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Diah-Limit 2mg (6 capsules)

Diah-Limit 2mg (6 capsules)

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  • ✔️ Relieves acute diarrhoea with loperamide hydrochloride 2mg
  • ✔️ Slows gut motility to reduce loose stool frequency fast
  • ✔️ Suitable for adults and young people aged 12 and over
  • ✔️ Compact 6-capsule pack ideal for home or travel use
  • ✔️ Works within one to three hours of the first dose

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What Are Diah-Limit Loperamide 2mg Capsules?

 

Diarrhoea can strike at the most inconvenient times — and when it does, you want something that works quickly. Diah-Limit 2mg capsules contain loperamide hydrochloride, a well-established active ingredient used to treat acute diarrhoea in adults and children aged 12 and over. Each pack contains 6 capsules, making it a practical option to keep in your medicine cabinet or travel bag. You can browse our full range of diarrhoea treatments if you need additional support alongside this product.

Acute diarrhoea is defined as loose or watery stools occurring three or more times in 24 hours, and it affects most people at some point. According to the NHS, most cases resolve on their own within a few days, but medication can help reduce the duration and discomfort significantly. Loperamide 2mg capsules are one of the most widely recommended OTC options for this purpose.

 

How Do Diah-Limit 2mg Capsules Work?

 

Loperamide works by acting on opioid receptors in the wall of the large intestine. Unlike opioid painkillers, it does not cross the blood-brain barrier in standard doses, so it has no effect on the central nervous system. Its action is entirely localised to the gut.

  • Slows intestinal motility — reducing how quickly contents move through the bowel
  • Decreases fluid and electrolyte secretion into the intestinal lumen
  • Increases anal sphincter tone, helping to reduce urgency
  • Results in firmer, less frequent stools within a short period of use

This combination of effects means that loperamide addresses both the frequency and the urgency of diarrhoea, giving you more control while your body recovers.

 

Who Is Diah-Limit 2mg Suitable For?

 

Diah-Limit 2mg is suitable for most adults and young people aged 12 and over experiencing acute, uncomplicated diarrhoea. It is particularly useful for:

  • Adults with sudden-onset diarrhoea not associated with fever or blood in stools
  • Travellers experiencing traveller's diarrhoea (short-term use)
  • People who need to manage symptoms during work or social commitments
  • Those who have previously used loperamide without adverse effects

It is not suitable for children under 12, and you should seek medical advice before using it if you are pregnant, breastfeeding, or have a chronic bowel condition such as Crohn's disease or ulcerative colitis. If you also experience stomach cramps alongside your symptoms, our IBS and cramps range may offer complementary support.

 

How Does Diah-Limit Compare to Other Diarrhoea Treatments?

 

Feature Diah-Limit 2mg (6 capsules) Oral Rehydration Salts
Active ingredient Loperamide hydrochloride 2mg Glucose, sodium, potassium salts
Mechanism Slows gut motility Replaces lost fluids and electrolytes
Suitable for children under 12 No Yes (with guidance)
Reduces stool frequency Yes No

 

How Should You Store Diah-Limit 2mg Capsules?

 

Store Diah-Limit 2mg capsules below 25°C in a dry place, away from direct sunlight. Keep the pack out of reach and sight of children at all times. Do not use the capsules after the expiry date printed on the packaging — using out-of-date medicines is not recommended.

As with all medicines, check the packaging for any signs of damage before use. If you are unsure whether this product is right for you, speak to your pharmacist before taking it. Loperamide 2mg capsules are an OTC medicine, but that does not mean they are suitable for everyone in every situation.

This product is a medicine. Speak to your doctor or pharmacist before using if you have an underlying medical condition or are taking other medicines.

Diah-Limit 2mg (6 Capsules) specifications
Treatment category Acute diarrhoea
Active ingredient Loperamide hydrochloride 2mg
Mechanism of action Opioid receptor agonist — slows intestinal motility
Suitable for Adults and children aged 12 and over
Pack size 6 capsules
Strength 2mg per capsule
UK classification General Sale List (GSL)
Drug class Antidiarrhoeal
Preparation Hard capsule
Route of administration Oral

Specifications of Diah-Limit 2mg (6 Capsules)

 

What Is Diah-Limit 2mg and What Is It Used For?

 

Diah-Limit 2mg capsules contain loperamide hydrochloride, an antidiarrhoeal medicine used to treat acute diarrhoea in adults and young people aged 12 and over. Loperamide works locally in the gut to slow bowel movements and reduce the loss of water and salts from the body. It is available over the counter without a prescription and is classified as a General Sale List (GSL) medicine in the UK.

The NHS advises that most cases of acute diarrhoea clear up within a few days, but antidiarrhoeal medicines like loperamide 2mg capsules can help manage symptoms in the meantime, particularly when you need to function normally during the day.

 

What Do You Need to Know Before Using Diah-Limit 2mg?

 

Before taking Diah-Limit 2mg, read the following carefully. Do not take this medicine if any of the following apply to you:

  • You are under 12 years of age
  • You have bloody or black, tarry stools
  • You have a high temperature (fever) alongside diarrhoea
  • You have been diagnosed with ulcerative colitis or another inflammatory bowel condition
  • You are allergic to loperamide hydrochloride or any other ingredient in the capsule
  • You are pregnant or breastfeeding — seek medical advice first
  • You have severe liver disease

The following medicines may interact with loperamide. Tell your pharmacist if you are taking:

  • Quinidine (used for heart rhythm problems or malaria)
  • Ritonavir (an HIV medicine)
  • Itraconazole or ketoconazole (antifungal medicines)
  • Gemfibrozil (used to lower cholesterol)

These medicines can increase the level of loperamide in your blood, which may raise the risk of side effects. Always tell your pharmacist about all medicines you are currently taking.

 

How Should You Use Diah-Limit 2mg Capsules?

 

Always take Diah-Limit 2mg exactly as described below. Do not exceed the stated dose. Swallow capsules whole with a glass of water.

  1. Take 2 capsules (4mg) as your starting dose at the first sign of diarrhoea
  2. After each subsequent loose stool, take 1 capsule (2mg)
  3. Do not take more than 4 capsules (8mg) in 24 hours if self-treating
  4. Do not use for more than 48 hours without speaking to a pharmacist or doctor
  5. Drink plenty of fluids to stay hydrated throughout treatment
Age Group Starting Dose Subsequent Dose Maximum Daily Dose
Adults (18+) 2 capsules (4mg) 1 capsule (2mg) after each loose stool 8 capsules (16mg)
Young people (12–17) 1 capsule (2mg) 1 capsule (2mg) after each loose stool 4 capsules (8mg)
Children under 12 Not suitable — do not use

Staying hydrated is just as important as taking the medicine itself. The NHS recommends drinking plenty of water or oral rehydration fluids when you have diarrhoea to replace lost fluids and salts. You might also find it helpful to explore our sickness and nausea range if you are experiencing vomiting alongside your symptoms.

 

What Are the Possible Side Effects of Diah-Limit 2mg?

 

Like all medicines, Diah-Limit 2mg can cause side effects, although not everyone experiences them. Stop taking the capsules and seek medical advice if your symptoms worsen or do not improve within 48 hours.

Common side effects (may affect up to 1 in 10 people):

  • Constipation
  • Flatulence (wind)
  • Nausea
  • Abdominal cramps or discomfort
  • Headache

Less common side effects (may affect up to 1 in 100 people):

  • Dizziness or drowsiness
  • Dry mouth
  • Skin rash or itching
  • Vomiting
  • Bloating

Serious allergic reactions to loperamide are rare but possible. Seek emergency medical help immediately if you develop swelling of the face, lips, or throat, difficulty breathing, or a severe skin reaction.

 

How Should You Store Diah-Limit 2mg Capsules?

 

  • Store below 25°C in a dry place
  • Keep away from direct sunlight and moisture
  • Keep out of reach and sight of children
  • Do not use after the expiry date printed on the pack
  • Do not dispose of medicines via wastewater or household waste — return unused medicines to your pharmacist

If you are travelling and need to manage gut health on the go, our travel health range includes a variety of products to keep you comfortable wherever you are.

Written and reviewed by our qualified team

Your safety and success are our highest priorities. Our medical team rigorously evaluates every product and piece of advice we provide, ensuring you receive only the most effective, science-backed solutions available.

Frequently Asked Questions

Where can I buy Diah-Limit 2mg capsules online in the UK?

You can buy Diah-Limit 2mg capsules directly from Cured Pharmacy, a GPhC-registered online pharmacy in the UK. No prescription is needed as it is an over-the-counter medicine. It is available for just £1.99 per pack of 6 capsules, making it one of the most affordable loperamide options available online.

How does loperamide work in the body?

Loperamide binds to opioid receptors in the gut wall, slowing down intestinal movement and reducing the secretion of fluids into the bowel. This results in fewer, firmer stools and less urgency. Because it does not cross the blood-brain barrier at normal doses, it has no sedative or painkilling effect on the rest of the body.

How do I take Diah-Limit 2mg step by step?

Adults should start with 2 capsules (4mg), then take 1 capsule (2mg) after each loose stool thereafter. Do not exceed 4 capsules (8mg) in 24 hours when self-treating, and do not continue for more than 48 hours without medical advice. Always swallow capsules whole with a full glass of water.

What is the maximum daily dose of loperamide 2mg capsules?

For adults self-treating acute diarrhoea, the maximum dose is 4 capsules (8mg) in any 24-hour period when buying over the counter. Under medical supervision, the maximum is 8 capsules (16mg) per day. Never exceed the stated dose, as high doses of loperamide can cause serious heart rhythm problems.

What are the side effects of Diah-Limit 2mg capsules?

The most common side effects include constipation, nausea, flatulence, and abdominal cramps. Less commonly, you may experience dizziness, dry mouth, or a skin rash. If you develop any severe or unusual symptoms, stop taking the capsules and speak to your pharmacist or GP promptly.

How do I manage side effects of Diah-Limit 2mg?

Most side effects, such as mild constipation or wind, resolve on their own once you stop taking the medicine. Staying well hydrated and eating small, plain meals can help ease abdominal discomfort. If side effects are persistent or severe, contact your pharmacist for advice before continuing use.

Who should not take Diah-Limit 2mg capsules?

Diah-Limit 2mg is not suitable for children under 12, people with bloody or black stools, those with a high fever alongside diarrhoea, or anyone with severe liver disease. Pregnant or breastfeeding women should seek medical advice before use. People with inflammatory bowel conditions such as ulcerative colitis should also avoid it without medical guidance.

Can I take Diah-Limit 2mg if I am pregnant?

You should not take loperamide during pregnancy without first speaking to your doctor or midwife. The NHS advises that the safety of loperamide in pregnancy has not been fully established, so medical guidance is essential. Your healthcare provider can recommend the safest approach for managing diarrhoea during pregnancy.

What happens if I miss a dose of Diah-Limit 2mg?

Because loperamide is taken as needed after each loose stool rather than on a fixed schedule, a missed dose is not a concern in the traditional sense. Simply take the next capsule after your next loose bowel movement. Never double up doses to compensate.

Can I take Diah-Limit 2mg with other medicines?

Loperamide can interact with certain medicines, including quinidine, ritonavir, itraconazole, and gemfibrozil, which may increase loperamide levels in the blood. Always tell your pharmacist about any other medicines, supplements, or herbal remedies you are taking before starting Diah-Limit 2mg. If you are unsure, our pain relief and gut health team can help advise on safe combinations.

How long does it take for loperamide 2mg to work?

Loperamide typically begins to reduce stool frequency within one to three hours of taking the first dose. Most people notice a significant improvement within 24 hours of starting treatment. If there is no improvement after 48 hours, stop use and consult a pharmacist or GP.

How long can you take Diah-Limit 2mg for?

Diah-Limit 2mg is intended for short-term use only — no more than 48 hours of self-treatment without medical advice. If diarrhoea persists beyond this point, you should seek professional medical assessment, as ongoing symptoms may indicate an underlying condition requiring different treatment.

What are alternatives to Diah-Limit 2mg for diarrhoea?

Alternatives include other loperamide-containing brands such as Imodium, as well as oral rehydration salts to replace lost fluids and electrolytes. For those who cannot take loperamide, bismuth subsalicylate is used in some countries, though it is less commonly available in the UK. Browse our full diarrhoea treatments range for more options.

Is Diah-Limit 2mg suitable for traveller's diarrhoea?

Yes, loperamide 2mg capsules are commonly used to manage traveller's diarrhoea, which is acute diarrhoea caused by consuming contaminated food or water abroad. It is a practical option to pack in your travel kit for short-term symptom relief. However, if you develop a fever or blood in your stools while travelling, seek medical attention rather than self-treating.

What are the latest guidelines on using loperamide for acute diarrhoea?

Current NHS and MHRA guidance confirms that loperamide remains a safe and effective OTC treatment for acute diarrhoea when used at recommended doses. The MHRA has previously issued guidance reminding patients not to exceed the stated dose due to the risk of cardiac side effects at high doses. Always follow the pack instructions and do not use loperamide for longer than recommended without medical advice.

How Should You Use Diah-Limit 2mg Capsules?

Diah-Limit 2mg capsules are taken orally with a full glass of water. Always read the label before use and follow the dosage instructions carefully. Do not crush or chew the capsules — swallow them whole.

Follow these steps when taking Diah-Limit 2mg:

What Is the Correct Dose of Diah-Limit 2mg?

The correct dose depends on your age. Adults take a higher starting dose than young people aged 12 to 17. Never give this medicine to a child under 12 years of age under any circumstances.

When Is the Best Time to Use Diah-Limit 2mg?

Take Diah-Limit 2mg at the first sign of acute diarrhoea — there is no need to wait for symptoms to worsen before starting treatment. The sooner you take the initial dose, the sooner it can begin to slow bowel activity and reduce urgency.

There is no fixed time of day for taking loperamide, as dosing is guided by your symptoms rather than a clock. Simply take one capsule after each loose stool, up to the daily maximum. If you are travelling across time zones, base your dosing on symptoms rather than a schedule.

How Long Can You Use Diah-Limit 2mg For?

Diah-Limit 2mg is intended for short-term use only. You should not self-treat with this medicine for more than 48 hours without seeking medical advice. If your symptoms have not improved within two days, or if they worsen at any point, stop taking the capsules and consult your GP or pharmacist.

Prolonged use of loperamide without medical supervision is not recommended. If you find yourself needing antidiarrhoeal medicine frequently, this may indicate an underlying condition that requires investigation by a healthcare professional.

Do not exceed the recommended dose. If in doubt, speak to your pharmacist.

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What Are the Most Common Side Effects of Diah-Limit 2mg?

Most people tolerate Diah-Limit 2mg well, but as with any medicine, side effects can occur. Common side effects tend to be mild and often resolve once you stop taking the capsules.

  • Constipation
  • Flatulence (wind)
  • Nausea
  • Abdominal cramps or discomfort
  • Headache

What Are the Less Common Side Effects of Diah-Limit 2mg?

Less commonly, some people experience the following side effects. These affect fewer people but are still worth being aware of before you start treatment.

  • Dizziness or drowsiness
  • Dry mouth
  • Skin rash or itching
  • Vomiting
  • Abdominal bloating
  • Indigestion

What Are the Serious Side Effects of Diah-Limit 2mg?

Serious side effects from loperamide are rare when the medicine is used at the recommended dose. However, taking more than the stated dose can cause serious heart rhythm problems, including a prolonged QT interval, which can be life-threatening. This is why it is critical never to exceed the maximum daily dose.

Seek emergency medical help immediately if you experience chest pain, an irregular or rapid heartbeat, fainting, or severe dizziness after taking loperamide. A severe allergic reaction — characterised by swelling of the face, lips, tongue, or throat, difficulty breathing, or a widespread skin rash — is also a medical emergency.

What Should You Do If You Experience Side Effects?

If you experience mild side effects such as constipation or wind, these usually resolve on their own once you stop taking the medicine. Drinking plenty of water and eating small, bland meals can help ease abdominal discomfort during treatment.

If side effects are persistent, worsening, or causing you significant distress, stop taking Diah-Limit 2mg and speak to your pharmacist or GP. You can also report suspected side effects directly to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk.

Can Diah-Limit 2mg Interact With Other Medicines?

Yes. Certain medicines can increase the concentration of loperamide in your bloodstream, raising the risk of side effects — particularly cardiac effects. Known interactions include quinidine, ritonavir, itraconazole, ketoconazole, and gemfibrozil. If you are taking any of these medicines, speak to your pharmacist before using Diah-Limit 2mg.

Always inform your pharmacist or doctor of all medicines, supplements, and herbal remedies you are currently taking. This includes prescription medicines, other OTC products, and vitamins or supplements.

If you are concerned about any side effects, contact your pharmacist or GP immediately.

Patient Information Leaflet

Important - Before taking any medication, it is always important to read the Patient Information Leaflet (PIL)

Written and reviewed by our qualified team

GPhC Number: 2233073
Tarun Kumar

Reviewed by:

Tarun Kumar

Superintendent/ Clinical Lead

📖 Find out more about our team of medical content authors and how we ensure the accuracy of our content with our content guidelines.

Content last updated: 31 Mar 2025

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