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Benylin 4 Flu - 24 Tablets

Benylin 4 Flu - 24 Tablets

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  • ✔️ Targets fever, aches, congestion, and runny nose simultaneously
  • ✔️ Contains paracetamol, pseudoephedrine, and diphenhydramine in one tablet
  • ✔️ Suitable for adults and young people aged 12 and over
  • ✔️ Starts relieving symptoms within 30 to 60 minutes of taking
  • ✔️ 24-tablet pack provides up to six days of symptom relief

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What Are Benylin 4 Flu Tablets and How Do They Help?

 

When flu hits, it rarely arrives with just one symptom. You get the headache, the blocked nose, the aching limbs, and the fever — often all at once. Benylin 4 Flu tablets are designed to tackle that full picture in a single tablet, combining three active ingredients to address multiple symptoms simultaneously. Each pack contains 24 tablets, giving you enough to see through the worst days of illness without needing to reorder. You can find them alongside other trusted remedies in our cold and flu collection.

Flu is caused by influenza viruses and typically brings on sudden fever, muscle aches, headache, and respiratory symptoms. The NHS notes that flu symptoms tend to come on quickly and feel more severe than a common cold. Benylin 4 Flu tablets are an over-the-counter (OTC) medicine, meaning you do not need a prescription to purchase them.

 

How Do Benylin 4 Flu Tablets Work?

 

The tablets work through a combination of three pharmacologically distinct active ingredients, each targeting a different symptom pathway:

  • Paracetamol 500 mg — an analgesic and antipyretic that reduces fever and relieves headache and body aches by inhibiting prostaglandin synthesis in the central nervous system.
  • Pseudoephedrine hydrochloride 30 mg — a sympathomimetic decongestant that causes vasoconstriction in the nasal mucosa, reducing swelling and congestion so you can breathe more easily.
  • Diphenhydramine hydrochloride 12.5 mg — a first-generation antihistamine that crosses the blood-brain barrier, helping to dry up a runny nose and reduce sneezing, though it can also cause drowsiness.

Together, these three ingredients address the most disruptive flu symptoms without requiring you to take multiple separate medicines. That said, because the tablet already contains paracetamol, you must not take any other paracetamol-containing products at the same time.

 

Who Should Use Benylin 4 Flu Tablets?

 

These tablets are suitable for adults and young people aged 12 and over who are experiencing multi-symptom cold or flu. They are particularly useful if you are dealing with a combination of fever, congestion, runny nose, and general aches rather than just one isolated symptom. If your symptoms are mild or limited to a single complaint, a simpler single-ingredient product may be more appropriate.

Benylin 4 Flu tablets are well suited for:

  • Adults aged 18 and over with typical flu symptoms
  • Adolescents aged 12–17 (under adult supervision)
  • People who prefer a tablet format over liquids or hot drinks
  • Those who want to manage daytime symptoms while remaining as alert as possible (though drowsiness is still possible)

 

How Do Benylin 4 Flu Tablets Compare to Similar Products?

 

Feature Benylin 4 Flu Tablets Lemsip Max Capsules
Active ingredients Paracetamol, pseudoephedrine, diphenhydramine Paracetamol, phenylephrine
Antihistamine included Yes (diphenhydramine) No
Drowsiness risk Yes — diphenhydramine is sedating Lower — no antihistamine
Format Tablet (swallowed) Capsule (swallowed)

 

How Should You Store Benylin 4 Flu Tablets?

 

Store your Benylin 4 Flu tablets below 25°C in a dry place, away from direct sunlight and moisture. Keep them in the original packaging so you can always check the expiry date and batch number. As with all medicines, store them out of the sight and reach of children.

Do not use the tablets after the expiry date printed on the pack. If you are unsure whether a medicine is still safe to use, your local pharmacist can advise you. If you need additional support during illness, our vitamins and supplements range includes products that may help support your immune system during recovery.

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 4 Flu 24 Tablets specifications
Treatment category Cold and flu relief
Mechanism of action Analgesic/antipyretic (paracetamol), sympathomimetic decongestant (pseudoephedrine), antihistamine (diphenhydramine)
Effective for Fever, headache, nasal congestion, runny nose, body aches associated with cold and flu
Suitable for Adults and children aged 12 and over
Active ingredients Paracetamol 500 mg, Pseudoephedrine hydrochloride 30 mg, Diphenhydramine hydrochloride 12.5 mg
Pack size 24 tablets
UK classification Pharmacy (P) medicine
Drug class Combination analgesic, decongestant, and antihistamine
Preparation Film-coated tablet
Route of administration Oral

Specifications of Benylin 4 Flu 24 Tablets

 

What Is Benylin 4 Flu and What Is It Used For?

 

Benylin 4 Flu 24 Tablets is a combination over-the-counter medicine used to relieve the symptoms of cold and flu in adults and children aged 12 and over. It contains three active ingredients — paracetamol, pseudoephedrine hydrochloride, and diphenhydramine hydrochloride — which work together to reduce fever, ease aches and headaches, clear nasal congestion, and calm a runny nose or sneezing. The NHS advises that most people with flu can manage their symptoms at home using medicines like paracetamol or ibuprofen, rest, and adequate fluid intake.

 

What Do You Need to Know Before Using Benylin 4 Flu?

 

Before taking these tablets, read the following carefully. Some people should not use this product at all, and others may need to take extra care.

Do not take Benylin 4 Flu tablets if you:

  • Are allergic to paracetamol, pseudoephedrine, diphenhydramine, or any other ingredient in the tablet
  • Are taking or have taken monoamine oxidase inhibitors (MAOIs) within the last 14 days
  • Have severe high blood pressure (hypertension) or severe coronary artery disease
  • Are taking other medicines containing paracetamol
  • Are pregnant or breastfeeding without first consulting a doctor
  • Are under 12 years of age

Speak to your pharmacist or doctor before use if you have:

  • Liver or kidney problems
  • Diabetes, thyroid disease, or glaucoma
  • An enlarged prostate or difficulty urinating
  • Heart disease or a history of stroke

Known drug interactions — do not take with:

  • Other decongestants or sympathomimetic medicines
  • Tricyclic antidepressants or other CNS depressants
  • Sedatives, sleeping tablets, or anxiolytics
  • Warfarin or other anticoagulants (paracetamol may affect INR at higher doses)
  • Beta-blockers or antihypertensive medicines

 

How Should You Use Benylin 4 Flu Tablets?

 

Always take Benylin 4 Flu tablets exactly as directed on the label or as advised by your pharmacist. Swallow the tablets whole with a glass of water. Do not crush or chew them.

  1. Check you are not already taking any other paracetamol-containing product.
  2. Take two tablets with a full glass of water.
  3. Allow at least four hours between doses.
  4. Do not take more than four doses (eight tablets) in any 24-hour period.
  5. Do not take for more than five consecutive days without speaking to a doctor.
Age Group Dose Frequency Maximum daily dose
Adults and children aged 12+ 2 tablets Every 4–6 hours 8 tablets (4 doses)
Children under 12 Not suitable — do not use

 

What Are the Possible Side Effects of Benylin 4 Flu?

 

Like all medicines, Benylin 4 Flu tablets can cause side effects, although not everyone experiences them. If you are concerned about any side effect, stop taking the tablets and speak to your pharmacist or GP. You can also find additional support through our pain relief range if you need an alternative approach.

Common side effects:

  • Drowsiness or sedation (due to diphenhydramine)
  • Dry mouth, nose, or throat
  • Dizziness or difficulty concentrating
  • Nausea

Less common side effects:

  • Increased heart rate (palpitations)
  • Difficulty sleeping (paradoxical stimulation, more common in children — though this product is not for under-12s)
  • Urinary retention, particularly in men with prostate issues
  • Raised blood pressure
  • Skin rash or allergic reaction

Serious allergic reactions (anaphylaxis) are rare but require immediate medical attention. Signs include swelling of the face, lips, or throat, difficulty breathing, or a severe skin rash. Call 999 if you experience these symptoms.

 

How Should You Store Benylin 4 Flu Tablets?

 

Correct storage helps maintain the safety and effectiveness of your tablets. If you are also managing other health concerns during winter, our ear, nose and throat range may offer complementary products.

  • Store below 25°C in a dry place away from direct heat and sunlight
  • Keep in the original blister packaging until use
  • Do not store in a bathroom or near a sink where moisture can accumulate
  • Keep out of the sight and reach 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 tablets to your pharmacy

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 4 Flu tablets online in the UK?

You can buy Benylin 4 Flu 24 tablets directly from Cured Pharmacy, a GPhC-registered online pharmacy in the UK. No prescription is needed as it is an over-the-counter medicine. Simply add it to your basket and it will be dispatched to your door.

How do Benylin 4 Flu tablets work in the body?

The tablets contain three active ingredients that each target a different symptom. Paracetamol reduces fever and relieves pain, pseudoephedrine shrinks swollen nasal blood vessels to ease congestion, and diphenhydramine blocks histamine receptors to reduce a runny nose and sneezing. Together they provide multi-symptom relief from a single dose.

What is the correct dose of Benylin 4 Flu tablets for adults?

Adults and young people aged 12 and over should take two tablets every four to six hours as needed. You must not exceed eight tablets (four doses) in any 24-hour period. Always leave at least four hours between doses.

How long can I take Benylin 4 Flu tablets for?

You should not take Benylin 4 Flu tablets for more than five consecutive days without consulting a doctor or pharmacist. If your symptoms persist or worsen after five days, seek medical advice. Prolonged use without review is not recommended.

Can Benylin 4 Flu tablets cause drowsiness?

Yes, diphenhydramine — one of the active ingredients — is a sedating antihistamine and can cause drowsiness. You should avoid driving, operating heavy machinery, or drinking alcohol while taking these tablets. If drowsiness is a concern, speak to your pharmacist about a non-sedating alternative.

Can I take Benylin 4 Flu tablets if I am pregnant or breastfeeding?

You should not take Benylin 4 Flu tablets during pregnancy or while breastfeeding without first speaking to your doctor or pharmacist. Pseudoephedrine and diphenhydramine may not be safe during these periods. Your healthcare provider can suggest a safer alternative.

Are Benylin 4 Flu tablets suitable for children?

Benylin 4 Flu tablets are not suitable for children under 12 years of age. For younger children, speak to your pharmacist or GP about age-appropriate cold and flu remedies. You can also browse our baby and toddler range for suitable products.

Can I take Benylin 4 Flu tablets with other medicines?

Do not take Benylin 4 Flu tablets alongside other paracetamol-containing products, MAOIs, other decongestants, sedatives, or antidepressants. Always tell your pharmacist about every medicine you are currently taking before starting a new one. Interactions can be serious and are not always obvious.

What happens if I accidentally take too many Benylin 4 Flu tablets?

If you take more than the recommended dose, seek medical attention immediately — even if you feel well — because paracetamol overdose can cause serious liver damage that may not be immediately apparent. Go to your nearest A&E or call 999. Take the packaging with you so medical staff can see exactly what you have taken.

What should I do if I miss a dose of Benylin 4 Flu tablets?

If you miss a dose, simply take the next dose when needed, ensuring at least four hours have passed since your last dose. Do not double up to make up for a missed dose. These tablets are taken as needed for symptom relief rather than on a strict schedule.

What are the alternatives to Benylin 4 Flu tablets?

Common alternatives include Lemsip Max capsules, Day Nurse capsules, and Night Nurse liquid, all of which contain different combinations of active ingredients. The right choice depends on your specific symptoms and whether you need a daytime or night-time formula. Browse our full cold and flu range to compare options.

Can I drink alcohol while taking Benylin 4 Flu tablets?

You should avoid alcohol while taking Benylin 4 Flu tablets. Alcohol can increase the sedating effects of diphenhydramine and may also increase the risk of liver damage when combined with paracetamol. It is safest to abstain entirely until you have finished the course.

Can I take Benylin 4 Flu tablets if I have high blood pressure?

Pseudoephedrine can raise blood pressure, so Benylin 4 Flu tablets are generally not recommended if you have high blood pressure or cardiovascular disease. Speak to your GP or pharmacist before taking them if you have any heart or blood pressure condition. They can suggest a decongestant-free alternative.

How quickly do Benylin 4 Flu tablets start to work?

Paracetamol typically begins to take effect within 30 to 60 minutes of taking a dose. Pseudoephedrine and diphenhydramine also act within a similar timeframe. The full effect on congestion and runny nose may take slightly longer to become noticeable.

What is the latest guidance on managing flu symptoms at home?

The NHS recommends rest, staying hydrated, and using over-the-counter medicines such as paracetamol or ibuprofen to manage fever and aches. Combination products like Benylin 4 Flu tablets can help when multiple symptoms are present. Most people recover from flu within a week, but you should seek medical advice if symptoms are severe or you are in a high-risk group.

How Should You Use Benylin 4 Flu Tablets?

Taking Benylin 4 Flu tablets correctly is straightforward, but it is worth following each step carefully — particularly because the tablets contain paracetamol, which requires you to check you are not already taking it in another product. Swallow the tablets whole with a full glass of water. Do not crush, chew, or break them.

Follow these steps each time you take a dose:

What Is the Correct Dose of Benylin 4 Flu Tablets?

The recommended dose for adults and children aged 12 and over is two tablets, taken up to four times daily. Never exceed eight tablets in 24 hours. The table below summarises dosing by age group.

When Is the Best Time to Use Benylin 4 Flu Tablets?

Take Benylin 4 Flu tablets when your symptoms are at their most disruptive — typically in the morning when fever and congestion tend to peak, or before activities where you need to feel more comfortable. Because diphenhydramine can cause drowsiness, some people find these tablets more suitable in the evening or when they do not need to drive or concentrate heavily.

If you need daytime relief without sedation, speak to your pharmacist about whether a non-antihistamine alternative might suit you better during working hours.

How Long Can You Use Benylin 4 Flu Tablets For?

Do not take Benylin 4 Flu tablets for more than five consecutive days without seeking medical advice. Flu symptoms typically begin to improve within a week, but if your fever remains high, your symptoms worsen, or you develop new symptoms such as chest pain or difficulty breathing, contact your GP or call NHS 111.

Prolonged use of decongestants like pseudoephedrine is not recommended, and extended use of paracetamol beyond the stated duration should always be discussed with 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 Benylin 4 Flu Tablets?

Most people tolerate Benylin 4 Flu tablets well, but some do experience side effects — particularly those related to diphenhydramine, the antihistamine component. These are generally mild and tend to resolve once you stop taking the tablets.

  • Drowsiness or sedation
  • Dry mouth, nose, or throat
  • Dizziness or light-headedness
  • Nausea or stomach discomfort
  • Difficulty concentrating

What Are the Less Common Side Effects of Benylin 4 Flu Tablets?

Less frequently, some people may notice side effects linked to the pseudoephedrine (decongestant) component. These are more likely if you are sensitive to stimulant-type medicines or have an underlying cardiovascular condition.

  • Increased heart rate or palpitations
  • Raised blood pressure
  • Difficulty sleeping or restlessness
  • Urinary retention (particularly in men with prostate problems)
  • Headache
  • Skin rash or itching

What Are the Serious Side Effects of Benylin 4 Flu Tablets?

Serious side effects are rare but require immediate medical attention. Paracetamol overdose — even accidental — can cause severe liver damage that may not produce obvious symptoms for several days. If you think you have taken too much, go to A&E immediately, even if you feel well.

Signs of a serious allergic reaction (anaphylaxis) include swelling of the face, lips, tongue, or throat, difficulty breathing, a rapid heartbeat, or a widespread skin rash. Call 999 immediately if you experience any of these.

What Should You Do If You Experience Side Effects?

If you experience mild side effects such as drowsiness or dry mouth, these often improve as your body adjusts. Avoid alcohol, driving, and operating machinery if you feel drowsy. If side effects are troublesome or persistent, stop taking the tablets and speak to your pharmacist or GP. They can advise whether a different product would be more suitable for your symptoms.

Can Benylin 4 Flu Tablets Interact With Other Medicines?

Yes — interactions are an important consideration with this product. Pseudoephedrine can interact with MAOIs, beta-blockers, and other sympathomimetic medicines. Diphenhydramine can enhance the sedative effects of alcohol, sleeping tablets, and anxiolytics. Paracetamol may affect the anticoagulant effect of warfarin at higher doses. Always tell your pharmacist about every medicine, supplement, or herbal remedy you are taking before starting Benylin 4 Flu tablets.

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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