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Dietary supplement

Dual Action Acidophilus & Bifidus Ingredients & Drug Interactions

by Vitamer Laboratories

Dual Action Acidophilus & Bifidus label
See full label image
Capsule Category: Non-nutrient/non-botanical
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 16, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Dual Action Acidophilus & Bifidus against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.

Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy

The interaction bottom line Most serious interaction: Moderate

Dual Action Acidophilus & Bifidus is a dietary supplement by Vitamer Laboratories with 2 active ingredients. Its ingredients are commonly taken for digestive health and balance, diarrhea (including antibiotic-related), vaginal yeast and bacterial infections.Based on those ingredients, 182 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Lactobacillus acidophilus. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against Dual Action Acidophilus & Bifidus by Vitamer Laboratories

Ask about any prescription or over-the-counter medication and we check it for interactions with Dual Action Acidophilus & Bifidus by Vitamer Laboratories — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Dual Action Acidophilus & Bifidus by Vitamer Laboratories

Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.

From our pharmacy team — supplement deep dive

Generated from HelloPharmacist’s pharmacist-curated databases and editorial rules · Last generated Jul 23, 2026

What’s inside

Low disclosure
Ingredient Transparency · database check
Low

Most active ingredients don't disclose an individual amount — you can't tell how much of each you're getting.

Why this rating?
  • The label discloses an exact amount for 0 of its 2 active ingredients.
  • “Blend (Non-Nutrient/Non-Botanical)” is a proprietary blend — the label doesn't break down how much of each component you get.

This product contains 2 active ingredients: Lactobacillus acidophilus and Bifidobacterium infantis, both live beneficial bacteria (probiotics) meant to support digestive and gut health. The capsule also contains inactive ingredients—cellulose, maltodextrin, dextrose, magnesium stearate, silica, and the capsule material itself—which are fillers and binders used to hold the formula together.

Does it work?

Moderate evidence
Evidence for Intended Use · database check
By FDA rules, dietary supplements can’t claim to treat, cure, or prevent disease — so labels speak in careful marketing language. We discern each product’s intended use from its name, label claims, and label statements, then grade the clinical evidence for that use. How these ratings are computed
Moderate

Some clinical evidence supports this product's ingredients for its stated purpose, but it isn't conclusive.

Why this rating?
  • The label markets this product for: restore and maintain intestinal flora.
  • We looked for evidence on: Antibiotic-associated diarrhea, Bacterial vaginosis, Clostridioides difficile infection, Colic, Constipation, Inflammatory bowel disease (IBD) — and 4 related terms.
  • The strongest evidence on file: Lactobacillus Acidophilus is rated "Possibly Effective" for Antibiotic-associated diarrhea (Natural Medicines).
  • Also on file: Lactobacillus Acidophilus is rated "Possibly Effective" for Bacterial vaginosis, Irritable bowel syndrome (IBS).
  • Also on file: Lactobacillus Acidophilus is rated "Insufficient Reliable Evidence To Rate" for Constipation, Inflammatory bowel disease (IBD), Lactose intolerance, Necrotizing enterocolitis (NEC).

L. acidophilus is possibly effective for irritable bowel syndrome (IBS), Helicobacter pylori infection, antibiotic-associated diarrhea, and bacterial vaginosis based on the evidence we hold. It's rated possibly ineffective for atopic disease (allergic conditions), and we don't have enough reliable evidence to rate it for acute respiratory distress syndrome.

The effectiveness data for Bifidobacterium infantis isn't on file for us to review.

The evidence, ingredient by ingredient Lactobacillus Acidophilus

How safe is it?

Well-documented data
Safety Information · database check
Well characterized

Adverse-effect, pregnancy, and general safety data are on file for most of these ingredients.

Why this rating?
  • We hold adverse-effect (side-effect) data for 1 of the 1 matched ingredient.
  • Pregnancy & breastfeeding safety ratings cover 1 of 1.
  • General safety write-ups exist for 1 of 1.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Lactobacillus acidophilus is generally well tolerated in healthy adults and children. Because it contains live organisms, there's a theoretical concern it could cause infection in rare cases, though most reported infections occurred when bacteria traveled from elsewhere in the body rather than from the supplement itself.

Mild gastrointestinal side effects like bloating, gas, abdominal discomfort, or diarrhea are uncommon but possible, especially when combined with other probiotics. A clinical trial reported a couple of rash cases, though it's unclear whether they came from L. acidophilus or something else.

For Bifidobacterium infantis, pregnancy safety data isn't on file for us.

Side effects, ingredient by ingredient Lactobacillus Acidophilus

Meds to double-check

Moderate interaction found
Known Interaction Concern · database check
Moderate identified

The most serious documented interaction for these ingredients is Moderate. Check your medications for a personalized result.

Why this rating?
  • 1 of the 1 matched ingredient can interact with medications — Lactobacillus Acidophilus.
  • The most serious interaction on file is rated Moderate.
  • For scale: 182 individual medications appear in the full list. A big number alone doesn't make a product dangerous — what matters is whether YOUR medication is on it, so run yours through the interaction checker on this page.

Check your antibiotic medications before starting this product. Antibiotics taken together with Lactobacillus acidophilus can reduce how well the probiotic works.

Your doctor or pharmacist can advise you on how far apart to space them.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFormula with limited ingredient disclosure with some supporting evidence for its stated purpose. Moderate medication interactions have been identified, and safety information is well characterized.

This probiotic may help if you have IBS, antibiotic-related diarrhea, or certain infections, though the evidence is modest. The key is timing—don't take it at the same time as antibiotics, because they'll interfere with each other.

If you take any antibiotics or have a weakened immune system, check with your doctor or pharmacist before starting.

Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI

Assessment coverage: 1 of 2 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Dec 23, 2016.

This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed

At a glance

General information

Key facts about Dual Action Acidophilus & Bifidus, straight from the product label.

Brand Vitamer Laboratories
Barcode (UPC) 719985716287
Net contents 50 Capsule(s)
Market status On market
Date entered into DSLD Dec 23, 2016
DSLD ID 69022
Product type Non-nutrient/non-botanical
Supplement form Capsule
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Adult (18 - 50 Years), Gluten Free, Dairy Free
From the label
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.

Supplement Facts

The label details for Dual Action Acidophilus & Bifidus by Vitamer Laboratories, sourced from the NIH Dietary Supplement Label Database.

Supplement Facts

Daily Value (DV) Target Group(s):
Adults and children 4 or more years of age
Minimum serving Sizes:
1 Capsule(s)
Maximum serving Sizes:
1 Capsule(s)
Servings per container
50
UPC/BARCODE
719985716287
IngredientAmount% DV
Lactobacillus acidophilus0 NP--
Bifidobacterium infantis0 NP--
Blend (Non-Nutrient/Non-Botanical)0 NP--

Other ingredients: Capsule, Cellulose, Maltodextrin, Dextrose, Magnesium Stearate, Silica

Tap any ingredient to jump to its full detail below.

Label statements
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
Brand IP Statement(s)

Our Dual Action Acidophilus & Bifidus capsules have a unique matrix that forms a gel at the surface, protecting the probiotic bacteria until they reach the small intestine where they are released in their full, biologically active state.

Formula

Each capsule contains equal parts of acidophilus and bifidus, and contains one billion viable bacterial cells at time of manufacture.

Storage

What's more, while this product doesn't require refrigeration - making it convenient for travel, work, and outdoor activities - storing it in a refrigerator is recommended to extend the potency. Store in a cool, dry place if not refrigerated.

General Statements

We guarantee our supplements for potency and purity

Assists in restoring and maintaining intestinal flora

Acidophilus and bifidus are probiotics naturally found in a healthy intestinal tract. They provide beneficial bacteria needed for restoring and balancing intestinal flora in both the upper and lower gastrointestinal tracts.

FDA Disclaimer Statement

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

FDA Statement of Identity

Dietary Supplement

Seals/Symbols

Double Verified Gluten Free

Suggested/Recommended/Usage/Directions

Suggested Use: Take one capsule up to three times daily, preferably before meals with a glass of water.

Formulation

Contains no artificial colors, flavors or preservatives; no wheat, gluten, eggs, peanuts, tree nuts, soy, milk, crustacean shellfish or fish.

Precautions

Keep out of reach of children.

General

VVL 716-50R

Is this label outdated? Report a formula or label change and our pharmacy team will review it.

See for yourself

Dual Action Acidophilus & Bifidus by Vitamer Laboratories label

The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.

Dual Action Acidophilus & Bifidus label

Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.

View the full label (PDF)
What’s inside

The Ingredients in Dual Action Acidophilus & Bifidus by Vitamer Laboratories

These are the 2 active ingredients this product is made of. Select any to open its full monograph.

Serving size1 Capsule(s) Dosage formCapsule Servings per container50 Amounts shown are per serving.

Most supplement products combine several ingredients, and a medication can interact with the product through any one of them. Each ingredient below shows whether it has known drug interactions.

Blend (Non-Nutrient/Non-Botanical)

0 NP per serving

Other (inactive) ingredients: Capsule, Cellulose, Maltodextrin, Dextrose, Magnesium Stearate, Silica. These complete the product’s ingredient list but are not active constituents.

Interaction report

Dual Action Acidophilus & Bifidus by Vitamer Laboratories Drug Interactions

Want to check YOUR meds against Dual Action Acidophilus & Bifidus?

Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.

 Go to the checker
182Drugs
182 Moderate

Ingredients driving the most interactions

Lactobacillus acidophilus 182

Individual Drug Interactions

The ingredients in Dual Action Acidophilus & Bifidus interact with 182 drugs. Click any drug to see the details.

1 of the 2 ingredients in Dual Action Acidophilus & Bifidus interact with drugs. Each result below shows which ingredient is responsible. Lactobacillus acidophilus

Each ingredient & the kinds of drugs it affects

For each ingredient in Dual Action Acidophilus & Bifidus with known interactions, here are the types of medications it can affect. Open any type for the detail — or search your exact drug in the checker above.

Lactobacillus acidophilus1 drug type · 182 drugs

Antibiotic Drugs

Theoretically, taking Lactobacillus acidophilus with antibiotic drugs might decrease the effectiveness of L. acidophilus.
L. acidophilus 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. acidophilus preparations by at least two hours.

Likelihood Probable Evidence D
Lactobacillus acidophilus full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Dual Action Acidophilus & Bifidus, from the product label.

Vitamer Laboratories

See all Vitamer Laboratories products
Phone Number
1-888-710-0006
Pharmacist Counseling Corner

Dual Action Acidophilus & Bifidus by Vitamer Laboratories: Common Questions

Does Dual Action Acidophilus & Bifidus by Vitamer Laboratories interact with any medications?
Yes. Based on its ingredients, Dual Action Acidophilus & Bifidus has a known interaction with 182 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Dual Action Acidophilus & Bifidus contains 2 active ingredients, and an interaction can come from any of them. We check every ingredient, combine the results into one list per medication, and show which ingredient and mechanism is responsible.
Where does this information come from?
The product label data comes from the NIH Dietary Supplement Label Database (DSLD); the interaction data is built on the Natural Medicines database and reviewed by HelloPharmacist pharmacists.
Can I take this while I'm on antibiotics?
Not at the same time. Antibiotics kill the live bacteria in the supplement, making it less effective. Separate your doses by several hours and talk with your doctor or pharmacist about the best timing for your specific antibiotic.
What are these probiotics supposed to do?
Lactobacillus acidophilus is possibly effective for irritable bowel syndrome, antibiotic-associated diarrhea, Helicobacter pylori infection, and bacterial vaginosis. Bifidobacterium infantis is included to support digestive health, though we don't have effectiveness data on file for it.
Are there any side effects?
Most people tolerate it well. Uncommon side effects include mild gas, bloating, abdominal discomfort, or loose stool, especially when combined with other probiotics. In one trial, a couple of people reported rash, though it's unclear if that came from this product.
Is it safe if I'm pregnant?
Lactobacillus acidophilus is rated possibly safe in pregnancy, but data are limited. We don't have safety information on file for Bifidobacterium infantis. Talk with your doctor or pharmacist about whether to use it during pregnancy.
Who shouldn't take this?
People with a weakened immune system should check with their doctor first, since there's a rare theoretical risk of infection from live organisms in the supplement. If you're on antibiotics, separate the doses and talk with your pharmacist about timing.

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

Not sure if Dual Action Acidophilus & Bifidus is safe with your meds?

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Label information is sourced from the NIH Dietary Supplement Label Database and reflects the product version on file; always read your actual product label. This page is for education only and is not a substitute for professional medical advice. Confirm with your pharmacist or doctor before combining supplements and medications.

Dual Action Acidophilus & Bifidus label
Go deeper

The Full Monographs Behind Dual Action Acidophilus & Bifidus’s Ingredients

Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.

Herb & supplement monograph

Lactobacillus Acidophilus

Interacts with 182 drugs

Lactobacillus acidophilus is a 'friendly' bacterium used as a probiotic to support gut and vaginal health. It is generally well tolerated in healthy people, and there is reasonable evidence...

Read the full Lactobacillus Acidophilus monograph →
Sources

Sources & How We Checked

Dual Action Acidophilus & Bifidus's label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

The 15 references behind this product’s interaction data

Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.

Lactobacillus Acidophilus 15 references
  1. Pierce A. The American Pharmaceutical Association Practical Guide to Natural Medicines. New York: The Stonesong Press, 1999:19.
  2. Begtrup LM, de Muckadell OB, Kjeldsen J, Christensen RD, Jarbøl DE. Long-term treatment with probiotics in primary care patients with irritable bowel syndrome--a randomised, double-blind, placebo controlled trial. Scand J Gastroenterol 2013;48(10):1127-35 PubMed
  3. Chatterjee S, Kar P, Das T, Ray S, Gangulyt S, Rajendiran C, Mitra M. Randomised placebo-controlled double blind multicentric trial on efficacy and safety of Lactobacillus acidophilus LA-5 and Bifidobacterium BB-12 for prevention of antibiotic-associated
  4. Shavakhi A, Tabesh E, Yaghoutkar A, Hashemi H, Tabesh F, Khodadoostan M,Minakari M, Shavakhi S, Gholamrezaei A. The effects of multistrain probiotic compound on bismuth-containing quadruple therapy for Helicobacter pylori infection: a randomized placebo-c
  5. Karamali M, Dadkhah F, Sadrkhanlou M, et al. Effects of probiotic supplementation on glycaemic control and lipid profiles in gestational diabetes: a randomized, double-blind, placebo-controlled trial. Diabetes Metab 2016;42(4):234-41. PubMed
  6. Badehnoosh B, Karamali M, Zarrati M, et al. The effects of probiotic supplementation on biomarkers of inflammation, oxidative stress and pregnancy outcomes in gestational diabetes. J Matern Fetal Neonatal Med. 2018 May;31(9):1128-1136.
  7. Kumar S, Kumar R, Rohilla L, Jacob N, Yadav J, Sachdeva N. A high potency multi-strain probiotic improves glycemic control in children with new-onset type 1 diabetes mellitus: A randomized, double-blind, and placebo-controlled pilot study. Pediatr Diabete
  8. Shahriari A, Karimi E, Shahriari M, Aslani N, Khooshideh M, Arab A. The effect of probiotic supplementation on the risk of gestational diabetes mellitus among high-risk pregnant women: A parallel double-blind, randomized, placebo-controlled clinical trial PubMed
  9. Xiao SD, Zhang DZ, Lu H, et al. Multicenter, randomized, controlled trial of heat-killed Lactobacillus acidophilus LB in patients with chronic diarrhea. Adv Ther. 2003;20(5):253-60.
  10. 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
  11. Ozer M, Goksu SY, Shahverdiani A, Mustafa M. Lactobacillus acidophilus-induced endocarditis and associated splenic abscess. Case Rep Infect Dis 2020;2020:1382709.
  12. Sadrin S, Sennoune S, Gout B, et al. A 2-strain mixture of Lactobacillus acidophilus in the treatment of irritable bowel syndrome: A placebo-controlled randomized clinical trial. Dig Liver Dis 2020;52(5):534-540. PubMed
  13. Stoffer JN, Slingsby TJ, Giuliari GP. Lactobacillus acidophilus endophthalmitis after intravitreal bevacizumab injection requiring intraocular lens explantation. Can J Ophthalmol 2022;57(1):e21-e22. PubMed
  14. Cukovic-Cavka S, Likic R, Francetic I, Rustemovic N, Opacic M, Vucelic B. Lactobacillus acidophilus as a cause of liver abscess in a NOD2/CARD15-positive patient with Crohn's disease. Digestion 2006;73(2-3):107-10.
  15. Hui J, Ren Y, Wang Y, Han Q. Lactobacillus acidophilus endophthalmitis postcataract operation: A case report with a literature review. Ocul Immunol Inflamm 2023.

See these in context on the Lactobacillus Acidophilus monograph →

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

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