Scientists in the UK are exploring an unconventional but compelling method to fight drug-resistant infections — “poo pills.”
These tiny capsules, filled with freeze-dried stool from healthy donors, are showing remarkable potential in flushing harmful superbugs from the gut and replacing them with beneficial bacteria.
The human intestine is a major reservoir for antibiotic-resistant bacteria. When these superbugs escape the gut, they can cause serious infections in the urinary tract, bloodstream, or other parts of the body.
Currently, antibiotic resistance kills around a million people per year worldwide, prompting researchers to look for alternatives to conventional treatment.
The Rise of Stool-Based Therapies
Transplants of healthy stool — previously done via colonoscopy, enema, or nasogastric tube — are already approved in many countries to treat severe Clostridium difficile infections.
Observations from these treatments noted that superbugs in treated patients often disappeared. This sparked interest in whether similar approaches could tackle resistant infections.
In London, doctors have begun piloting stool-based capsules in 41 patients who suffered from drug-resistant infections in the past six months.
Healthy-donor stool is rigorously screened to ensure safety, processed to remove solids, freeze-dried, and placed into easy-to-swallow capsules designed to dissolve in the intestines.
Initial Results and Gut Health
Early results show encouraging trends. Participants tolerated the pills well, and the donor bacteria remained detectable in their gut for at least a month afterward.
The pill treatment appears to reshape the microbial community in the intestines—boosting diversity and pushing out superbugs through competition for food and space .
Related trials are expanding this research. For example, the PROMISE trial in patients with liver disease is testing similar capsules to reduce superbug infections in cirrhosis patients using periodic oral doses.
Studies in North America are even investigating the effect of stool capsules on cancer patients’ responses to chemotherapy.
Microbiome Medicine on the Rise
Regulators like the UK’s Medicines and Healthcare products Regulatory Agency (MHRA) report over 450 microbiome-based therapies are currently in development.
Experts say we may soon see a shift toward using these therapies instead of traditional antibiotics .
The gut microbiome—our internal ecosystem of bacteria, fungi, and viruses—plays a crucial role in digestion, immunity, and even brain health.
Restoring balance through microbiome therapies may not only defeat resistant infections but also support better overall well-being .
If ongoing trials uphold these early results, “poo pills” could become mainstream for both treating and preventing superbug infections.
They may prove especially valuable in vulnerable patients—those undergoing chemotherapy or organ transplants—who face heightened risk from antibiotic-resistant bacteria.
