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Benylin Mucus Cough Night - 150ml

Benylin Mucus Cough Night - 150ml

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  • ✔️ Relieves chesty mucus coughs to help you sleep
  • ✔️ Contains diphenhydramine to suppress the cough reflex overnight
  • ✔️ Levomenthol soothes and cools irritated throat airways
  • ✔️ Dual-action formula targets both coughing and sleeplessness
  • ✔️ Suitable for adults and young people aged 12 and over

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What Is Benylin Mucus Cough Night and How Does It Help?

 

A chesty cough that keeps you awake at night is exhausting — and frustrating. Benylin Mucus Cough Night is an over-the-counter oral liquid designed specifically for evening use, targeting mucus-producing coughs while also helping you drift off to sleep. Each 150ml bottle contains a dual-action formula that works on both the cough itself and the sleeplessness that so often comes with it. If you've been lying awake coughing for hours, this could be exactly what you need. You can find it alongside other cold and flu remedies at Cured Pharmacy.

This product is classified as a General Sale List (GSL) medicine in the UK, meaning it's available without a prescription. It's manufactured by Benylin, a well-established brand in the UK cough and cold market. At £7.69 for 150ml, it represents a straightforward, accessible option for adults dealing with a productive nighttime cough.

 

How Does Benylin Mucus Cough Night Work in the Body?

 

The formula relies on two active ingredients working together. Understanding what each one does helps you use the product with confidence.

  • Diphenhydramine hydrochloride (14mg per 5ml): This is a first-generation antihistamine. It works centrally by suppressing the cough reflex in the brain, reducing the urge to cough. It also crosses the blood-brain barrier, producing a sedative effect that helps you fall asleep more easily.
  • Levomenthol (1.1mg per 5ml): A naturally derived compound from peppermint oil. It creates a cooling sensation in the throat and upper airways, which can ease the discomfort associated with a chesty cough and make breathing feel more comfortable.

Together, these ingredients address two of the most disruptive aspects of a nighttime mucus cough — the cough itself and the inability to sleep through it.

 

Who Is Benylin Mucus Cough Night Suitable For?

 

This product is intended for adults and adolescents aged 12 and over who are experiencing a chesty, mucus-producing cough that is disrupting their sleep. It's particularly useful during cold and flu season, or when a lingering respiratory infection is keeping you up at night.

  • Adults aged 18 and over with a productive nighttime cough
  • Adolescents aged 12–17 (under adult supervision)
  • People who need both cough relief and sleep support in one dose
  • Those who prefer a liquid formulation over tablets

It is not suitable for children under 12, pregnant or breastfeeding women (without medical advice), or anyone with certain underlying health conditions — see the patient information section below for full details.

 

How Does Benylin Mucus Cough Night Compare to Benylin Mucus Cough Day?

 

Feature Benylin Mucus Cough Night Benylin Mucus Cough Day
Active ingredient Diphenhydramine HCl + Levomenthol Guaifenesin + Levomenthol
Sedating effect Yes — helps sleep No — non-drowsy
Best time to take At bedtime only During the day
Suitable for driving No Yes

 

How Should You Store Benylin Mucus Cough Night?

 

Store your bottle of Benylin Mucus Cough Night below 25°C, away from direct sunlight and heat sources. Keep it out of reach and sight of children at all times. Do not use the product after the expiry date printed on the label — even if the liquid looks and smells fine. Once opened, check the packaging for any in-use shelf-life guidance.

If you're managing multiple symptoms this winter — such as a sore throat alongside your cough — it's worth browsing the ear, nose and throat range at Cured Pharmacy for complementary products. Always check with your pharmacist before combining medicines.

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 Night 150ml specifications
Treatment category Cough remedies
Mechanism of action Antihistamine cough suppressant + throat-soothing menthol
Effective for Chesty mucus coughs at night; sleep disruption due to coughing
Suitable for Adults and children aged 12 and over
Active ingredients Diphenhydramine hydrochloride 14mg/5ml; Levomenthol 1.1mg/5ml
Pack size 150ml
UK classification General Sale List (GSL)
Drug class First-generation antihistamine / cough suppressant
Preparation Oral liquid (syrup)
Route of administration Oral

Specifications of Benylin Mucus Cough Night 150ml

 

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

 

Benylin Mucus Cough Night is an oral liquid medicine used to relieve chesty, mucus-producing coughs in adults and young people aged 12 and over. It is specifically formulated for use at bedtime, combining a cough suppressant with a sedating antihistamine to help you get a full night's rest when a persistent cough would otherwise keep you awake. It is available over the counter without a prescription from UK pharmacies.

 

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

 

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

Do not take Benylin Mucus Cough Night if you:

  • Are under 12 years of age
  • Are allergic to diphenhydramine, levomenthol, or any other ingredient in the product
  • Are taking or have taken monoamine oxidase inhibitors (MAOIs) within the last 14 days
  • Have a dry, tickly, or non-productive cough
  • Are pregnant or breastfeeding without first speaking to a doctor or pharmacist
  • Have severe liver or kidney disease
  • Have glaucoma, urinary retention, or an enlarged prostate

Speak to your pharmacist or GP before use if you:

  • Have asthma, chronic bronchitis, or COPD
  • Have epilepsy or a history of seizures
  • Have difficulty passing urine
  • Are taking other medicines that cause drowsiness

Known drug interactions — do not take alongside:

  • MAOIs (e.g. phenelzine, tranylcypromine)
  • Other antihistamines
  • Sedatives, sleeping tablets, or anxiolytics
  • Alcohol (increases sedative effect significantly)
  • Tricyclic antidepressants

 

How Should You Use Benylin Mucus Cough Night Correctly?

 

Always use this medicine exactly as described on the label or as directed by your pharmacist. This product is for bedtime use only — do not take it during the day as it will cause drowsiness.

  1. Shake the bottle gently before use.
  2. Measure the correct dose using the measuring cup or spoon provided.
  3. Take the dose approximately 30 minutes before going to bed.
  4. Do not take more than one dose in any 24-hour period.
  5. Do not drive, cycle, or operate machinery after taking this medicine.
Age Group Dose Frequency
Adults and children aged 12+ 10ml (two 5ml spoonfuls) Once at bedtime only
Children under 12 Not suitable

 

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

 

Like all medicines, Benylin Mucus Cough Night can cause side effects, although not everyone experiences them. The drowsiness caused by diphenhydramine is an expected and intentional effect at night, but it can persist into the following morning in some people.

Common side effects:

  • Drowsiness (expected — do not drive the next morning if still affected)
  • Dry mouth
  • Dizziness or light-headedness
  • Headache

Less common side effects:

  • Blurred vision
  • Difficulty passing urine (urinary retention)
  • Constipation
  • Nausea or stomach upset
  • Paradoxical excitability (particularly in older adults or children — though this product is not for under-12s)

Stop taking the medicine and seek medical advice if you experience a severe allergic reaction (rash, swelling of the face or throat, difficulty breathing). If you're also managing pain alongside your cough, you may find our pain relief range helpful — but always check for interactions with your pharmacist first.

 

How Should You Store Benylin Mucus Cough Night Safely?

 

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

If you're looking for additional support during cold and flu season, our vitamins and supplements range includes immune-support options that may complement your recovery. Always speak to your pharmacist if you're unsure about combining products.

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 Night online in the UK?

You can buy Benylin Mucus Cough Night 150ml directly from Cured Pharmacy, a GPhC-registered UK online pharmacy, for £7.69. It's available without a prescription as an over-the-counter medicine. You can also find it in most UK high street pharmacies and supermarkets.

How does Benylin Mucus Cough Night work in the body?

It contains diphenhydramine hydrochloride, a first-generation antihistamine that suppresses the cough reflex centrally in the brain and induces drowsiness to help you sleep. Levomenthol provides a cooling, soothing sensation in the throat and airways. Together, they target both the cough and the sleep disruption it causes.

How do I use Benylin Mucus Cough Night step by step?

Shake the bottle, then measure 10ml using the measuring cup provided. Take it approximately 30 minutes before going to bed. Only take one dose in any 24-hour period, and do not drive or operate machinery after taking it.

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

The recommended dose for adults and young people aged 12 and over is 10ml (two 5ml spoonfuls) taken once at bedtime. Do not exceed this dose. This product should only be taken once in a 24-hour period.

When is the best time to take Benylin Mucus Cough Night?

This medicine is specifically designed for bedtime use only. Taking it approximately 30 minutes before you plan to sleep gives the diphenhydramine time to take effect. Never take it during the day, as it will cause significant drowsiness that affects your ability to drive or function safely.

What are the side effects of Benylin Mucus Cough Night?

Common side effects include drowsiness (which is expected and intentional at night), dry mouth, dizziness, and headache. Less commonly, you may experience blurred vision, difficulty urinating, or nausea. If you experience a severe allergic reaction — such as facial swelling or difficulty breathing — stop taking it and seek urgent medical help.

How do I manage the drowsiness caused by Benylin Mucus Cough Night?

The drowsiness is an intended effect at night, but it can persist into the next morning in some people. Do not drive, cycle, or operate machinery until you are sure the sedative effect has fully worn off. Avoid alcohol entirely while taking this medicine, as it significantly increases drowsiness.

Who is eligible to take Benylin Mucus Cough Night?

This product is suitable for adults and young people aged 12 and over who have a chesty, mucus-producing cough that is disrupting their sleep. It is not suitable for children under 12, and those with certain conditions — such as glaucoma, urinary retention, or severe liver disease — should not use it. Always check with your pharmacist if you're unsure.

Is Benylin Mucus Cough Night safe during pregnancy or breastfeeding?

You should not take this medicine during pregnancy or while breastfeeding without first speaking to your doctor or pharmacist. Diphenhydramine can pass into breast milk and may not be safe for your baby. Your healthcare provider can advise on safer alternatives if needed.

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

Since this medicine is taken just once at bedtime, if you forget to take it one night, simply skip that dose and take it the following night if needed. Never take a double dose to make up for a missed one. This product is for short-term use only.

Can I take Benylin Mucus Cough Night with other medicines?

You should not take this product alongside MAOIs, other antihistamines, sedatives, sleeping tablets, tricyclic antidepressants, or alcohol, as these combinations can increase the risk of serious side effects. Always tell your pharmacist about all medicines you are currently taking before starting this product. You can browse our cold and flu range for compatible products.

How long can you use Benylin Mucus Cough Night for?

Do not use this product for more than 7 consecutive nights without seeking medical advice. If your cough persists beyond one week, worsens, or is accompanied by a high fever, chest pain, or blood in your sputum, see your GP. Prolonged coughs can sometimes indicate an underlying condition that needs investigation.

What are the alternatives to Benylin Mucus Cough Night?

Alternatives include Benylin Mucus Cough Day (non-drowsy, contains guaifenesin), other diphenhydramine-based night cough products, or simple honey and lemon remedies recommended by the NHS for mild coughs. If your cough is dry rather than chesty, a different formulation would be more appropriate — speak to your pharmacist for guidance.

Is Benylin Mucus Cough Night suitable for people with asthma?

People with asthma, chronic bronchitis, or COPD should speak to their GP or pharmacist before using this product. Cough suppressants are generally not recommended for people with these conditions, as suppressing the cough reflex can sometimes be counterproductive or mask worsening symptoms.

What are the latest recommendations on treating mucus coughs at night?

The NHS advises that most coughs caused by colds or minor respiratory infections will resolve on their own within three weeks. For nighttime relief, products containing diphenhydramine — such as Benylin Mucus Cough Night — are widely used in the UK. Staying hydrated, using a humidifier, and sleeping with your head slightly elevated can also help reduce nighttime coughing. You may also find support products in our ear, nose and throat range.

How Should You Use Benylin Mucus Cough Night?

This medicine is for oral use only and should be taken at bedtime. Always read the label carefully before use, and use the measuring cup or spoon provided to ensure an accurate dose. Never estimate the amount by eye.

If you accidentally take too much, contact NHS 111 or go to your nearest A&E immediately. Always keep the bottle out of reach of children.

What Is the Correct Dose of Benylin Mucus Cough Night?

The dose depends on age. This product is not suitable for children under 12 years old under any circumstances. Do not give this medicine to a child under 12 even if the cough seems severe.

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

As the name suggests, this product is designed exclusively for nighttime use. Take it approximately 30 minutes before you plan to go to sleep to allow the diphenhydramine to begin working. Taking it any earlier in the evening risks causing drowsiness while you are still active, which could be dangerous — particularly if you need to drive or care for others.

Never take this medicine in the morning or during the day. If you need daytime cough relief, speak to your pharmacist about a non-drowsy alternative such as a guaifenesin-based product.

How Long Can You Use Benylin Mucus Cough Night For?

This product is intended for short-term use only. Do not take it for more than 7 consecutive nights without seeking advice from your doctor or pharmacist. Most coughs caused by colds or minor respiratory infections will begin to improve within this timeframe.

If your cough persists beyond one week, worsens significantly, or is accompanied by symptoms such as a high fever, chest pain, shortness of breath, or blood in your sputum, stop using this product and see your GP promptly. These symptoms may indicate a more serious underlying condition that requires medical assessment.

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

Customer Reviews

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Anonymous

It does what it says! It helps to clear mucus in the evening, giving a better chance of a good night's sleep.

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

Because this product contains diphenhydramine hydrochloride — a sedating antihistamine — drowsiness is both an expected and intentional effect when taken at bedtime. However, this sedation can sometimes persist into the following morning, which is important to be aware of before driving or going to work.

  • Drowsiness or excessive sleepiness (including next-morning grogginess)
  • Dry mouth
  • Dizziness or light-headedness
  • Headache

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

Some people experience side effects that are less frequent but still worth knowing about. These tend to be related to the anticholinergic properties of diphenhydramine, which can affect various body systems.

  • Blurred vision
  • Difficulty passing urine (urinary retention) — particularly in men with an enlarged prostate
  • Constipation
  • Nausea or stomach discomfort
  • Palpitations or a faster heartbeat
  • Paradoxical excitability or restlessness (more common in older adults)

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

Serious side effects are rare but require immediate medical attention. Stop taking this medicine straight away and seek urgent help if you notice any of the following.

  • Signs of a severe allergic reaction: skin rash, itching, swelling of the face, lips, tongue, or throat
  • Difficulty breathing or swallowing
  • Severe dizziness or loss of consciousness
  • Seizures

If you suspect an overdose — for example, if a child has accidentally swallowed the medicine — call 999 or go to A&E immediately. Do not wait for symptoms to appear.

What Should You Do If You Experience Side Effects?

If you experience mild side effects such as dry mouth or a slight headache, these will usually resolve on their own once the medicine wears off. Staying well hydrated can help with dry mouth. If drowsiness persists well into the following day, do not drive and consider whether this product is suitable for you long-term.

For any side effect that concerns you, or that does not improve, contact your pharmacist or GP. You can also report side effects directly to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk.

Can Benylin Mucus Cough Night Interact With Other Medicines?

Yes — this product has several clinically significant interactions. Diphenhydramine interacts with a range of medicines, and combining them can increase the risk of serious adverse effects. The most important interactions include MAOIs (do not use within 14 days of stopping an MAOI), other antihistamines, sedatives, sleeping tablets, tricyclic antidepressants, and alcohol. Even some over-the-counter cold and flu products contain antihistamines, so always check the ingredients of any other medicine you are taking. Speak to your pharmacist before combining this product with anything else.

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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