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Benylin Mucus Cough - 16 Tablets

Benylin Mucus Cough - 16 Tablets

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  • ✔️ Loosens and clears chest mucus for productive cough relief
  • ✔️ Guaifenesin 200mg expectorant in convenient tablet form
  • ✔️ Suitable for adults and children aged 12 and over
  • ✔️ Relieves chesty coughs caused by colds and flu
  • ✔️ 16-tablet pack provides up to four days of treatment

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What Are Benylin Mucus Cough Tablets?

 

If you've been dealing with a chesty cough that just won't shift, you'll know how exhausting it can be. Benylin mucus cough tablets are an over-the-counter expectorant medicine designed to help loosen and clear mucus from your airways, making it easier to cough productively and breathe more freely. Each pack contains 16 tablets, giving you a convenient course of treatment to keep at home during cold and flu season. You can also browse our wider range of cold and flu remedies if you need additional symptom relief alongside your cough treatment.

Chesty coughs are one of the most common reasons people visit a pharmacist in the UK. They typically develop when excess mucus builds up in the lower respiratory tract — often following a cold, flu, or mild chest infection. The NHS notes that most coughs caused by a cold or flu will clear up on their own within three weeks, but an expectorant can help ease the discomfort in the meantime.

 

How Do Benylin Mucus Cough Tablets Work?

 

The active ingredient in these tablets is guaifenesin 200mg. Guaifenesin is a well-established expectorant that works by:

  • Increasing the volume of secretions in the respiratory tract
  • Reducing the viscosity (stickiness) of mucus, making it thinner and easier to move
  • Stimulating the cilia — tiny hair-like structures lining the airways — to help transport mucus upward and out
  • Facilitating a more productive cough so mucus is cleared more effectively

Essentially, guaifenesin doesn't suppress your cough — it makes your cough work better. That's an important distinction. If you have a dry, tickly cough rather than a chesty one, a different type of cough remedy would be more appropriate.

 

Who Should Use Benylin Mucus Cough Tablets?

 

These tablets are suitable for adults and children aged 12 and over who are experiencing a chesty, productive cough with mucus. They're particularly useful when:

  • You have a chesty cough following a cold or flu
  • Mucus feels thick and difficult to clear
  • You want a tablet-form expectorant rather than a liquid syrup
  • You need a discreet, portable option to take during the day

They are not suitable for children under 12, and you should speak to your GP before using them if you have asthma, chronic bronchitis, or any other persistent respiratory condition. Pregnant or breastfeeding women should also seek medical advice before use.

 

How Do Benylin Mucus Cough Tablets Compare to Alternatives?

 

Feature Benylin Mucus Cough Tablets Robitussin Chesty Cough Syrup
Active ingredient Guaifenesin 200mg per tablet Guaifenesin 100mg per 5ml
Form Tablet (easy to carry) Liquid syrup
Suitable age 12 years and over 12 years and over
Pack size 16 tablets 100ml or 250ml bottle

 

How Should You Store Benylin Mucus Cough Tablets?

 

Store your Benylin mucus cough tablets below 25°C in a dry place, away from direct sunlight. Keep them out of reach and sight of children at all times. Do not use the tablets after the expiry date printed on the packaging. If you're managing multiple medicines at home — for example, alongside products from our ear, nose and throat range — it's good practice to keep all medicines in a dedicated, secure location.

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.

Benylin Mucus Cough 16 Tablets specifications
Treatment category Cough remedies / Expectorants
Mechanism of action Expectorant — reduces mucus viscosity and increases respiratory secretions
Effective for Chesty, productive coughs with mucus
Suitable for Adults and children aged 12 and over
Active ingredient Guaifenesin 200mg per tablet
Pack size 16 tablets
UK classification General Sale List (GSL)
Drug class Expectorant
Preparation Film-coated tablet
Route of administration Oral

Specifications of Benylin Mucus Cough 16 Tablets

 

What Is Benylin Mucus Cough and What Is It Used For?

 

Benylin Mucus Cough 16 Tablets contain guaifenesin, a medicine classified as an expectorant. It is used to relieve chesty coughs where mucus (phlegm) is present in the airways. This type of cough is sometimes called a productive cough because the body is actively trying to expel mucus from the lungs and bronchial tubes. The NHS describes a chesty cough as one where you bring up mucus or phlegm when you cough — quite different from a dry or tickly cough, which requires a different treatment approach.

These tablets are intended for short-term use in adults and young people aged 12 and over. They do not treat the underlying cause of a cough — such as a bacterial infection — but they do help make the symptom more manageable while your body recovers.

 

What Do You Need to Know Before Using Benylin Mucus Cough Tablets?

 

Before taking these tablets, read the following carefully. Do not take them if any of the contraindications below apply to you.

Do not take if you:

  • Are under 12 years of age
  • Are allergic to guaifenesin or any other ingredient in the tablets
  • Have a chronic or persistent cough caused by asthma, emphysema, or chronic bronchitis
  • Have a cough that produces excessive amounts of phlegm
  • Are pregnant or breastfeeding (seek medical advice first)

Speak to your pharmacist or GP before use if you:

  • Have kidney or liver problems
  • Are taking any other medicines, including herbal remedies
  • Have a high temperature (fever) above 38°C alongside your cough
  • Have had your cough for more than 7 days without improvement

Known drug interactions:

  • No clinically significant interactions are documented at standard OTC doses of guaifenesin
  • Always inform your pharmacist of all medicines you are currently taking

 

How Should You Use Benylin Mucus Cough Tablets?

 

  1. Read the patient information leaflet inside the pack before use
  2. Swallow 2 tablets whole with a full glass of water
  3. Repeat up to 4 times daily, leaving at least 4 hours between doses
  4. Do not take more than 8 tablets (1,600mg guaifenesin) in any 24-hour period
  5. Drink plenty of fluids throughout the day to help thin mucus further
  6. If symptoms do not improve within 7 days, consult your GP
Age Group Dose Frequency Maximum daily dose
Adults and children 12+ 2 tablets (400mg) Up to 4 times daily 8 tablets (1,600mg)
Children under 12 Not suitable — do not use

 

What Are the Possible Side Effects of Benylin Mucus Cough Tablets?

 

Like all medicines, Benylin Mucus Cough tablets can cause side effects, although not everyone will experience them. The NHS advises that you should always report side effects to your pharmacist or GP if they concern you.

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

  • Nausea
  • Stomach discomfort or upset
  • Headache
  • Dizziness

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

  • Vomiting
  • Skin rash or itching
  • Drowsiness

Stop taking the tablets and seek immediate medical attention if you develop signs of a serious allergic reaction, such as swelling of the face, lips, or throat, difficulty breathing, or a severe skin reaction. If you're also managing other symptoms such as sinus congestion or a sore throat, you may find our ear, nose and throat collection helpful for complementary products.

 

How Should You Store Benylin Mucus Cough Tablets?

 

  • 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 carton
  • Do not store in a bathroom or near a sink
  • Do not dispose of medicines via wastewater or household waste — return unused tablets to your pharmacist

If you're stocking up your home medicine cabinet, you might also want to explore our pain relief range for paracetamol or ibuprofen to manage any associated aches and fever during a cold or flu episode.

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 Benylin Mucus Cough tablets online in the UK?

You can buy Benylin Mucus Cough 16 Tablets directly from Cured Pharmacy, a GPhC-registered UK online pharmacy, for just £4.89. Ordering online is quick and straightforward, with fast delivery to your home address. No prescription is required as this is a General Sale List medicine.

How do Benylin Mucus Cough tablets work in the body?

The active ingredient, guaifenesin, works as an expectorant by thinning and loosening mucus in the airways, making it easier to cough up and clear. It increases the volume of respiratory secretions and reduces their stickiness. This helps your cough become more productive so you can shift the mucus more effectively.

How do I take Benylin Mucus Cough tablets step by step?

Take 2 tablets with a full glass of water, up to 4 times a day, leaving at least 4 hours between each dose. Do not exceed 8 tablets in any 24-hour period. Drinking plenty of fluids throughout the day can help the medicine work more effectively by keeping mucus hydrated and easier to clear.

What is the correct dose of Benylin Mucus Cough tablets for adults?

Adults and young people aged 12 and over should take 2 tablets (400mg guaifenesin) up to 4 times daily. The maximum dose in 24 hours is 8 tablets, which equals 1,600mg of guaifenesin. Always follow the dosage instructions on the pack and do not exceed the stated dose.

What are the side effects of Benylin Mucus Cough tablets?

Side effects are uncommon but can include nausea, stomach upset, headache, and dizziness. Less commonly, some people may experience vomiting or a skin rash. If you develop any signs of an allergic reaction — such as swelling of the face or difficulty breathing — stop taking the tablets immediately and seek urgent medical help.

Who should not take Benylin Mucus Cough tablets?

These tablets are not suitable for children under 12 years of age, or for anyone with a chronic cough caused by conditions such as asthma, emphysema, or chronic bronchitis. People who are pregnant, breastfeeding, or allergic to guaifenesin should also avoid them without first speaking to a doctor or pharmacist. Always check the full list of contraindications on the patient information leaflet.

Can I take Benylin Mucus Cough tablets with other medicines?

No clinically significant drug interactions have been documented for guaifenesin at standard over-the-counter doses. However, you should always tell your pharmacist about any other medicines, supplements, or herbal remedies you are taking before starting a new treatment. This is especially important if you are taking medicines for other conditions such as those found in our cold and flu range.

How long can I take Benylin Mucus Cough tablets for?

You should not use these tablets for more than 7 days without consulting a doctor. If your cough persists beyond a week, worsens, or is accompanied by a high fever, chest pain, or blood in your phlegm, seek medical advice promptly. Prolonged coughs can sometimes indicate an underlying condition that needs proper assessment.

What happens if I miss a dose of Benylin Mucus Cough tablets?

If you miss a dose, simply take the next dose when it is due — do not double up to make up for a missed one. These tablets are taken as needed for symptom relief rather than on a strict schedule, so missing a single dose is unlikely to affect your overall recovery. Just ensure you leave at least 4 hours between doses.

Are Benylin Mucus Cough tablets suitable for children?

No — these tablets are only suitable for adults and young people aged 12 and over. They should never be given to children under 12. If you need cough relief for a younger child, speak to your pharmacist who can recommend an age-appropriate product. You can also browse our baby and toddler range for suitable options.

What is the difference between a chesty cough and a dry cough?

A chesty cough is a productive cough where you bring up mucus or phlegm from the airways — this is the type that Benylin Mucus Cough tablets are designed to treat. A dry or tickly cough produces no mucus and is usually caused by irritation or inflammation in the throat. Using an expectorant for a dry cough would not be appropriate, and a different type of cough remedy should be used instead.

What are the alternatives to Benylin Mucus Cough tablets?

Alternatives include other guaifenesin-containing products such as Robitussin Chesty Cough syrup or own-brand expectorant syrups available from pharmacies. Some people also find combination cold and flu remedies helpful if they have multiple symptoms alongside their cough. Speak to your pharmacist to find the most suitable option for your specific symptoms.

Can I take Benylin Mucus Cough tablets if I am pregnant?

You should not take these tablets during pregnancy without first consulting your GP or midwife. The safety of guaifenesin during pregnancy has not been fully established, and a healthcare professional will be able to advise on the safest approach to managing your cough. Self-medicating during pregnancy always warrants extra caution.

Is there any research supporting guaifenesin as a cough expectorant?

Guaifenesin has been used as an expectorant for decades and is recognised by regulatory bodies including the MHRA as an active ingredient for the symptomatic relief of chesty coughs. It is listed in the British National Formulary (BNF) as an expectorant, though evidence for its clinical efficacy in reducing cough frequency is considered modest. It remains one of the most widely used OTC cough treatments in the UK.

Do Benylin Mucus Cough tablets make you drowsy?

Drowsiness is listed as a less common side effect of these tablets, but it is not a primary effect of guaifenesin. Unlike some other cough medicines that contain antihistamines or codeine, guaifenesin does not have a sedating mechanism. However, if you do feel drowsy after taking them, avoid driving or operating machinery until you know how the medicine affects you.

How Should You Use Benylin Mucus Cough Tablets?

Always read the patient information leaflet supplied with your pack before taking these tablets. They are intended for oral use only — swallow them whole with a full glass of water. Drinking extra fluids throughout the day is strongly recommended, as staying well hydrated helps thin mucus further and supports the expectorant action of guaifenesin.

Follow these steps each time you take a dose:

What Is the Correct Dose of Benylin Mucus Cough Tablets?

The dose varies by age. Do not give these tablets to anyone under 12 years old. Always follow the dosage guidance below and never exceed the maximum daily dose, regardless of how severe your symptoms feel.

When Is the Best Time to Use Benylin Mucus Cough Tablets?

There is no single "best" time of day to take these tablets — they can be taken at any time, provided you space doses at least 4 hours apart. Many people find it helpful to take a dose in the morning when mucus tends to accumulate overnight, and again during the day as needed. Taking a dose with food may help reduce the chance of stomach upset.

Avoid taking your last dose too close to bedtime if you find that a productive cough disturbs your sleep. In that case, speak to your pharmacist about whether a different formulation might be more suitable for night-time use.

How Long Can You Use Benylin Mucus Cough Tablets For?

These tablets are intended for short-term use only. Do not use them for more than 7 consecutive days without seeking medical advice. Most chesty coughs associated with a cold or flu will begin to improve within this timeframe as your immune system clears the infection.

If your cough persists beyond 7 days, worsens significantly, or is accompanied by symptoms such as a high fever, chest pain, shortness of breath, or blood-stained phlegm, you should stop taking the tablets and contact your GP promptly. These symptoms may indicate a more serious condition such as a chest infection or pneumonia that requires medical treatment.

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

How Should You Use Benylin Mucus Cough Tablets?

Always read the patient information leaflet supplied with your pack before taking these tablets. They are intended for oral use only — swallow them whole with a full glass of water. Drinking extra fluids throughout the day is strongly recommended, as staying well hydrated helps thin mucus further and supports the expectorant action of guaifenesin.

Follow these steps each time you take a dose:

What Is the Correct Dose of Benylin Mucus Cough Tablets?

The dose varies by age. Do not give these tablets to anyone under 12 years old. Always follow the dosage guidance below and never exceed the maximum daily dose, regardless of how severe your symptoms feel.

When Is the Best Time to Use Benylin Mucus Cough Tablets?

There is no single "best" time of day to take these tablets — they can be taken at any time, provided you space doses at least 4 hours apart. Many people find it helpful to take a dose in the morning when mucus tends to accumulate overnight, and again during the day as needed. Taking a dose with food may help reduce the chance of stomach upset.

Avoid taking your last dose too close to bedtime if you find that a productive cough disturbs your sleep. In that case, speak to your pharmacist about whether a different formulation might be more suitable for night-time use.

How Long Can You Use Benylin Mucus Cough Tablets For?

These tablets are intended for short-term use only. Do not use them for more than 7 consecutive days without seeking medical advice. Most chesty coughs associated with a cold or flu will begin to improve within this timeframe as your immune system clears the infection.

If your cough persists beyond 7 days, worsens significantly, or is accompanied by symptoms such as a high fever, chest pain, shortness of breath, or blood-stained phlegm, you should stop taking the tablets and contact your GP promptly. These symptoms may indicate a more serious condition such as a chest infection or pneumonia that requires medical treatment.

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

What Are the Most Common Side Effects of Benylin Mucus Cough Tablets?

Most people who take Benylin Mucus Cough tablets tolerate them well. However, as with any medicine, side effects are possible. Common side effects — those that may affect up to 1 in 10 people — are generally mild and tend to resolve on their own without needing to stop treatment.

  • Nausea
  • Stomach discomfort or upset
  • Headache
  • Dizziness

Taking the tablets with food or a full glass of water may help reduce the likelihood of stomach-related side effects. If nausea is persistent, speak to your pharmacist.

What Are the Less Common Side Effects of Benylin Mucus Cough Tablets?

Less common side effects — affecting up to 1 in 100 people — are less frequently reported but worth being aware of. If you notice any of the following, consider stopping the tablets and seeking advice from your pharmacist or GP.

  • Vomiting
  • Skin rash or itching
  • Drowsiness
  • General feeling of being unwell

Drowsiness is not a primary effect of guaifenesin, but if you do feel unusually tired after taking these tablets, avoid driving or operating heavy machinery until you know how the medicine affects you.

What Are the Serious Side Effects of Benylin Mucus Cough Tablets?

Serious side effects are rare but require immediate medical attention. Stop taking the tablets straight away and call 999 or go to your nearest A&E if you experience any of the following signs of a serious allergic reaction (anaphylaxis):

  • Swelling of the face, lips, tongue, or throat
  • Difficulty breathing or swallowing
  • Severe skin reaction, including widespread rash or blistering
  • Sudden drop in blood pressure causing faintness or collapse

These reactions are very uncommon, but they are a medical emergency. Do not wait to see if symptoms improve — act immediately.

What Should You Do If You Experience Side Effects?

For mild side effects such as nausea or headache, try taking the tablets with food and plenty of water. If side effects are troublesome or do not settle within a day or two, stop taking the tablets and speak to your pharmacist. You can also report suspected side effects directly to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk — this helps improve medicine safety for everyone.

Never take more than the recommended dose in an attempt to speed up recovery. Exceeding the stated dose increases the risk of side effects without providing additional benefit.

Can Benylin Mucus Cough Tablets Interact With Other Medicines?

No clinically significant drug interactions have been documented for guaifenesin at standard over-the-counter doses. That said, you should always inform your pharmacist or GP of all medicines you are currently taking — including prescription medicines, over-the-counter products, vitamins, supplements, and herbal remedies. This is particularly important if you are taking medicines for heart conditions, blood pressure, or mental health, as some combinations can have unexpected effects.

If you are unsure whether Benylin Mucus Cough tablets are safe to take alongside your current medicines, ask your pharmacist before starting treatment.

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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