Herb & supplement monograph

Streptococcus Thermophilus Drug Interactions, Uses, Effectiveness, Safety & More

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS ·Updated July 2026

What is this page for?

First and foremost: how Streptococcus Thermophilus interacts with medications. The heart of this page is the interaction list — every drug Streptococcus Thermophilus is known to interact with, and how serious each one is.

But these pages have grown well beyond that into a full monograph — what Streptococcus Thermophilus is, what people use it for and how strong the evidence is, its safety and side effects, and answers to the questions we’re asked most — written and reviewed by the clinical staff at HelloPharmacist. It’s educational information from our licensed clinical databases, not medical advice, and we don’t sell or endorse products. Our editorial policy

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Interaction report

Drugs that interact with Streptococcus Thermophilus

0 medications have a known interaction with Streptococcus Thermophilus, graded by severity. Select any drug for the full evidence-based detail.

We don’t currently list any known drug interactions for Streptococcus Thermophilus. This doesn’t guarantee none exist — always confirm with your pharmacist before combining supplements with your medications.

Read The List Like a Pharmacist

What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
Probable. 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.
Possible. Interaction 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
Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
Each drug listed above links to the full report for that exact Streptococcus Thermophilus combination — clinical detail, likelihood, evidence level, and citations.
Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

Monograph

Streptococcus Thermophilus: Uses, Safety & Side Effects

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS · Reviewed July 2026 ·

The bottom line

Streptococcus thermophilus is a friendly bacterium used as a probiotic, often combined with other strains in yogurt and supplements. It is generally well tolerated in healthy people and may help with digestion and lactose breakdown, but solid evidence for most specific health claims is still limited. Talk with your pharmacist or doctor before starting it, especially if your immune system is weak.

Scientific name: Streptococcus thermophilus
Family: Streptococcaceae
Part used: Live bacterial cells (probiotic culture)
Common forms: Capsules, powders, probiotic blends, yogurt, fermented dairy products

People commonly use it for

Digestive health
Lactose intolerance
Diarrhea prevention and support
Gut microbiome balance
Immune support

Popular and traditional uses — not proof it works. See “Uses & effectiveness” below for the evidence.

Safety at a glance

OverallUse caution

Generally well tolerated in healthy people, but people with weakened immune systems should be careful.

PregnancyPossibly Safe

When used orally and appropriately, short-term. A combination of Streptococcus thermophilus, Lactobacillus acidophilus, Bifidobacterium animalis, and...

Read the full pregnancy detail

BreastfeedingInsufficient reliable information

Insufficient reliable information available; avoid using.

Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center). Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

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Overview

Streptococcus thermophilus is a type of beneficial ("friendly") bacteria used as a probiotic. Despite having "Streptococcus" in its name, it is not related to the bacteria that cause strep throat or other infections. It is considered safe for use in food and is widely used to make yogurt, cheese, and other fermented dairy products.

This bacterium gets its name because it grows well at warm temperatures, which makes it useful in food production. In supplements, it is often combined with other probiotic strains, such as Lactobacillus and Bifidobacterium species.

People take Streptococcus thermophilus hoping to support digestion, help balance the bacteria in the gut, and improve overall gut health.

How it works

Streptococcus thermophilus is thought to work by adding to the population of helpful bacteria in the digestive tract. A balanced gut microbiome may support digestion and help limit the growth of harmful bacteria.

This bacterium produces an enzyme called lactase (beta-galactosidase), which breaks down lactose, the sugar in milk. This may explain why fermented dairy products like yogurt are often easier to tolerate for people who are sensitive to lactose.

Probiotics may also produce substances that lower the pH in the gut and help the gut lining stay healthy. Many of these proposed mechanisms come from laboratory or animal studies, so how strongly they apply to people is not fully proven.

Effectiveness

Does Streptococcus Thermophilus work?

Here’s what the research actually shows for each use — graded by Natural Medicines and reviewed by Dr. Brian Staiger, PharmD.

Evidence overview · 33 uses evaluated

33 Insufficient evidence

How to read these evidence grades

Natural Medicines’ 7-point scale. We show each rating’s label word-for-word.

1EffectiveStrong, consistent evidence it works.

2Likely EffectiveGood evidence, though not yet conclusive.

3Possibly EffectiveSome evidence suggests a benefit.

4Possibly IneffectiveSome evidence it may not help.

5Likely IneffectiveFairly strong evidence it doesn’t help.

6IneffectiveStrong evidence it doesn’t work.

7Insufficient Reliable Evidence to RateToo little research to say either way.

For Streptococcus Thermophilus, current evidence isn’t strong enough to rate any specific use. The conditions it has been studied for are listed below.

Also studied for 33 conditions — evidence insufficient to rate

Insufficient Reliable Evidence To Rate Acute kidney injury (AKI)