Some medicines developed for conditions other than bacterial infections can inhibit bacteria in laboratory experiments, and studying how they do so may reveal new antimicrobial targets. But the evidence does not show that these drugs treat infections in people. It also raises a research question: adaptation to some non-antibiotics may overlap with resistance to conventional antibiotics.
What counts as a non-antibiotic with antibacterial activity?
Here, “non-antibiotic” means a drug not ordinarily prescribed to treat bacterial infections. The term describes its usual medical purpose; it does not mean the drug cannot affect bacteria. Conversely, inhibiting bacterial growth in a laboratory does not make a medicine a safe or effective antibiotic for patients.
As an Amazon Associate I earn from qualifying purchases.
What did the 2024 Science study find?
Mariana Noto Guillen, Carmen Li, Brittany Rosener, and Amir Mitchell screened 1,280 drugs against laboratory Escherichia coli in defined growth medium. At 10 μM, 176 non-antibiotics and 142 antibiotics met the initial growth-inhibition cutoff. In follow-up experiments with four replicates, 104 non-antibiotics showed significant growth inhibition. These are results from a laboratory screening system, not a clinical trial. Read the study in Science.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
Many drugs had different genetic interaction profiles
The team then examined 186 drugs using 6,709 barcoded knockout strains, representing 3,500 non-essential E. coli genes, and measured more than two million gene–drug interactions. Most non-antibiotics did not group with established antibiotic classes based on their genetic interaction profiles. About half formed separate modules among themselves, which the authors say may point to shared, underused bacterial targets. This suggests avenues for target discovery; it does not establish that the drugs themselves are suitable treatments.
#1 Best Overall
- NON-DROWSY/IMMUNE SYSTEM SUPPORT*: An herbal combination formulated for the support of a healthy immune system*
- WITH GARLIC EXTRACT, ELDERBERRY, OLIVE LEAF EXTRACT, AND OREGANO OIL: This botanical formula has garlic extract, which has been used for centuries to promote overall wellness.* We've also included elderberry, olive leaf extract, and oregano oil to complete this comprehensive formula*
- CLASSIFICATIONS/CERTIFICATIONS: Kosher Contains Gelatin, Halal
- GMP Quality Assured: A-rated, third-party certification means that every aspect of the NOW manufacturing process has been examined. Our in-house laboratories are ISO/IEC accredited for laboratory testing including for stability, potency and product formulation.
- Founded in 1968 by Elwood Richard, NOW is one of the largest independent, family- and employee-owned manufacturers of natural products
Transport and efflux affected both groups
Disabling at least one transport system increased bacterial sensitivity to 93% of the antibiotics and 82% of the non-antibiotics in the genetic analysis. Transport and efflux systems can therefore shape susceptibility to both groups, even when their primary toxic effects differ. The authors summarize the finding this way: “Non-antibiotics and antibiotics use divergent toxicity mechanisms in bacteria yet are both impacted by shared efflux systems.”
Could non-antibiotics contribute to antibiotic resistance?
The study evolved E. coli under exposure to three non-antibiotics: streptozotocin, triclabendazole, and sertraline. The adapted bacteria provide laboratory evidence that responses to a non-antibiotic can coincide with changes relevant to antibiotic susceptibility.
Rank #2
- Enhances Your Natural Defenses - Formulated with echinacea extract, turmeric curcumin, astragalus root, our natural immune booster & wellness vitamins are developed to strengthen your immune system minus the harmful side effects.
- Combats Seasonal Sniffles - These immune system booster adult vitamins fend off diseases before they set in. They effectively keep the common cold, flu, sore throat, coughing & sneezing, runny nose, & stomach flu at bay.
- Maintains Good Blood Pressure Levels - Our immune system vitamins are a natural source of garlic extract & burdock root. Together, these components help maintain healthy blood pressure levels & improve overall blood circulation.
- Number of items: 1
Sertraline-adapted bacteria showed cross-resistance
Sertraline-adapted strains carried mutations in regulators associated with efflux pumps and showed broad cross-resistance across the antibiotic panel tested. This is a result in experimentally adapted bacteria; it does not establish that people taking sertraline develop antibiotic-resistant infections.
Recommended Free Tools
Triclabendazole pointed to a different target
Triclabendazole-adapted strains had mutations in infB, the gene encoding translation initiation factor IF2. Follow-up assays indicated that triclabendazole and two related drugs bind IF2. The finding identifies a possible bacterial target and a laboratory adaptation pathway, not a measured risk in treated people.
Rank #3
- Advanced Oregano Supplement & Garlic Supplements for Women and Men - Our product takes oil of oregano powder and garlic pills and combines them with Olive Leaf Extract, Black Seeds, and Elderberry Supplements and the results are amazing. Normal Garlic Capsules are found as garlic extract softgels or garlic oil supplement. However, Clean Nutra has officially created an even more potent all in one immune support and digestive supplement.
- The Ultimate Olive Leaf Extract Capsules & Oregano Oil Powder You've Been Looking For - Clean Nutra HerbaPlex provides 4 full-dose products in one immune support complex containing a full Zinc Supplement, Vitamin D3 5000 IU, Black Seed Oil Capsules Powder Extract, and Sambucus Elderberry in a convenient 2 capsule dosage. Finally, a Garlic Supplement, Black Seed Powder, and Olive Extract Leaf have been packed into one simple solution.
- Introducing the Oregano Oil Capsules HerbaPlex All In One Supplement - In addition to immune support for women and men and zinc gluconate, our formula contains Vitamin D 5000 IU, Garlic Pills Odorless, Olive Leaves, Oregano Oil Capsules Powder Extract, and Black Seed Oil Pills equivalents. This is a powerful alternative to Black Seed Oil Gummies, Oregano Oil Drops, Oil Of Oregano Capsules, Black Seed Oil Organic Cold Pressed, and Oil Of Oregano Drops.
- A Powerful Oregano Herbal Complex Supplement - HerbaPlex is overflowing with potent zinc gluconate capsules and more such as Vitamin D3, Olive Leaf and Oregano. Clear out the countless zink tablets, oregano oil, olive leaf capsules, oil of oregano liquid, black seed oil liquid in your cabinet and consider just one inclusive supplement from Clean Nutraceuticals.
- Vetted and Trusted Ingredients - We pride ourselves in offering a quality supplement that combines the benefits of zinc pills, oil oregano, odorless garlic and more. Our formulas are proudly made in a registered and certified facility. Many products offer only a few ingredients like oregano oil organic, oregano oil capsules organic, organic black seed oil and aceite de oregano. However, this all-in-one contains much more.
The authors used a well-characterized laboratory E. coli strain as a high-throughput platform and call for further study in human microbiome isolates and in people receiving these medicines. Whether the observed adaptation occurs in treated individuals, and how clinically important it might be, remains unresolved.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What do drug-combination experiments add?
A separate 2023 Nature Microbiology study tested non-antibiotic medicines alongside antibiotics against Staphylococcus aureus. Across 52 non-antibiotics, it reported 140 synergistic interactions and 105 antagonistic interactions, mainly involving antibiotics. The results show that a non-antibiotic can enhance or weaken an antibiotic’s effect under particular experimental conditions; they do not establish a general rule for drug combinations. Read the combination study in Nature Microbiology.
Rank #4
- Immune Support Formula: Made with Vitamin C and Zinc, two key nutrients commonly used to help support normal immune system function
- Herbal Wellness Blend: Formulated with Andrographis, Echinacea, Garlic Extract, Bee Propolis, and other ingredients to support overall wellness
- Antioxidant Support: Includes Vitamin C, Bee Propolis, and Echinacea to help support antioxidant wellness and the body's natural defenses
- Easy-to-Digest Capsules: Plant-based dietary supplement capsules designed for convenient daily use as part of your immune support routine
- Traditional Herbal Blend: Ampitrexyl Plus includes Andrographis, an herb traditionally used in Chinese and Ayurvedic wellness practices
One combination, ibuprofen plus gentamicin, was validated against a resistant MRSA clinical isolate in vitro and in a Galleria mellonella infection model. This is preclinical evidence: a result in a dish or an insect model is not an established human treatment. The S. aureus combination experiments and the E. coli screening and evolution experiments also involve different organisms and methods, so their findings should not be treated as directly interchangeable.
Quick wins for a faster PC:
Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →What the evidence does—and does not—support
- Supported: In the tested laboratory E. coli system, many non-antibiotics inhibited bacterial growth, and their genetic interaction patterns often differed from established antibiotic classes.
- Supported: Transport systems affected sensitivity to both antibiotics and non-antibiotics, and some laboratory-evolved responses to non-antibiotics coincided with antibiotic cross-resistance.
- Supported: In tested S. aureus combinations, non-antibiotics could interact with antibiotics in either a synergistic or antagonistic way.
- Not established: That these medicines can safely or effectively treat bacterial infections in people, that the experimental combinations benefit patients, or that taking the drugs causes a population-level increase in antibiotic resistance.
The results make non-antibiotics useful subjects for studying bacterial targets, transport, and resistance pathways. They do not justify using these medicines to treat an infection or combining them with antibiotics outside medical care.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
