When diarrhoea strikes, knowing how to manage it properly can make all the difference in how quickly you recover and prevent complications. Treatment approaches range from simple home care measures to prescription medications, depending on the severity and cause of your symptoms.

Managing Symptoms and Supporting Recovery

The main goal when treating diarrhoea is to prevent dehydration, which occurs when your body loses more fluid than it takes in. This is especially important because diarrhoea causes rapid loss of water and essential minerals called electrolytes, which your body needs to function properly. While most cases of diarrhoea resolve on their own within a few days, taking appropriate steps can help you feel better faster and avoid serious complications.^[1]

Treatment depends on several factors, including how severe your diarrhoea is, how long it has lasted, and what is causing it. Acute diarrhoea, which lasts less than a week, often requires only simple home care measures. However, if symptoms persist beyond two weeks or if you experience warning signs such as blood in your stool, high fever, or severe abdominal pain, medical evaluation becomes necessary.^[2]

Your age and overall health also influence treatment decisions. Children, older adults, and people with weakened immune systems are at higher risk for complications and may need more careful monitoring. Pregnant women should also consult their healthcare provider before taking any medications for diarrhoea.^[3]

Standard Treatment Approaches

Rehydration: The Foundation of Treatment

Replacing lost fluids and electrolytes is the single most important step in treating diarrhoea. For mild to moderate cases, drinking plenty of liquids is usually sufficient. Water is essential, but it does not replace the salts and sugars your body loses during diarrhoea. That’s why healthcare professionals often recommend specific drinks that contain the right balance of these nutrients.^[11]

Oral rehydration solution (ORS) is a specially formulated drink containing precise amounts of salt and glucose in water. The small intestine absorbs this solution effectively, helping to replace water and electrolytes lost through loose stools. In developing countries, ORS costs just a few cents and has saved countless lives. You can purchase ready-made ORS packets from pharmacies or make your own following healthcare guidance.^[1]

For adults with diarrhoea, good fluid choices include water, fruit juices, sports drinks without caffeine, clear broths, and weak tea. Sports drinks and commercial rehydration solutions work equally well for adults with mild symptoms. You should aim to drink at least eight to ten glasses of fluid per day if possible, increasing this amount if you have severe diarrhoea.^[11]

Children require special attention when it comes to rehydration. Infants should continue breastfeeding or receiving formula as usual. For older children, oral paediatric hydration solutions like Pedialyte are recommended over plain water. These come in liquid form and also as popsicles, which some children find easier to consume. Small amounts should be given frequently rather than large quantities at once.^[11]

Dietary Modifications

What you eat during a bout of diarrhoea can either help or worsen your symptoms. Many people find relief by following the BRAT diet, which stands for bananas, rice, applesauce, and toast. These foods are bland, easy to digest, and can help firm up loose stools. White rice and white toast are preferred over whole grain versions because they are easier on the digestive system.^[14]

Other helpful foods include oatmeal, boiled or baked potatoes without skin, saltine crackers, plain chicken soup, and baked chicken without skin. These simple, mild foods provide nutrition without irritating your already sensitive digestive tract. Eating smaller meals and snacks more frequently, rather than three large meals, can also be easier on your stomach.^[19]

Certain foods should be avoided until your diarrhoea improves. Greasy, fatty, and spicy foods can make symptoms worse. Dairy products other than yoghurt containing probiotics should generally be avoided, as many people develop temporary difficulty digesting lactose during intestinal illness. High-fibre foods like beans, nuts, seeds, dried fruit, bran, and raw vegetables can increase bowel movements, so it’s best to limit these initially. Foods containing artificial sweeteners such as sorbitol, mannitol, or xylitol can also worsen diarrhoea.^[19]

Some people find it helpful to keep a food diary to track which foods seem to trigger or worsen their symptoms. This can be particularly useful if diarrhoea becomes a recurring problem. Once your symptoms have improved, you can gradually return to your normal diet, adding foods back one at a time.^[19]

Antidiarrhoeal Medications

Loperamide (available under brand names like Imodium) is one of the most commonly used over-the-counter antidiarrhoeal medications. It works by slowing down the movement of the intestines, which reduces the frequency of bowel movements and makes stools less watery. Loperamide is an antimotility drug, meaning it decreases the speed at which contents move through your digestive tract, allowing more time for water to be absorbed.^[5]

Bismuth subsalicylate (found in products like Pepto-Bismol) is another over-the-counter option that can reduce diarrhoeal stool output in both adults and children. It works slightly differently from loperamide and can also help with nausea and upset stomach. This medication is particularly useful for preventing traveller’s diarrhoea when visiting areas with questionable water quality.^[5]

While these medications can provide relief, they should not be used in all situations. If you have bloody diarrhoea or a high fever, antidiarrhoeal medications are generally not recommended, as slowing down your intestines could make certain infections worse. These medications are also typically not advised for infants, young children, or people with weakened immune systems unless specifically recommended by a doctor.^[11]

Some combination products contain both loperamide and simethicone, which may provide faster and more complete relief of symptoms compared to either medication alone. Simethicone helps reduce gas and bloating that often accompany diarrhoea.^[13]

Antibiotics and Antiparasitic Medicines

Antibiotics can only treat diarrhoea caused by bacterial infections. They are not effective against viral causes, which are actually the most common reason for acute diarrhoea. If your diarrhoea is caused by harmful bacteria such as Campylobacter, Shigella, or certain strains of E. coli, antibiotics can be very effective. A common choice for bacterial diarrhoea is quinolone antibiotics, which can reduce both the duration and severity of symptoms.^[13]

For traveller’s diarrhoea, which is often caused by bacteria encountered when visiting developing countries with poor sanitation, antibiotics usually belonging to the quinolone family are effective. These medications can significantly shorten the illness, often reducing symptoms from several days to just one or two days.^[13]

If your diarrhoea is caused by parasites such as Giardia lamblia or Cryptosporidium, antiparasitic medications may be prescribed. These organisms are sometimes found in contaminated water sources and can cause persistent diarrhoea that lasts weeks if left untreated. Stool tests are necessary to identify these parasites before treatment can begin.^[10]

A specific situation that requires antibiotic treatment is Clostridioides difficile infection, often called C. diff. This bacterial infection can occur after taking antibiotics for another condition, because the antibiotics kill off normal, protective bacteria in the gut. C. diff can cause severe diarrhoea and requires specific antibiotics for treatment. Healthcare providers typically test for C. diff in people who develop unexplained diarrhoea after three days of hospitalization.^[7]

Probiotics

Probiotics are live microorganisms, often called “good bacteria,” that naturally live in your digestive tract and help maintain a healthy gut environment. When you have diarrhoea, the balance of bacteria in your intestines can be disrupted. Taking probiotics may help restore this balance and shorten the duration of illness.^[5]

Probiotics are found naturally in certain fermented foods like yoghurt, kefir, sauerkraut, kimchi, miso, and some aged cheeses. They are also available as dietary supplements in powder or pill form. Research suggests that probiotics can be helpful for treating acute diarrhoea, and they may also help prevent antibiotic-associated diarrhoea when taken alongside antibiotic treatment.^[5]

While probiotics are generally considered safe for most people, those with weakened immune systems should check with a doctor before using them. Different strains of probiotics may work better for different types of diarrhoea, so speaking with a healthcare provider or pharmacist about which product to choose can be helpful.^[16]

Treatment in Clinical Trials

While standard treatments for diarrhoea are well-established and effective for most cases, researchers continue to explore new approaches, particularly for severe, chronic, or treatment-resistant forms of diarrhoea. Clinical trials are investigating innovative therapies that could offer better outcomes for patients who don’t respond well to conventional treatments or who suffer from diarrhoea related to specific underlying conditions.

Most current clinical research focuses on diarrhoea related to specific diseases rather than acute infectious diarrhoea, which typically resolves with standard care. For example, researchers are studying new treatments for diarrhoea caused by inflammatory bowel diseases like Crohn’s disease and ulcerative colitis, where chronic diarrhoea significantly impacts quality of life. These studies often involve testing novel medications that target the inflammatory processes underlying these conditions.

New probiotic formulations and combinations are also being tested in clinical trials. Researchers are investigating specific bacterial strains and their optimal doses for preventing and treating different types of diarrhoea. Some trials are exploring how probiotics might work synergistically with other treatments to provide better symptom control and faster recovery.

For traveller’s diarrhoea, clinical trials are evaluating new approaches to prevention and treatment, including vaccines against common bacterial causes and new antibiotic regimens that might be more effective or have fewer side effects than current options. Some research is looking at non-antibiotic approaches to prevent traveller’s diarrhoea, which could be particularly valuable given growing concerns about antibiotic resistance.

Trials are also underway examining treatments for diarrhoea in special populations, such as people receiving cancer chemotherapy or radiation therapy, where diarrhoea is a common and sometimes severe side effect that can limit treatment. These studies often test medications that protect the intestinal lining or modify how it responds to treatment.

It’s important to note that while clinical trials offer hope for improved treatments, the standard therapies available today are effective for most people with diarrhoea. Anyone interested in participating in a clinical trial should discuss this option with their healthcare provider to understand potential benefits and risks.

Most common treatment methods

• Rehydration Therapy
  • Oral rehydration solution (ORS) containing balanced salt and glucose to replace lost fluids and electrolytes
  • Drinking water, clear broths, sports drinks, fruit juices, and weak tea
  • Paediatric hydration solutions like Pedialyte for children
  • Intravenous fluids for severe dehydration requiring hospitalization
  • Aim for at least eight to ten glasses of fluid daily when experiencing diarrhoea
• Dietary Management
  • BRAT diet: bananas, rice, applesauce, and toast for easy digestion
  • Plain, easily digestible foods like oatmeal, boiled potatoes, saltine crackers, and plain chicken soup
  • Smaller, more frequent meals instead of large portions
  • Avoiding greasy, fatty, spicy foods, dairy products (except probiotic yoghurt), and high-fibre foods
  • Limiting artificial sweeteners like sorbitol, mannitol, and xylitol
• Antidiarrhoeal Medications
  • Loperamide (Imodium) to slow intestinal movement and reduce stool frequency
  • Bismuth subsalicylate (Pepto-Bismol) to reduce diarrhoeal output and prevent traveller’s diarrhoea
  • Combination products containing loperamide and simethicone for symptom relief and gas reduction
  • Not recommended for bloody diarrhoea, high fever, or use in young children without medical advice
• Antibiotic Therapy
  • Quinolone antibiotics for bacterial infections like traveller’s diarrhoea
  • Specific antibiotics for Campylobacter, Shigella, and certain E. coli infections
  • Targeted treatment for Clostridioides difficile infection
  • Only effective for bacterial causes, not viral infections
• Antiparasitic Treatment
  • Medications for parasitic infections like Giardia lamblia or Cryptosporidium
  • Prescribed after stool testing confirms parasitic cause
  • Important for persistent diarrhoea related to contaminated water exposure
• Probiotics
  • Live microorganisms that restore healthy gut bacteria balance
  • Available in fermented foods like yoghurt, kefir, sauerkraut, and kimchi
  • Available as dietary supplements in powder or pill form
  • May shorten duration of illness and help prevent antibiotic-associated diarrhoea

When to Seek Medical Care

While most diarrhoea improves within a few days with home treatment, certain warning signs indicate you should contact a healthcare provider. Adults should seek medical attention if diarrhoea lasts more than two days, or if they develop a fever above 38.9°C (102°F), severe abdominal or rectal pain, bloody or black stools, or signs of dehydration such as decreased urination, extreme thirst, dry mouth, dizziness, or unusual tiredness.^[3]

For children, parents should not hesitate to contact a healthcare provider, as diarrhoea can be especially dangerous in young children. Seek immediate care if your child has diarrhoea lasting more than 24 hours, shows signs of dehydration (no wet nappies for six hours, no tears when crying, sunken eyes, dry mouth, unusual sleepiness), has a fever, develops bloody stools, or seems unusually irritable or unresponsive. For newborns under three months old, any diarrhoea warrants a call to the doctor.^[6]

Certain groups of people should contact their healthcare provider more readily. This includes older adults over 65, people with weakened immune systems, individuals currently taking antibiotics, pregnant women, and anyone with chronic health conditions like diabetes or kidney disease. These individuals are at higher risk for complications from dehydration and may need closer monitoring or different treatment approaches.^[2]

Special Considerations for Chronic Diarrhoea

When diarrhoea persists for more than four weeks or comes and goes repeatedly, it’s considered chronic and requires medical evaluation. Chronic diarrhoea is not simply an extended version of acute diarrhoea – it often signals an underlying condition that needs specific diagnosis and treatment. Common causes include irritable bowel syndrome, inflammatory bowel diseases like Crohn’s disease or ulcerative colitis, celiac disease, microscopic colitis, and chronic infections.^[7]

Diagnosing chronic diarrhoea usually involves more extensive testing than acute cases. Your doctor may order blood tests to check for inflammation markers, celiac disease, and other conditions. Stool studies can categorize the diarrhoea as watery, fatty, or inflammatory, which helps narrow down possible causes. Depending on initial findings, additional tests might include colonoscopy, upper endoscopy with biopsies, or specialized imaging studies.^[7]

Treatment for chronic diarrhoea depends entirely on the underlying cause. For example, celiac disease requires strict avoidance of gluten, inflammatory bowel diseases may need anti-inflammatory medications or immunosuppressants, and irritable bowel syndrome might respond to dietary changes, stress management, and specific medications. Working closely with a gastroenterologist is often necessary to find the right treatment approach.^[7]

Prevention Strategies

Many cases of diarrhoea can be prevented through good hygiene and safe food practices. Proper hand washing with soap and water is one of the most effective prevention methods, especially before eating or preparing food, after using the toilet, after changing nappies, and after handling animals. When soap and water aren’t available, alcohol-based hand sanitizers can be used, though they’re not as effective against all types of germs that cause diarrhoea.^[1]

Safe food preparation and storage are crucial for preventing foodborne diarrhoea. This means cooking meat, poultry, and eggs thoroughly, keeping raw and cooked foods separated, refrigerating perishable foods promptly, and avoiding foods that have been left out at room temperature for extended periods. When travelling to areas with questionable sanitation, stick to bottled or boiled water, avoid ice cubes, eat only cooked foods, and choose fruits you can peel yourself.^[3]

Vaccinations can prevent some causes of diarrhoea. The rotavirus vaccine, given to infants, has dramatically reduced severe diarrhoea cases in children in countries where it’s widely used. Other vaccines, such as those for cholera and typhoid fever, may be recommended for people travelling to certain regions where these diseases are common.^[1]