect Dis J 2005;24:278-80. PubMed
  11. Beerepoot MA, ter Riet G, Nys S, van der Wal WM, de Borgie CA, de Reijke TM,Prins JM, Koeijers J, Verbon A, Stobberingh E, Geerlings SE. Lactobacilli vs antibiotics to prevent urinary tract infections: a randomized, double-blind, noninferiority trial in p DOI
  12. Rautava S, Kainonen E, Salminen S, Isolauri E. Maternal probiotic supplementation during pregnancy and breast-feeding reduces the risk of eczema in the infant. J Allergy Clin Immunol. 2012;130(6):1355-60. PubMed
  13. Vahabnezhad E, Mochon AB, Wozniak LJ, Ziring DA. Lactobacillus bacteremia associated with probiotic use in a pediatric patient with ulcerative colitis. J Clin Gastroenterol. 2013;47(5):437-9. PubMed
  14. Wickens KL, Barthow CA, Murphy R, et al. Early pregnancy probiotic supplementation with Lactobacillus rhamnosus HN001 may reduce the prevalence of gestational diabetes mellitus: a randomised controlled trial. Br J Nutr. 2017;117(6):804-813.
  15. Topcuoglu S, Gursoy T, Ovali F, Serce O, Karatekin G. A new risk factor for neonatal vancomycin-resistant Enterococcus colonisation: bacterial probiotics. J Matern Fetal Neonatal Med. 2015;28(12):1491-4. 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 Lacticaseibacillus Rhamnosus and Phenelzine Sulfate Together: Common Questions

Is it safe to take Lacticaseibacillus Rhamnosus with Phenelzine Sulfate?
We do not list a known interaction between Lacticaseibacillus Rhamnosus and Phenelzine Sulfate. 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.
How was the Lacticaseibacillus Rhamnosus and Phenelzine Sulfate combination checked?
Interactions in our licensed database are recorded against drug classes. Phenelzine Sulfate is filed under 6 classifications, and Lacticaseibacillus Rhamnosus has documented interactions with 1 drug class — none of Phenelzine Sulfate'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 Lacticaseibacillus Rhamnosus interact with any other medications?
Yes. Lacticaseibacillus Rhamnosus has 182 documented drug interactions in our database — Phenelzine Sulfate 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 Phenelzine Sulfate interact with any supplements?
Yes. Phenelzine Sulfate has documented interactions with 144 supplements in our database — Lacticaseibacillus Rhamnosus is not one of them. The Phenelzine Sulfate interaction page linked on this page lists every one, ranked by severity.

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

Still Have a Question About Phenelzine Sulfate and Lacticaseibacillus Rhamnosus?

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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.