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Pepto-Bismol Liquid Suspension

Pepto-Bismol Liquid Suspension

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  • ✔️ Relieves diarrhoea, heartburn, indigestion and nausea simultaneously
  • ✔️ Contains bismuth subsalicylate for targeted gastrointestinal relief
  • ✔️ Liquid format for easy measuring and fast oral absorption
  • ✔️ Suitable for adults and young people aged 16 and over
  • ✔️ Short-term relief without the need for a prescription

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What Is Pepto-Bismol Liquid and How Does It Help?

 

If you've ever been caught off guard by an upset stomach, you'll know how quickly it can derail your day. Pepto-Bismol liquid is a well-known over-the-counter oral suspension that has been used for decades to relieve a range of digestive complaints. It contains the active ingredient bismuth subsalicylate at a concentration of 17.5 mg/ml, and it works across several uncomfortable symptoms at once — which is part of why so many people reach for it. Whether you're dealing with sudden diarrhoea, persistent heartburn, or that queasy feeling that just won't shift, this suspension offers targeted relief without needing a prescription. You can browse our full diarrhoea treatments range if you'd like to compare your options.

Each dose is taken orally, and the liquid format makes it easy to measure and swallow — particularly useful if you're feeling too unwell to manage tablets. At just £4.89, it's an accessible option for most households to keep in the medicine cabinet.

 

How Does Pepto-Bismol Liquid Suspension Work?

 

Bismuth subsalicylate acts through several mechanisms simultaneously, which is why it's effective against more than one symptom at a time. Here's how it works:

  • Coats the stomach lining — bismuth forms a protective layer over the gastric mucosa, helping to shield it from acid and irritants.
  • Reduces inflammation — the salicylate component has mild anti-inflammatory properties that can calm an irritated gut lining.
  • Slows fluid secretion into the bowel — this helps reduce the watery stools associated with diarrhoea.
  • Mild antimicrobial action — bismuth has been shown to inhibit certain bacteria, including some strains associated with traveller's diarrhoea.
  • Neutralises excess stomach acid — providing relief from heartburn and indigestion symptoms.

It's worth noting that this is not an antacid in the traditional sense. It doesn't simply neutralise acid the way calcium carbonate does. Instead, it works more broadly across the digestive system, which is why it's indicated for multiple symptoms.

 

Who Is Pepto-Bismol Liquid Suitable For?

 

This suspension is suitable for adults and young people aged 16 and over. It's particularly useful for those who experience occasional digestive upsets rather than chronic conditions. That said, it's not appropriate for everyone — always read the label carefully before use.

Pepto-Bismol liquid may be a good choice if you:

  • Are an adult (16+) experiencing acute diarrhoea, heartburn, or indigestion
  • Prefer a liquid formulation over tablets or capsules
  • Need relief from multiple digestive symptoms at once
  • Are looking for a short-term remedy while travelling or away from home

 

How Does Pepto-Bismol Liquid Compare to Other Digestive Remedies?

 

Feature Pepto-Bismol Liquid Loperamide (e.g. Imodium)
Active ingredient Bismuth subsalicylate Loperamide hydrochloride
Symptoms treated Diarrhoea, heartburn, nausea, indigestion Diarrhoea only
Suitable age 16 and over 12 and over (varies by product)
Formulation Oral liquid suspension Capsules, tablets, or liquid

 

How Should You Store Pepto-Bismol Liquid and Is It Right for You?

 

Store your Pepto-Bismol liquid suspension below 25°C in a cool, dry place. Do not refrigerate it — cold temperatures can affect the consistency of the suspension. Always keep the bottle tightly closed and out of reach of children. Once opened, check the expiry date on the packaging and do not use it beyond that date.

If you're managing symptoms that might also be linked to irritable bowel syndrome or recurring cramps, it's worth exploring our IBS and cramps collection for additional support options. And remember — Pepto-Bismol liquid is a short-term remedy. If your symptoms persist beyond two days, or worsen at any point, seek medical advice promptly.

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.

Pepto-Bismol Liquid Suspension specifications
Treatment category Gastrointestinal — diarrhoea, heartburn, indigestion, nausea
Active ingredient Bismuth subsalicylate 17.5 mg/ml
Mechanism of action Coats stomach lining, reduces inflammation, slows bowel fluid secretion, mild antimicrobial
Suitable for Adults and young people aged 16 and over
UK classification General Sale List (GSL)
Drug class Bismuth salt / salicylate
Preparation Oral suspension (liquid)
Route of administration Oral
Pack sizes 240 ml

Specifications of Pepto-Bismol Liquid Suspension

 

What Is Pepto-Bismol Liquid Suspension and What Is It Used For?

 

Pepto-Bismol Liquid Suspension is an oral over-the-counter medicine containing bismuth subsalicylate. It is used to relieve the symptoms of diarrhoea, heartburn, indigestion, nausea, and general stomach upset in adults and young people aged 16 and over. It belongs to a class of medicines known as bismuth salts and works locally within the gastrointestinal tract rather than being absorbed systemically in large amounts. The NHS advises that most cases of diarrhoea and indigestion can be managed with over-the-counter remedies and self-care measures at home.

 

What Do You Need to Know Before Using Pepto-Bismol Liquid?

 

Before taking this medicine, it's important to check whether it is appropriate for you. Do not use Pepto-Bismol liquid if any of the following apply:

  • You are allergic to aspirin, other salicylates, or any ingredient in the product
  • You are under 16 years of age
  • You are pregnant, especially in the third trimester
  • You are breastfeeding
  • You have a bleeding disorder or a stomach ulcer
  • You have been told to avoid aspirin-containing products by your doctor
  • You have kidney disease
  • You have gout

The following medicines may interact with Pepto-Bismol liquid. Tell your pharmacist or doctor if you are taking:

  • Anticoagulants such as warfarin — risk of increased bleeding
  • Aspirin or other NSAIDs — additive salicylate effect
  • Methotrexate — salicylates may increase methotrexate toxicity
  • Medicines for diabetes (e.g. insulin or sulphonylureas) — salicylates may affect blood glucose
  • Tetracycline antibiotics — bismuth may reduce their absorption

 

How Should You Use Pepto-Bismol Liquid Suspension?

 

Always use this medicine exactly as described on the label or as directed by your pharmacist. Do not exceed the stated dose.

  1. Shake the bottle well before each use.
  2. Measure 30 ml using the measuring cup provided with the pack.
  3. Swallow the measured dose.
  4. Repeat every 30 to 60 minutes if symptoms continue.
  5. Do not take more than 8 doses (240 ml) in any 24-hour period.
  6. Do not use for more than 2 consecutive days without medical advice.
Indication Age Group Dose Frequency
Diarrhoea, heartburn, indigestion, nausea Adults and young people 16+ 30 ml Every 30–60 minutes, max 8 doses in 24 hours
Children under 16 Not applicable Do not use — not suitable

If you are also experiencing symptoms of nausea alongside your digestive upset, you may find it helpful to browse our sickness and nausea collection for complementary options.

 

What Are the Possible Side Effects of Pepto-Bismol Liquid?

 

Like all medicines, Pepto-Bismol liquid can cause side effects, although not everyone experiences them. The NHS notes that most side effects from over-the-counter digestive medicines are mild and temporary.

Common side effects:

  • Black or very dark stools — caused by bismuth reacting with sulphur in the gut; harmless and temporary
  • Darkening or blackening of the tongue — also harmless and reversible

Less common side effects:

  • Tinnitus (ringing in the ears) — may indicate salicylate sensitivity; stop use and seek advice
  • Constipation
  • Nausea (paradoxically, in some individuals)
  • Allergic reactions such as rash, itching, or swelling — seek immediate medical attention if these occur

Stop taking Pepto-Bismol and contact your GP or pharmacist if you develop tinnitus, as this can be a sign of salicylate toxicity.

 

How Should You Store Pepto-Bismol Liquid Suspension?

 

Correct storage helps maintain the effectiveness and safety of the medicine. Follow these guidelines:

  • Store below 25°C in a cool, dry place
  • Do not refrigerate or freeze
  • Keep the bottle tightly closed when not in use
  • Keep out of the sight and reach of children
  • Do not use after the expiry date printed on the label
  • Do not dispose of medicines via wastewater or household waste — return unused medicine to your pharmacy

If you're stocking up your home medicine cabinet, it's also worth checking our indigestion treatments collection for other products that complement digestive health management.

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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 Pepto-Bismol liquid online in the UK?

You can buy Pepto-Bismol Liquid Suspension online from Cured Pharmacy, a GPhC-registered UK online pharmacy, for just £4.89. It is available without a prescription and is dispatched quickly to your door. It's also stocked in most UK supermarkets and high street pharmacies.

How does Pepto-Bismol liquid work in the body?

Pepto-Bismol liquid contains bismuth subsalicylate, which coats and soothes the stomach lining, reduces inflammation, and slows the secretion of excess fluid into the bowel. It also has mild antimicrobial properties that can help combat certain bacteria responsible for stomach upsets. This multi-action approach is why it relieves several symptoms at once.

How do I take Pepto-Bismol liquid step by step?

Shake the bottle well, then measure 30 ml using the cup provided and swallow the dose. You can repeat this every 30 to 60 minutes if your symptoms continue, but do not exceed 8 doses in any 24-hour period. Always read the label before use and do not take it for more than 2 consecutive days without speaking to a pharmacist.

What is the correct dose of Pepto-Bismol liquid for adults?

The recommended adult dose is 30 ml taken orally, which can be repeated every 30 to 60 minutes as needed. The maximum dose is 8 doses (240 ml total) within any 24-hour period. Do not exceed this amount, and do not use the product for longer than 2 days without medical guidance.

Can Pepto-Bismol liquid cause black stools?

Yes — black or very dark stools are a well-known and harmless side effect of bismuth subsalicylate. This happens because bismuth reacts with sulphur compounds naturally present in the digestive tract. Your stools will return to their normal colour once you stop taking the medicine.

Is Pepto-Bismol liquid safe to take during pregnancy?

Pepto-Bismol is not recommended during pregnancy, particularly in the third trimester, because bismuth subsalicylate is related to aspirin and may pose risks to the developing baby. If you are pregnant and experiencing digestive symptoms, speak to your GP or midwife before taking any over-the-counter medicine. There are safer alternatives available that your healthcare provider can recommend.

Can children take Pepto-Bismol liquid?

No — Pepto-Bismol liquid is not suitable for children under 16 years of age. This is because bismuth subsalicylate contains a salicylate compound, and giving salicylates to children under 16 carries a risk of a rare but serious condition called Reye's syndrome. If your child has diarrhoea or an upset stomach, visit our baby and toddler health collection for age-appropriate options.

How long can you take Pepto-Bismol liquid for?

Pepto-Bismol liquid is intended for short-term use only — no more than 2 consecutive days. If your symptoms have not improved after 2 days, or if they worsen at any point, you should stop using the product and consult your GP or pharmacist. Prolonged use without medical supervision is not recommended.

What medicines interact with Pepto-Bismol liquid?

Pepto-Bismol liquid can interact with several medicines, including warfarin and other anticoagulants, aspirin, methotrexate, diabetes medicines, and tetracycline antibiotics. If you are taking any prescription or over-the-counter medicines, always check with your pharmacist before using Pepto-Bismol. This is especially important if you are on long-term medication.

What are the alternatives to Pepto-Bismol liquid for diarrhoea?

If you need relief specifically from diarrhoea, loperamide (sold as Imodium) is a commonly used alternative that works by slowing gut motility. For heartburn and indigestion, antacids such as Gaviscon or Rennie may be more appropriate. You can explore a wider range of options in our diarrhoea treatments collection to find the right product for your symptoms.

What is the best time to take Pepto-Bismol liquid?

Pepto-Bismol liquid can be taken as soon as symptoms begin — there is no specific time of day requirement. For heartburn or indigestion, taking it after meals or when symptoms flare is most practical. For diarrhoea, take it at the onset of loose stools and repeat as directed if symptoms continue.

What happens if I take too much Pepto-Bismol liquid?

Taking more than the recommended dose increases the risk of salicylate toxicity, which can cause symptoms such as ringing in the ears (tinnitus), dizziness, and nausea. If you think you or someone else has taken too much, contact NHS 111 or go to your nearest A&E immediately. Always keep medicines out of reach of children.

Can I take Pepto-Bismol liquid if I am allergic to aspirin?

No — if you have a known allergy to aspirin or other salicylates, you should not take Pepto-Bismol liquid. Bismuth subsalicylate contains a salicylate component that could trigger a similar allergic reaction. Speak to your pharmacist about suitable alternatives for your symptoms.

Does Pepto-Bismol liquid help with traveller's diarrhoea?

Pepto-Bismol has been used to help manage traveller's diarrhoea due to its mild antimicrobial properties against certain gut bacteria. However, it is not a substitute for oral rehydration therapy, which is the primary treatment recommended by the NHS for diarrhoea. If you're preparing for travel, our travel health collection has a range of products to help you stay well abroad.

What are the latest findings on bismuth subsalicylate for digestive symptoms?

Bismuth subsalicylate has been studied for decades and remains a recognised option for short-term management of diarrhoea, heartburn, and indigestion in adults. Current evidence supports its use as a safe and effective short-term remedy when taken as directed. For the most up-to-date clinical guidance, the BNF and NHS provide regularly reviewed information on its use and safety profile.

How Should You Use Pepto-Bismol Liquid Suspension?

Pepto-Bismol Liquid Suspension is taken orally and is straightforward to use at home. Always shake the bottle well before measuring your dose, as the suspension can settle between uses. Follow these steps each time you take a dose:

What Is the Correct Dose of Pepto-Bismol Liquid?

The dose varies only by age eligibility — this product is not suitable for anyone under 16. Always follow the dosage instructions on the label and do not exceed the maximum daily dose under any circumstances.

When Is the Best Time to Use Pepto-Bismol Liquid?

There is no fixed time of day for taking Pepto-Bismol liquid — you should take it as soon as your symptoms begin. For heartburn or indigestion, this is typically after meals or when discomfort flares. For diarrhoea or nausea, take it at the onset of symptoms and repeat as directed if they continue. Taking it promptly at the first sign of symptoms generally gives the best results.

How Long Can You Use Pepto-Bismol Liquid For?

Pepto-Bismol liquid is designed for short-term use only. You should not use it for more than 2 consecutive days without first speaking to a doctor or pharmacist. If your symptoms have not improved within 2 days, or if they worsen at any point during treatment, stop using the product and seek medical advice. Prolonged use is not recommended and may mask an underlying condition that requires proper diagnosis and treatment.

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 Pepto-Bismol Liquid?

Most people who take Pepto-Bismol liquid tolerate it well, but some side effects can occur. The most frequently reported ones are related to the bismuth content of the medicine and are harmless.

  • Black or very dark stools — caused by bismuth reacting with sulphur in the gut; completely harmless and reversible
  • Darkening or blackening of the tongue — also temporary and resolves after stopping the medicine

These colour changes can be alarming if you're not expecting them, but they are a well-documented and benign effect of bismuth subsalicylate. They do not require you to stop treatment unless you are concerned.

What Are the Less Common Side Effects of Pepto-Bismol Liquid?

Less frequently, some people may experience other side effects. If any of the following occur, stop using the medicine and speak to your pharmacist or GP.

  • Tinnitus (ringing or buzzing in the ears) — this may indicate salicylate sensitivity and warrants prompt medical advice
  • Constipation — bismuth can slow bowel movements in some individuals
  • Nausea — paradoxically, some people may feel more nauseous after taking the suspension
  • Headache

What Are the Serious Side Effects of Pepto-Bismol Liquid?

Serious side effects are rare but can occur, particularly if the medicine is taken in excess or by people who are sensitive to salicylates. Seek immediate medical attention if you experience any of the following:

  • Signs of an allergic reaction — rash, itching, swelling of the face, lips, or throat, or difficulty breathing
  • Severe dizziness or confusion
  • Rapid breathing or unusual fatigue — possible signs of salicylate toxicity
  • Blood in your stools or vomit

What Should You Do If You Experience Side Effects of Pepto-Bismol Liquid?

For mild side effects such as dark stools or tongue discolouration, no action is needed — simply continue as directed and the effects will resolve when you stop taking the medicine. If you develop tinnitus, stop use immediately and contact your pharmacist, as this can be an early sign of salicylate toxicity. For any serious or unexpected reaction, contact NHS 111 or attend your nearest A&E without delay.

Can Pepto-Bismol Liquid Interact With Other Medicines?

Yes — bismuth subsalicylate can interact with several medicines. The salicylate component behaves similarly to aspirin in the body, which means it can enhance the effects of anticoagulants like warfarin, increasing bleeding risk. It may also interact with methotrexate, diabetes medicines, and tetracycline antibiotics. Always tell your pharmacist about all medicines you are currently taking before starting Pepto-Bismol liquid.

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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