C. difficile Infection

Almost any antibiotic can allow C. difficile to take hold, though some carry more risk than others. The bacterium forms hardy spores that survive on surfaces for a long time and spread via contaminated hands, toilets, equipment and bed rails. Other risk factors include age over 65, a recent hospital stay, bowel diseases such as inflammatory bowel disease, kidney disease, and possibly long-term acid-reducing medicines (proton pump inhibitors). Some people carry the bacterium without any symptoms.

It is one of the most common healthcare-associated infections in the world, mostly in hospitals and care homes, but it can also occur in people living at home. It is more frequent in older adults, in people who took antibiotics recently, and in those with weakened immunity or long hospital stays. Infection can come back in a substantial minority of patients after treatment.

Antibiotics are sometimes taken without a prescription or without a clear need; this raises the risk of C. difficile as well as antibiotic resistance, so use antibiotics only when your doctor prescribes them. For people fasting in Ramadan, diarrhea with dehydration should lead to breaking the fast and seeking medical advice. For travel for Umrah or Hajj, good hand washing with soap and water and drinking safe water help to reduce infections.

Testing is done on a stool sample, and only when a person has diarrhea (usually three or more loose stools in 24 hours) and risk factors. Labs look for the bacterium and its toxin, often using more than one test. Do not test formed stool, and do not repeat testing to check for cure, because tests can stay positive for weeks after you recover. Blood tests check for dehydration and signs of severe illness, and a scan or colonoscopy is used only in severe or unclear cases.

Hygiene is essential because the spores spread easily to other people.

• Wash hands with soap and water after the toilet and before eating. Alcohol hand gel does not reliably kill C. difficile spores.

• Clean the toilet and bathroom surfaces with a bleach-based household cleaner as advised; use a separate toilet if possible.

• Wash soiled clothes and bedding on a hot cycle.

• Stay home from work, school or nursery until diarrhea has settled, as your doctor advises.

• Tell any doctor or dentist you have had C. difficile before they prescribe antibiotics.

Diet does not cure the infection, but fluids are very important.

• Drink plenty of fluids; oral rehydration solutions help if you are losing a lot of fluid.

• Eat small, simple meals as you can tolerate them.

• Avoid alcohol and very fatty or sugary foods while you have diarrhea.

• Probiotics have not been proven to treat the infection; ask your doctor before using any.

C. difficile is treated with specific antibiotics taken by mouth. Your doctor chooses the medicine and the length of treatment, and you should finish the course.

• Fidaxomicin or oral vancomycin are the usual first choices; metronidazole is now used less often.

• Stop the antibiotic that triggered the infection if your doctor confirms that this is safe.

• Do not take anti-diarrhea medicines such as loperamide unless your doctor approves; they can trap toxins in the bowel.

• Your doctor may review whether you still need acid-reducing medicines.

• For repeated infections, special options such as extended antibiotic schedules or microbiome-based treatments may be considered by a specialist.

Procedures are not needed for most patients but are important for repeated or severe infections.

• Fecal microbiota transplantation (FMT): healthy donor gut bacteria are given by colonoscopy, enema or capsules to restore the gut balance in repeated infections.

• Hospital care with intravenous fluids and close monitoring for severe infection.

• Surgery to remove the diseased colon is rarely needed and is reserved for life-threatening disease.

Newer guidelines favour specific antibiotics taken by mouth such as fidaxomicin or vancomycin over older options. For repeated infections, treatments that restore healthy gut bacteria, including fecal microbiota transplantation and approved microbiome-based products where available, have shown strong results. Their availability differs between countries, so ask your specialist.

Most people improve within days of the right treatment, although diarrhea can take a week or two to settle. Some people have a recurrence, usually within weeks, and this can be treated again with a different plan. Severe cases are uncommon but can be life-threatening, especially in frail older adults.

• Which antibiotic should I take, and for how long?

• Do I need to stop the antibiotic I was already taking?

• How can I protect my family and when can I return to work?

• What is my chance of recurrence, and what are the options if it returns?

• Should I continue my acid-reducing medicine?

This guide comes from the Saudi Gastroenterology Association (SGA) patient library, prepared by the Approved for publication by SGA; individual clinician review is ongoing. Last reviewed: 2026-04-24. It is for education and does not replace your doctor's advice.