New Antibiotic-Specific Probiotics Arrive in Stores
A novel category of probiotic supplements, specifically formulated to be taken alongside antibiotic treatments, has recently appeared on the shelves of supermarkets and pharmacies across the United Kingdom. These products promise to support gut health during a critical period, but they often come with significantly higher price tags compared to standard probiotic options. This raises an important question for consumers: are these specialised supplements truly worth the additional investment the next time you fall ill?
The Gut Disruption Caused by Antibiotics
Antibiotics remain the frontline medical treatment for a wide spectrum of bacterial infections, including pneumonia, whooping cough, and meningitis. In the UK alone, healthcare professionals issue more than 30 million antibiotic prescriptions annually. However, these powerful medications can cause considerable disruption to the digestive system, with approximately one-third of users reporting episodes of diarrhoea as a side effect.
This occurs because antibiotics are broad-spectrum agents, meaning they target a vast array of bacteria simultaneously. While they effectively eliminate the pathogenic bacteria responsible for infections, they also indiscriminately destroy many of the beneficial bacteria residing in the gut. This disruption to the delicate balance of the microbiome can allow harmful bacteria to proliferate, leading not only to diarrhoea but also to stomach cramps and various other gastrointestinal issues.
For individuals on long-term antibiotic regimens, such as those prescribed for severe acne or recurrent urinary tract infections, the disruption to their microbiome can persist for years. Some experts theorise that this prolonged imbalance may contribute to serious health complications extending beyond the gut, including metabolic disorders like type 2 diabetes and inflammatory conditions such as asthma.
The Probiotic Prescription: Mixed Evidence
As scientific understanding of the gut microbiome and its critical role in overall health continues to expand, general practitioners and gut health specialists are increasingly recommending probiotic supplements either during or immediately following a course of antibiotics. These supplements are designed to replenish the population of beneficial organisms in the intestines. Yet, the question remains: is this the most effective strategy for restoring optimal gut health?
A comprehensive review published in the Journal of Clinical Gastroenterology in 2021, which analysed 36 separate studies, found that supplementation with the probiotic strain Lactobacillus rhamnosus—one of the most common bacterial strains found in commercial probiotics—effectively reduced both the incidence and duration of loose stools and bloating associated with antibiotic use.
Conversely, a notable 2018 study featured in the journal Cell presented contradictory findings. This research suggested that taking probiotics after an antibiotic course might actually delay the natural recovery and rebalancing of the gut microbiome. In the study, participants who received a preparation containing 11 widely-used probiotic strains took a full six months for their microbiomes to return to a normal baseline. In stark contrast, the placebo group's microbiome recovered within just three weeks after concluding antibiotic treatment.
The researchers hypothesised that the introduced probiotic bacteria, which were not native to the participants' original microbiomes, may have further crowded out the remaining beneficial bacteria already weakened by antibiotics, thereby slowing the restoration of a healthy gut ecosystem.
Expert Opinions on Timing and Strain Selection
Simon Gaisford, a Professor of Pharmaceutics at University College London, acknowledges the mixed results in clinical studies but cautions against overinterpreting the 2018 Cell study due to its small sample size of only 21 participants. He references his own unpublished laboratory research, which indicated that a specific probiotic formulation led to a faster recovery of the gut microbiome after antibiotic exposure.
"Because taking oral antibiotics is usually quite detrimental to your gut bacteria, I'd still say taking a good probiotic supplement while on a course of antibiotics is sensible," Professor Gaisford advises. He emphasises that timing is crucial; probiotics should be taken between antibiotic doses to prevent the medication from immediately destroying the beneficial bacteria.
Glenn Gibson, a Professor of Food Microbiology at the University of Reading, maintains a longstanding supportive stance on probiotic use with antibiotics. "I'm not convinced by small studies that suggest probiotics may delay the gut microbiome returning to normal," he states. "It's a long-standing observation that probiotics help reset the gut microbiome after antibiotic use. They help the good bacteria thrive and multiply." He recommends opting for products containing well-researched bacterial strains.
Choosing the Right Probiotic
Professor Gaisford highlights that Lactobacillus rhamnosus is particularly notable for its ability to survive stomach acid and adhere to the intestinal lining, making it a prime candidate for post-antibiotic recovery. The evidence is so compelling that the World Gastroenterology Organisation now officially recommends supplementation with this strain during antibiotic treatment.
This strain belongs to the broader category of lactic acid bacteria, which create a more acidic gut environment believed to support beneficial bacteria and inhibit harmful ones. Most probiotics proven effective for antibiotic-related gut health contain bacteria from this group, identifiable by the "Lactobacillus" prefix in their names. Therefore, a product specifically marketed for post-antibiotic use may not be necessary; a general probiotic containing these strains can be equally effective and often more affordable.
For instance, Omni Biotic 10 AAD, a leading post-antibiotic probiotic, costs approximately £43 for a 30-day supply. In comparison, Optibac Every Day, which contains Lactobacillus rhamnosus, is priced around £13.50 for the same duration.
Another beneficial ingredient to consider is Saccharomyces boulardii, a yeast-based probiotic. A 2020 review by the Medical University of Gdansk in Poland concluded that this probiotic helps prevent antibiotic-associated diarrhoea and aids in restoring a healthy gut microbiome.
