Antimicrobial agents include a variety of plant and herbal extracts that can knock out bad bacteria and other infectious microbes.
They can help with stubborn cases of SIBO, dysbiosis and fungal or parasitic infections, and the effects of these, such as fatigue, inflammation and brain fog.
Antimicrobials are a useful extra to nudge to balance gut health , but diet and probiotics should be the first lines of defense.
Dealing with crippling fatigue, brain fog, and inflammatory or autoimmune issues can be debilitating.
These issues often originate in the gut and may occur due to imbalances in good and bad gut bacteria (dysbiosis), small intestinal bacterial overgrowth (SIBO), or increased permeability of the intestinal lining (“leaky gut”).
Some people can normalize gut microbial balance and restore resilience and integrity to their intestinal lining without the extra assistance of antimicrobial agents — in these people, diet, lifestyle and probiotics can be sufficient to restore balance and resolve symptoms.
But for others, antimicrobials can be a game changer. In this article, we’ll explore when and how to consider antimicrobial agents, what they do, and which ones have been shown to be the most effective.
What Are Antimicrobial Agents?
Antimicrobials are substances that kill or prevent the growth of microbes. They include :
Antibiotics (antibacterial agents)
Antibiotics vs. Antimicrobials
While all antibiotics are antimicrobials, not all antimicrobials are antibiotics .
Antibiotics are exclusively antibacterial. For example, most of us have either heard of or been prescribed antibiotics such as chloramphenicol, penicillin/cephalosporins, streptomycin, or tetracycline. You might also know of some common bacterial growths that antibiotics help eliminate — such as Escherichia coli (E. coli) and staphylococcus aureus.
However, antimicrobials combat a wider variety of microbes (microorganisms). Antimicrobial agents include not just bactericidal and bacteriostatic compounds that kill or inhibit bacteria but also those that have toxicity or inhibition against viruses and fungi, or which are antiparasitic.
When to Introduce Antimicrobials
Most of my patients who have issues such as brain fog, poor mood, autoimmune and inflammatory conditions are also dealing with imbalances within their gut microbiology. Such imbalances can include SIBO, fungal overgrowth (yeast or candida), H. pylori, and parasitic worms [3 Trusted SourcePubMedGo to source, 4 Trusted SourcePubMedGo to source, 5].
With this being the case, you may wonder why I don’t recommend antimicrobial agents as a first step for chronic symptoms related to poor gut health.
The reason is that in a science-based approach, diet and probiotics should always be the first foundation to tackling gut health issues, with antimicrobials a third line option.
This order doesn’t just from my own experience with patients, but from research evidence and good practice guidelines around the world. For example, the 2021 IBS treatment guidelines from the British Society of Gastroenterology and Romanian Society of Neurogastroenterology reflect this treatment order [6 Trusted SourcePubMedGo to source, 7 Trusted SourcePubMedGo to source]. So to, recap, antimicrobial agents feature as the third step in the following treatment pathway:
Reset: Make dietary changes that will help reset your gut health and serve as the foundation to your future health.
Support: Add effective probiotics that will support your gut health with helpful bacteria.
Remove: If symptoms persist, antimicrobials can remove remaining pathogens that could be continuing to harm your health.
Let’s look at these in turn:
Reset Your Gut Through Diet
A diet that eliminates potentially inflammatory foods and foods that could stimulate an immune reaction can be hugely beneficial to your overall health and is always the first place to start.
I recommend beginning with a Paleo-style diet, which is low in potentially inflammatory foods including dairy and gluten, but rich in plenty of nutrient-rich fruit and vegetables.
For many people, this will be enough to allow the gut to start to reset and heal.
More recently, many of my patients have found an elemental formula hugely effective either alone or in association with a Paleo or FODMAP diet. You don’t have to replace every meal if you don’t want to, and just replacing breakfast and/or lunch is enough to help the gut rest and repair for some people.
What’s more, research has shown that elemental diets can significantly improve symptoms for those with IBD, IBS, SIBO, and other digestive disorders [12, 13, 14, 15, 16, 17, 18 Trusted SourcePubMedGo to source].
Probiotics are the next step after diet and can create powerful improvements in your gut and microbiota health.
For example, a meta-analysis of 18 studies found that probiotics significantly improved bacterial overgrowth and helped reduce abdominal pain for SIBO patients [19 Trusted SourcePubMedGo to source].
One SIBO-probiotics study found probiotics to be more effective than Metronidazole, an antibiotic treatment for SIBO [20 Trusted SourcePubMedGo to source].
Multi-strain probiotics also help improve abdominal pain and discomfort for those with IBS .
S. boulardii (a healthy fungus) has been shown effective in treating digestive tract parasites such as amoebas, giardia, and Blastocystis hominis [22 Trusted SourcePubMedGo to source].
In general, probiotics help to reduce inflammation, fight intestinal pathogens and toxins, and improve the bacterial composition of the gut, which can help to generally support digestive function and overall human health [19 Trusted SourcePubMedGo to source, 23 Trusted SourcePubMedGo to source, 24].
Research suggests the best results can be obtained by including a diversity of high-quality probiotics. For example, two systematic reviews and meta-analyses indicated that multi-strain probiotics were more effective than single-strain probiotics for treating IBS [25 Trusted SourcePubMedGo to source].
Most probiotics fall into one of these three categories. For best results, I suggest you take one probiotic from each category:
The time to introduce antimicrobial agents is if some stubborn symptoms remain after you’ve reset your diet and supported your system with probiotics for a couple of weeks. This whole process may take anywhere from a few weeks to a few months depending on how much experimentation is needed to identify your ideal diet.
As I write in Healthy Gut, Healthy You, rather than trying to pinpoint exactly what “bad” microbe might be causing you problems, a holistic approach with medicinal plants that have broad spectrum antimicrobial approaches is often most helpful.
Some medicinal plants and herbs have demonstrated antibacterial, antifungal, antiviral, and antiparasitic capabilities and are valuable for controlling infectious microbes .
Antibacterials can be “cidal” (as in bacteriocidal, meaning they actually kill bacteria) or “static” (as in bacteriostatic, meaning they stunt or have a regulatory effect on bacteria growth).
The way antibacterials target harmful bacteria is three-fold :
They can break down the bacterial cell wall
They can target bacterial ribosomes (part of the genetic material inside bacteria)
They can destroy bacterial enzymes involved in bacterial reproduction
Benefits of Antimicrobials
The benefits of antimicrobials are broader than just killing harmful microorganisms. Other beneficial effects extend to mental health and general well being.
Here are some examples of antimicrobial agent benefits supported by research:
Improved cognitive function: A recent systematic review found that berberine may inhibit the development of dementia by preventing brain damage and enhancing cognition [27 Trusted SourcePubMedGo to source].
SIBO treatment: In one study, a mixture of herbal antimicrobial agents that included berberine and oregano oil was as effective at taming small intestinal bacterial overgrowth as the antibiotic Rifaximin .
Reduced mental fatigue: Taking peppermint oil capsules improved performance and reduced fatigue in people given a cognitively demanding task [29 Trusted SourcePubMedGo to source].
Inflammation relief: A high-quality 2019 review found that berberine appears to decrease serum C-reactive protein levels in the blood — indicating a reduction in chronic inflammation [30 Trusted SourcePubMedGo to source].
Some Effective Antimicrobial Agents
Most herbal anti-bacterial, antiviral and antifungal agents have been studied in laboratory and animal studies but not yet in human clinical trials.
We do, however, have excellent evidence that conventional pharmaceutical antibiotics can offer benefits for conditions such as SIBO. We can infer from these studies that natural, plant-based equivalents could also curb harmful bacteria overgrowths (and may be kinder on the system).
Here are some interesting antimicrobials and the research behind them:
Berberine, which naturally occurs in various plants, including Oregon grape and goldenseal
Effective antimicrobial agent and anti -inflammatory
May inhibit dementia by preventing brain damage. Beneficial effect on high blood cholesterol and triglycerides. Improved diarrhea symptoms in IBS; may also help H. pylori eradication and reduce colorectal adenoma recurrence.
While these pharmaceuticals can be very helpful in certain cases, they don’t tend to have the broad spectrum disinfectant action plant versions do — just one herb can kill bacteria, fungi, and protozoa) .
Nevertheless, they do have their place. Discuss the pros and cons of conventional versus more natural options with your doctor.
Potential Antimicrobial Side Effects
As antimicrobial agents can be powerful, they need to be treated with respect. You should be aware that they can come with potential side effects.
One of these potential side effects occurs when bad bacteria die inside your body, causing what’s known as a die-off reaction. It may lead to:
Fortunately, a die-off reaction should last no more than a few days to a week. It’s also a good sign that your antimicrobial regimen is working.
If, however, your reaction doesn’t go away after a week, you may be allergic to something in the antimicrobial formula you are taking. In this case, my advice would be to stop taking all antimicrobials for a few days and see how you feel.
You could then introduce individual antimicrobials one at a time to isolate what you had a problem with. Or, the antimicrobial may be effective, but you may need a lower dose. Consult with your doctor about why your reaction symptoms aren’t going away.
Antimicrobial resistance is the process of bacteria, viruses, fungi, or parasites changing over time so their susceptibility to antimicrobials decreases. This is a threat to public health, as it increases the difficulty of treating infections and raises the risk of disease spread and serious illness .
Intrinsic antibiotic resistance is when a microorganism has a natural feature protecting it from being destroyed by an antimicrobial agent. An example of intrinsic resistance can be found in “gram-negative bacteria” — resistant strains that have developed an outer membrane around their thin bacterial cell wall, protecting them from some types of antibiotics.
Acquired resistance is more serious. It occurs when a bacterium (gram-positive type in this case) that was once susceptible to antimicrobials develops resistance over time. An example is in methicillin-resistant Staphylococcus aureus, or MRSA.
The worst case scenario is when there are no new drugs left to treat disease-causing bacteria. For example, vancomycin is the antibiotic of last resort in Western medicine, yet a few bacteria have already started to become resistant to it .
The bad news: Resistance to antimicrobials is almost inevitable because of the prevalence and huge diversity of microorganisms.
The good news: Functional and herbal medicine can help, as herbal compounds have a broad-acting pharmacology, enabling control of pharmaceutical-resistant organisms [53 Trusted SourcePubMedGo to source].
The Bottom Line
Antimicrobial agents help people to resolve stubborn health problems that originate from microbial imbalances in the gut. They should generally come into play only after you have first changed your diet and taken a course of multi-strain probiotics.
Choosing the right antimicrobial and navigating your way through potential side effects isn’t always easy on your own. Consider scheduling a virtual or in-person consultation at our functional medicine center, or check out my book, Healthy Gut, Healthy You, for more guidance.
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