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Dietary supplement

Fast Melt Immune Probiotic 3 Billion With Bifodan Ingredients & Drug Interactions

by Doctor's Best

Fast Melt Immune Probiotic 3 Billion With Bifodan label
See full label image
Other (e.g. Tea Bag) Category: Non-nutrient/non-botanical
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 30, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Fast Melt Immune Probiotic 3 Billion With Bifodan 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

Fast Melt Immune Probiotic 3 Billion With Bifodan is a dietary supplement by Doctor's Best with 1 active ingredient. 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 Probiotic Bacterial Strains. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against Fast Melt Immune Probiotic 3 Billion With Bifodan by Doctor's Best

Ask about any prescription or over-the-counter medication and we check it for interactions with Fast Melt Immune Probiotic 3 Billion With Bifodan by Doctor's Best — and tell you which ingredient is responsible.

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Computed from our clinical databases

HelloPharmacist Scorecard of Fast Melt Immune Probiotic 3 Billion With Bifodan by Doctor's Best

Four independent checks of what is known — a summary of the available information, not a grade of the product itself.

Evidence for Intended Use
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
Not assessable

None of the active ingredients could be matched to our evidence database, so intended use can't be graded.

Why this rating?
  • None of the active ingredients could be matched to a HelloPharmacist monograph, so intended use can't be graded against our evidence data.
Ingredient Transparency
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.
  • “Probiotic Bacterial Strains” is listed as a grouped ingredient — the label doesn't break down how much of each component you get.
Known Interaction Concern
Not assessable

None of the active ingredients could be matched to our interaction database.

Why this rating?
  • We couldn't match any ingredient to a HelloPharmacist monograph, so there was nothing to check interactions against.
Safety Information
Unable to assess

None of the active ingredients could be matched to our safety data.

Why this rating?
  • We couldn't match any ingredient to a HelloPharmacist monograph, so there was no safety data to measure.

HelloPharmacist summaryFormula with limited ingredient disclosure with no assessable stated purpose. Medication interactions could not be assessed, and safety information could not be assessed.

Assessment coverage: 0 of 2 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Aug 24, 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 Fast Melt Immune Probiotic 3 Billion With Bifodan, straight from the product label.

Brand Doctor's Best
Barcode (UPC) 753950004368
Net contents 30 Stick Pack(s)
Market status On market
Date entered into DSLD Aug 24, 2016
DSLD ID 63960
Product type Non-nutrient/non-botanical
Supplement form Other (e.g. Tea Bag)
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Vegan, Vegetarian, Adult (18 - 50 Years), Gluten 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 Fast Melt Immune Probiotic 3 Billion With Bifodan by Doctor's Best, 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 Gram(s)
Maximum serving Sizes:
1 Gram(s)
Servings per container
30
UPC/BARCODE
753950004368
IngredientAmount% DV
Probiotic Bacterial Strains0 NP--
Lactobacillus rhamnosus GG:0 NP--
Bifidobacterium lactis BL-04:0 NP--

Other ingredients: Erythritol, Xylitol, natural Blueberry flavor, Mono- and Diglycerides of Fatty Acids, Magnesium Oxide, Citric Acid, Sodium Carboxymethylcellulose, Silicon Dioxide, Other Ingredients, Redberry:

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.
Formula

Contains clinically documented strains – Lactobacillus rhamnosus GG and Bifidobacterium lactis BL-04 BL-04

Doctor’s Best Fast Melt Immune Probiotic contains 2 strains of beneficial bacteria from Bifodan that can help reduce the number and duration of upper respiratory tract and gastrointestinal incidents.

Formulation

~ Non-GMO and Vegan

~ Non-GMO and Vegan

Non-GMO / Gluten Free / Soy Free

Vegan

Contains No genetically modified ingredients, No wheat, No gluten, No sugar, No dairy, No nuts, No Soy, No shellfish, No yeast, No artificial colors, and No artificial flavors.

General

YDRB436

General Statements

HELPS REDUCE UPPER RESPIRATORY AND GI INCIDENTS*

Probiotic Powder 30 Stick Packs

Clinical studies show that these probiotic strains, Lactobacillus rhamnosus GG and Bifidobacterium lactis Bl-04, help promote a healthy immune system. Approxiamtely 70% of the immune system resides in the intestinal tract. Fast Melt Immune Probiotic dissolves rapidly and helps restore the natural balance of good bacteria in the digestive tract.

Helps restore healthy gut bacteria* Helps promote a healthy immune system* Rapid dissolution and quick absorption

Contains: 15 Blueberry stick packs 15 Redberry stick packs

Fast Melt Immune Probiotic: ~ Dissolves instantly on the tongue – requires no water ~ Has a fast melting / cooling effect

FDA Statement of Identity

Dietary Supplement

Seals/Symbols

Vegan

Suggested/Recommended/Usage/Directions

Suggested Adult Use: Pour contents of 1 stick pack directly into your mouth daily, or as recommended by a nutritionally-informed physician.

For easy on-the-go use Doctor’s Best Fast Melt Immune Probiotic dissolves rapidly on the tongue without water. Just one great-tasting stick pack provides the daily dosage.

Storage

Store in a cool dry place.

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.

Brand IP Statement(s)

Science-Based Nutrition

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

See for yourself

Fast Melt Immune Probiotic 3 Billion With Bifodan by Doctor's Best label

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

Fast Melt Immune Probiotic 3 Billion With Bifodan 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 Fast Melt Immune Probiotic 3 Billion With Bifodan by Doctor's Best

This is the 1 active ingredient this product is made of. Select it to open its full monograph.

Serving size1 Gram(s) Dosage formOther (e.g. Tea Bag) Servings per container30 Amounts shown are per serving.

Probiotic Bacterial Strains

Interacts with
182 drugs
0 NP per serving

Lactobacillus acidophilus is a 'friendly' bacterium used as a probiotic to support gut and vaginal health. It is generally well tolerated in healthy p...

Probiotic Bacterial Strains monograph & interactions
  • › Lactobacillus rhamnosus GG:
  • › Bifidobacterium lactis BL-04:

Other (inactive) ingredients: Erythritol, Xylitol, Natural Blueberry flavor, Mono- and Diglycerides of Fatty Acids, Magnesium Oxide, Citric Acid, Sodium Carboxymethylcellulose, Silicon Dioxide, Other Ingredients, Redberry:. These complete the product’s ingredient list but are not active constituents.

Interaction report

Fast Melt Immune Probiotic 3 Billion With Bifodan by Doctor's Best Drug Interactions

Fast Melt Immune Probiotic 3 Billion With Bifodan contains a single active ingredient, and it has known interactions with 182 medications. Here’s the picture, then you can look up your own drug.

Want to check YOUR meds against Fast Melt Immune Probiotic 3 Billion With Bifodan?

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

Probiotic Bacterial Strains 182

Individual Drug Interactions

The ingredients in Fast Melt Immune Probiotic 3 Billion With Bifodan interact with 182 drugs. Click any drug to see the details.

1 of the 1 ingredient in Fast Melt Immune Probiotic 3 Billion With Bifodan interact with drugs. Each result below shows which ingredient is responsible. Probiotic Bacterial Strains

Each ingredient & the kinds of drugs it affects

For each ingredient in Fast Melt Immune Probiotic 3 Billion With Bifodan 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.

Probiotic Bacterial Strains1 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
Probiotic Bacterial Strains full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Fast Melt Immune Probiotic 3 Billion With Bifodan, from the product label.

Doctor's Best

See all Doctor's Best products
Name
Doctor's Best, Inc.
State
California
Phone Number
(800) 777-2474
Web Address
www.drbvitamins.com
Pharmacist Counseling Corner

Fast Melt Immune Probiotic 3 Billion With Bifodan by Doctor's Best: Common Questions

Does Fast Melt Immune Probiotic 3 Billion With Bifodan by Doctor's Best interact with any medications?
Yes. Based on its ingredients, Fast Melt Immune Probiotic 3 Billion With Bifodan 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?
Fast Melt Immune Probiotic 3 Billion With Bifodan contains a single active ingredient, and that one ingredient can interact with many different medications on its own. We check it against each medication and show the mechanism 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.

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

Not sure if Fast Melt Immune Probiotic 3 Billion With Bifodan is safe with your meds?

Our pharmacists answer your medication & supplement questions — free.

Ask a pharmacist

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.

Fast Melt Immune Probiotic 3 Billion With Bifodan label
Go deeper

The Full Monographs Behind Fast Melt Immune Probiotic 3 Billion With Bifodan’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

Fast Melt Immune Probiotic 3 Billion With Bifodan'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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