Diarrhoea Medication: When to Take It and When It's Better to Wait

2:00 a.m. You wake up with an urgent need to use the bathroom. And again at 3:00. And at 4:00. Your stomach hurts, and every trip to the bathroom is a lottery. Diarrhoea. I don't need to tell you how frustrating and exhausting it is.

Your first thought? "I need to stop this. RIGHT NOW." You reach for medication or google "diarrhoea medication" at 4 a.m. But wait - should you really be stopping diarrhoea? What if the body is defending itself against something harmful?

Diarrhoea is one of those topics nobody wants to talk about, but everyone has to deal with from time to time. And it raises a lot of questions: Should you take medication immediately or wait? What about those probiotics - do they work or are they a placebo? When is it serious enough to see a doctor?

Today I'll break it all down. As a pharmacist, I'll explain how diarrhoea medications work, when it's truly worth taking them, and when it's better to let the body do its job. Because sometimes the best medicine is... patience.

What exactly is diarrhoea?

Let's start with the basics. Diarrhoea is not a disease - it's a symptom.

Medical definition: Passing stool of a loose or watery consistency, more than 3 times in 24 hours.

Sounds simple, but there can be many causes.

Why do we get diarrhoea?

The small and large intestines absorb water from food content. Normally, you absorb about 8-9 litres of fluid per day from your intestines. Stool has a normal consistency because most of the water has been absorbed.

What happens during diarrhoea?

• Too-fast transit - food content moves too quickly, the intestine doesn't have time to absorb water
• Water secretion into the intestine - the intestine actively secretes water and electrolytes (e.g., in enteritis, food poisoning)
• Absorption disorders - damaged mucous membrane doesn't absorb properly (e.g., coeliac disease, Crohn's disease)

Why does the body do this? Often it's a defence mechanism. Diarrhoea helps get rid of toxins, bacteria, viruses - things that shouldn't be in the intestines. It's unpleasant, but it makes sense.

The most common causes of diarrhoea

Knowing the cause is the key to deciding whether to take medication.

1. Viral infections (the most common!)

Rotaviruses, noroviruses, adenoviruses - these are the main culprits behind "stomach flu". Contagious, unpleasant, but usually mild.

Symptoms: Diarrhoea, nausea, vomiting, abdominal pain, sometimes fever

Duration: 1-3 days

Treatment: Rehydration, rest. Antibacterial drugs DO NOT work (it's a virus!)

2. Bacterial infections

Salmonella, Campylobacter, E. coli, Shigella - bacteria from contaminated food or water.

Symptoms: Diarrhoea (often bloody), fever, severe abdominal pain, chills

Duration: 3-7 days (sometimes longer)

Treatment: Most cases resolve on their own. Sometimes antibiotics are needed (determined by a doctor)

3. Food poisoning

Bacterial toxins (e.g., Staphylococcus aureus, Bacillus cereus) in spoiled food.

Symptoms: Sudden diarrhoea, vomiting (a few hours after a meal)

Duration: 12-48 hours

Treatment: Rehydration, let the body cleanse itself

4. Parasites

Giardia, cryptosporidia - from contaminated water, especially when travelling.

Symptoms: Chronic diarrhoea, bloating, weight loss

Duration: Weeks to months (if untreated)

Treatment: Prescription anti-parasitic medication

5. "Traveller's diarrhoea"

A mix of bacteria (most commonly enterotoxigenic E. coli) + dietary changes + travel stress.

Symptoms: Diarrhoea, abdominal cramps

Duration: 3-5 days

Prevention: Avoid raw food, tap water, ice in developing countries

6. Non-infectious causes

• Medications: Antibiotics (destroy the microbiome), painkillers (NSAIDs), blood pressure medications
• Food intolerances: Lactose, fructose, gluten
• Irritable bowel syndrome (IBS): Functional bowel disorders
• Stress and anxiety: Yes, emotions can trigger diarrhoea
• Inflammatory bowel diseases: Crohn's disease, ulcerative colitis

When to stop diarrhoea - loperamide

Let's get to the point. Loperamide is the most popular diarrhoea medication (well known from TV adverts).

How does loperamide work?

It slows intestinal movement (peristalsis), giving the intestine time to absorb water. The stool becomes more formed, and the frequency of bowel movements decreases.

Action: Starts working in 1-2 hours, effects last 4-6 hours

Dosage:

• Adults: 2 capsules (4 mg) initially, then 1 capsule (2 mg) after each loose stool
• Maximum: 8 capsules (16 mg) daily
• Children over 12: Same as adults
• Children under 12: Do NOT give without medical consultation

When does loperamide make sense?

WORTH taking if:

• You have "ordinary" diarrhoea (likely viral), without fever, without blood in stool
• You need to function (work, travel, important meeting) and need temporary relief
• Traveller's diarrhoea - you need to survive a flight or a long bus journey
• Diarrhoea after antibiotics (mild, without blood)

NEVER take loperamide if:

• You have a fever above 38 degrees C
• You see blood or mucus in the stool
• You have severe abdominal pain
• You suspect food poisoning (the body needs to flush out the toxins!)
• Diarrhoea has lasted longer than 2 days without improvement
• You are pregnant or breastfeeding (without medical consultation)
• You have bowel diseases (e.g., ulcerative colitis)

Why these contraindications? Because by stopping diarrhoea, you may trap bacteria, toxins, or viruses in the intestines. This can prolong the illness and lead to serious complications (e.g., toxic megacolon).

Loperamide is not a cure

Important: Loperamide only masks the symptom. It doesn't treat the cause. It's like turning off the fire alarm while the fire is still burning.

Use it wisely - for comfort, when it's safe. Not as a way to ignore the problem.

What about probiotics? Do they work or are they a placebo?

Probiotics are live bacteria that support the gut microbiome. Their popularity is growing, but what does science say?

When do probiotics make sense?

1. Antibiotic-associated diarrhoea (AAD)

Antibiotics kill not only bad bacteria but also the good ones in your gut. The result? Diarrhoea in 5-30% of people.

Studies show: Probiotics (especially Lactobacillus rhamnosus, Saccharomyces boulardii) reduce the risk of antibiotic-associated diarrhoea by 40-60%.

How to use: Start taking probiotics from the first day of antibiotic therapy, continue for 1-2 weeks after finishing. Take a few hours after the antibiotic (not simultaneously).

2. Acute infectious diarrhoea (especially in children)

Probiotics can shorten the duration of diarrhoea by 1 day (from 5 to 4 days).

Most effective strains: Lactobacillus rhamnosus GG, Saccharomyces boulardii

3. Traveller's diarrhoea - prevention

Some studies suggest that probiotics may reduce the risk - but the effect is small.

Are all probiotics equal?

NO. This isn't just "powder with bacteria" where all are the same. What matters is:

• Bacterial strain - different strains have different effects. Lactobacillus rhamnosus GG is not the same as Lactobacillus acidophilus
• Dosage - minimum 5-10 billion CFU (colony forming units) daily
• Viability - the bacteria must be alive and survive stomach acid (look for preparations with a protective coating)

Practical advice: If you're taking antibiotics - probiotics make sense. In acute viral diarrhoea - they may help slightly, but don't expect miracles. They won't replace rehydration.

Check probiotic prices on CheaperForDrug - differences can reach 50% for the same strain and dosage.

The most important thing in treating diarrhoea - rehydration!

This is the absolute number one priority. More important than medication, probiotics, or diets.

Why is dehydration dangerous?

You're losing not only water but also electrolytes (sodium, potassium, chloride). Dehydration can lead to:

• Dizziness, fainting
• Heart rhythm disturbances
• Kidney failure
• In children and the elderly - very rapid deterioration

Signs of dehydration:

• Thirst, dry mouth
• Dark, scanty urine (urinating less frequently)
• Dizziness, especially when standing up
• Fatigue, weakness
• Sunken eyes, decreased skin turgor (in infants - sunken fontanelle)

Be especially vigilant with children! Dehydration progresses faster than in adults.

What to drink?

Best options:

• Oral rehydration solution (ORS) - the medical standard. Contains the ideal ratio of glucose and electrolytes. Available in pharmacies (sachets to dissolve)
• Water + salt + sugar (homemade ORS): 1 litre of water + 1 level teaspoon of salt + 6 level teaspoons of sugar
• Vegetable broth or clear soup - provides salt and fluids
• Herbal teas - chamomile, mint (without sugar or lightly sweetened)

Avoid:

• Fruit juices - lots of sugar, may worsen diarrhoea
• Fizzy drinks - irritate the intestines
• Coffee, alcohol - dehydrate you even more
• Milk - may worsen symptoms (temporary lactose intolerance after diarrhoea)

How much to drink?

Adults: 200-250 ml after each loose stool + 1.5-2 litres of water daily

Children: 50-100 ml after each stool (depending on age)

Drink in small sips, frequently - it's easier to tolerate.

What to eat (and what not to eat) during diarrhoea?

You probably don't have an appetite, but eating is important.

What to eat?

The BRAT diet (Bananas, Rice, Applesauce, Toast):

• Bananas - gentle, provide potassium
• White rice - boiled, without fat, binds the stool
• Applesauce - contains pectin, which binds water
• Toast, crackers - easily digestible

Additionally:

• Boiled potatoes (without butter, skins)
• Boiled carrots
• Boiled chicken (without skin)
• Semolina
• Plain yoghurt (contains probiotics)

What to avoid?

• Fatty, fried food - burdens the intestines
• Spicy seasonings - irritating
• Raw vegetables and fruits (except bananas) - fibre will worsen diarrhoea
• Dairy (except plain yoghurt) - temporary lactose intolerance
• Sugar, sweets - may worsen symptoms
• Fast food, processed food

Important: Don't starve yourself. Eating helps regenerate the intestinal lining. Eat small portions, frequently.

When you MUST see a doctor

Most diarrhoea resolves on its own in 2-3 days. But there are alarming situations.

See a doctor IMMEDIATELY if:

• Blood in the stool (red or black, tarry)
• Fever above 39 degrees C
• Severe, persistent abdominal pain
• Signs of dehydration (dry mouth, no urine, dizziness)
• Diarrhoea has lasted longer than 3 days without improvement
• You've vomited blood or stools look like coffee grounds
• You've recently been abroad (tropics, Africa, Asia) - risk of parasites

In children, infants, and the elderly:

• Diarrhoea lasting longer than 24 hours in infants
• Child hasn't urinated for 6+ hours
• Crying without tears, sunken fontanelle
• Elderly person is confused, weak, not responding normally

Special groups - low threshold for consultation:

• Pregnant women
• People with weakened immunity (HIV, chemotherapy, immunosuppressive drugs)
• People with chronic diseases (diabetes, kidney disease, heart disease)

A doctor can:

• Order a stool culture (detect bacteria, parasites)
• Prescribe antibiotics (if bacterial infection)
• Order intravenous fluid therapy (if severe dehydration)
• Rule out serious conditions (appendicitis, inflammatory bowel diseases)

How to prevent diarrhoea?

Prevention is better than cure. A few simple rules:

1. Wash your hands regularly

Soap + water for 20 seconds. Especially after using the toilet, before eating, after contact with raw meat.

2. Food safety

• Cook meat to the right temperature (poultry minimum 74 degrees C)
• Don't eat expired food
• Wash vegetables and fruits
• Don't leave food at room temperature for a long time

3. Drinking water

In developing countries - drink only bottled water, avoid ice, brush your teeth with bottled water.

4. Avoid raw products when travelling

Raw vegetables, salads, unpasteurised milk, raw meat/fish - risky in countries with lower hygiene standards.

5. Probiotics before travelling?

Some studies suggest that probiotics before and during travel may reduce the risk of traveller's diarrhoea - but the effect is small.

Summary - what to remember?

Rehydration is the priority - drink ORS (oral rehydration solution) or water with salt and sugar

Loperamide - use wisely - take it for mild diarrhoea without fever and blood when you need to function. Do NOT take it with fever, blood in the stool, or severe pain

Probiotics make sense - especially for antibiotic-associated diarrhoea (Saccharomyces boulardii, Lactobacillus rhamnosus GG)

Eat mild foods - BRAT (bananas, rice, applesauce, toast), avoid fatty, spicy, raw food

Let the body do its job - diarrhoea is often a defence mechanism. If mild, without complications - wait 2-3 days

See a doctor - blood in stool, fever above 39 degrees C, severe pain, signs of dehydration, diarrhoea lasting more than 3 days

Children and the elderly = low threshold for consultation - dehydration progresses quickly

Do NOT stop diarrhoea if you suspect food poisoning or bacterial infection with fever

Do NOT underestimate dehydration - it can be dangerous, especially in children and the elderly

Disclaimer

This information is for educational purposes and does not constitute medical advice. If you have severe diarrhoea, blood in the stool, fever, or signs of dehydration - consult a doctor. With children, the elderly, and during pregnancy, always exercise particular caution.

Remember: Diarrhoea is unpleasant but usually a harmless experience. Most cases resolve on their own in 2-3 days. The key is rehydration, a sensible approach to medication, and knowing when to seek help.

Listen to your body. It knows what it's doing. Your job? Provide water, electrolytes, and rest. The body will take care of the rest.