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Sudafed Mucus Relief Day & Night – 16 Capsules

Sudafed Mucus Relief Day & Night – 16 Capsules

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  • ✔️ Relieves nasal congestion with pseudoephedrine decongestant
  • ✔️ Thins and loosens mucus with guaifenesin expectorant
  • ✔️ Night capsule supports sleep during cold symptoms
  • ✔️ Separate day and night formulas for 24-hour relief
  • ✔️ Suitable for adults and children aged 12 and over

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What Is Sudafed Mucus Relief Day Night?

 

Blocked nose, thick mucus, and that relentless heavy-headed feeling — a cold can make even the simplest day feel like a real effort. Sudafed Mucus Relief Day Night is a dual-action, over-the-counter cold remedy designed to tackle congestion and mucus around the clock, with separate capsule formulations for daytime and night-time use. The pack contains 16 capsules in total — 12 day capsules and 4 night capsules — giving you a structured course of relief across several days. You can browse the full range of cold and flu remedies at Cured Pharmacy if you need additional support alongside this product.

Cold symptoms are incredibly common. The NHS notes that most adults experience two to four colds per year, and symptoms typically include a runny or blocked nose, sore throat, and general fatigue. Having a product that addresses both daytime functioning and night-time rest in one pack is genuinely useful — particularly when disrupted sleep makes recovery slower.

 

How Does Sudafed Mucus Relief Day & Night Work?

 

The day and night capsules each contain a different combination of active ingredients, which is what makes this product work across a full 24-hour period. Here is how each formulation acts:

  • Day capsules contain pseudoephedrine hydrochloride (60 mg) and guaifenesin (200 mg). Pseudoephedrine is a sympathomimetic decongestant — it causes vasoconstriction in the nasal mucosa, reducing swelling and opening the nasal passages. Guaifenesin is an expectorant that thins and loosens mucus, making it easier to clear.
  • Night capsules contain pseudoephedrine hydrochloride (60 mg) and diphenhydramine hydrochloride (25 mg). Diphenhydramine is a first-generation antihistamine with sedative properties, helping you sleep despite congestion, while pseudoephedrine continues to reduce nasal swelling.
  • Together, the two formulations address the full symptom picture of a cold — congestion, mucus, and disrupted sleep — without relying on a single ingredient to do everything.

 

Who Should Use Sudafed Mucus Relief Day & Night?

 

This product is intended for adults and young people aged 12 and over who are experiencing cold symptoms including nasal congestion and excess mucus. It is particularly suited to those who find that cold symptoms disrupt their sleep, since the night capsule's sedative component addresses that specific problem. That said, it is not appropriate for everyone.

Sudafed Mucus Relief Day Night is suitable for:

  • Adults and adolescents aged 12 years and over
  • People with nasal congestion and mucus caused by the common cold
  • Those whose cold symptoms are affecting sleep quality
  • Individuals who need to remain alert and functional during the day

 

How Does Sudafed Mucus Relief Day & Night Compare to Similar Products?

 

Feature Sudafed Mucus Relief Day & Night Benylin Day & Night Cold Tablets
Daytime decongestant Pseudoephedrine HCl 60 mg Paracetamol 500 mg + Phenylephrine 6.1 mg
Night-time sedative Diphenhydramine HCl 25 mg Diphenhydramine HCl 25 mg
Expectorant (mucus relief) Guaifenesin 200 mg (day capsules) Not included
Analgesic/antipyretic Not included Paracetamol 500 mg (day tablets)

 

Is Sudafed Mucus Relief Day & Night Suitable for Everyone?

 

Not quite. Because the day capsules contain pseudoephedrine — a decongestant that raises blood pressure — this product is not suitable for people with hypertension, cardiovascular disease, hyperthyroidism, or glaucoma. It should also be avoided by anyone currently taking monoamine oxidase inhibitors (MAOIs) or within 14 days of stopping them, as the combination can cause a dangerous rise in blood pressure. Pregnant and breastfeeding women should not use this product without first speaking to their GP or midwife. If you are managing other conditions alongside a cold, our ear, nose and throat range may include alternatives worth considering.

Store below 25°C, in a dry place, and keep out of the reach and sight of children. Check the expiry date before use and do not use the product beyond it.

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.

Sudafed Mucus Relief Day & Night – 16 Capsules specifications
Treatment category Cold and flu, nasal congestion, mucus relief
Mechanism of action Sympathomimetic decongestant (pseudoephedrine), expectorant (guaifenesin), sedating antihistamine (diphenhydramine)
Effective for Nasal congestion, excess mucus, cold-related sleep disruption
Suitable for Adults and children aged 12 and over
Active ingredients Day: Pseudoephedrine HCl 60 mg, Guaifenesin 200 mg; Night: Pseudoephedrine HCl 60 mg, Diphenhydramine HCl 25 mg
Pack size 16 capsules (12 day + 4 night)
UK classification Pharmacy (P) medicine
Drug class Decongestant / Expectorant / Antihistamine combination
Preparation Hard capsules
Route of administration Oral

Specifications of Sudafed Mucus Relief Day & Night – 16 Capsules

 

What Is Sudafed Mucus Relief Day & Night and What Is It Used For?

 

Sudafed Mucus Relief Day & Night is an over-the-counter combination cold remedy available as hard capsules. It is used to relieve the symptoms of the common cold, including nasal congestion, blocked sinuses, and the build-up of thick mucus in the airways. The dual-pack format — with separate day and night capsules — means you get targeted relief during waking hours without the sedation that would impair your daily activities, and then a sleep-supporting formulation at bedtime. The NHS describes the common cold as a viral upper respiratory tract infection, and while there is no cure, symptom relief medicines like this one can make the experience considerably more manageable.

 

What Do You Need to Know Before Using Sudafed Mucus Relief Day & Night?

 

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

Do not take this product if you:

  • Are allergic to pseudoephedrine, guaifenesin, diphenhydramine, or any other ingredient in the capsules
  • Are taking or have taken MAOIs within the last 14 days
  • Have severe high blood pressure or severe coronary artery disease
  • Have an overactive thyroid (hyperthyroidism)
  • Have closed-angle glaucoma
  • Are pregnant or breastfeeding
  • Are under 12 years of age

Speak to your pharmacist or GP before use if you:

  • Have mild to moderate high blood pressure
  • Have diabetes, heart disease, or kidney problems
  • Have an enlarged prostate or difficulty urinating
  • Have a history of epilepsy

Known drug interactions — avoid taking alongside:

  • Other decongestants or sympathomimetic medicines
  • Tricyclic antidepressants
  • Beta-blockers
  • Other sedating antihistamines or CNS depressants (including alcohol)
  • Digoxin or cardiac glycosides

 

How Should You Use Sudafed Mucus Relief Day & Night?

 

Always follow the dosage instructions on the pack or as directed by your pharmacist. Do not exceed the stated dose. Swallow capsules whole with a glass of water — do not chew or crush them.

  1. Take one day capsule in the morning with water.
  2. Take a further day capsule every 4 to 6 hours as needed during the day.
  3. Do not take more than three day capsules in any 24-hour period.
  4. Take one night capsule at bedtime only — do not take it during the day.
  5. Do not drive or operate machinery after taking the night capsule, as diphenhydramine causes drowsiness.
  6. Do not take with alcohol.
Capsule type Age group Dose Frequency
Day capsule Adults & children 12+ 1 capsule Every 4–6 hours, max 3 per day
Night capsule Adults & children 12+ 1 capsule Once at bedtime only
Day or night capsule Under 12 years Not suitable — do not use

 

What Are the Possible Side Effects of Sudafed Mucus Relief Day & Night?

 

Like all medicines, this product can cause side effects, although not everyone experiences them. If you are also managing other symptoms such as aches and pains, you may find our pain relief range helpful alongside your cold treatment.

Common side effects:

  • Drowsiness (particularly from the night capsules)
  • Dry mouth, nose, or throat
  • Nausea or stomach upset
  • Headache
  • Difficulty sleeping (from the day capsules, due to pseudoephedrine)

Less common side effects:

  • Increased heart rate (palpitations)
  • Raised blood pressure
  • Urinary retention (particularly in men with prostate issues)
  • Skin rash or itching
  • Dizziness or restlessness

Stop taking this product and seek immediate medical attention if you experience chest pain, difficulty breathing, severe skin reactions, or a significant rise in blood pressure.

 

How Should You Store Sudafed Mucus Relief Day & Night?

 

Correct storage helps maintain the product's safety and effectiveness throughout its shelf life. If you are looking for other health essentials to keep at home, our first aid collection is a good place to start.

  • Store below 25°C in a cool, dry place
  • Keep away from direct sunlight and moisture
  • Keep out of the reach and sight of children
  • Do not use after the expiry date printed on the pack
  • Do not store in a bathroom or near a sink where humidity is high
  • Return unused or expired medicines to your local pharmacy for safe disposal — do not put them in household waste or flush them down the toilet

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 Sudafed Mucus Relief Day & Night online in the UK?

You can buy Sudafed Mucus Relief Day & Night 16 Capsules from Cured Pharmacy, a GPhC-registered UK online pharmacy, for just £4.69. It is available without a prescription and dispatched quickly to your door. You can also find it in most high street pharmacies and supermarkets across the UK.

How does Sudafed Mucus Relief Day & Night work in the body?

The day capsules use pseudoephedrine to constrict blood vessels in the nasal lining, reducing swelling and opening the airways, while guaifenesin thins mucus so it is easier to clear. The night capsules swap guaifenesin for diphenhydramine, a sedating antihistamine that helps you sleep while pseudoephedrine continues to relieve congestion. Together, the two formulations provide round-the-clock symptom management during a cold.

How do I use Sudafed Mucus Relief Day & Night step by step?

Take one day capsule in the morning, then one more every 4 to 6 hours as needed — up to a maximum of three day capsules in 24 hours. At bedtime, take one night capsule only. Swallow each capsule whole with a full glass of water and avoid alcohol throughout the course.

What is the correct dose of Sudafed Mucus Relief Day & Night for adults?

Adults and young people aged 12 and over should take one day capsule up to three times daily, spaced at least 4 hours apart. One night capsule should be taken at bedtime. Never exceed three day capsules and one night capsule in any 24-hour period.

What is the best time to take Sudafed Mucus Relief Day & Night?

Take the first day capsule in the morning when symptoms begin, then repeat every 4 to 6 hours as needed throughout the day. The night capsule should be taken immediately before bed — not earlier in the evening — as diphenhydramine causes drowsiness and you should not drive or operate machinery after taking it.

What are the side effects of Sudafed Mucus Relief Day & Night?

Common side effects include drowsiness (especially from the night capsule), dry mouth, nausea, and headache. Less commonly, some people experience palpitations, raised blood pressure, dizziness, or difficulty urinating. If you experience chest pain, severe skin reactions, or breathing difficulties, stop taking the product and seek medical attention immediately.

How do I manage side effects of Sudafed Mucus Relief Day & Night?

For dry mouth, sip water regularly and avoid caffeine. If the day capsules make it harder to sleep, avoid taking your last day dose too close to bedtime. If you experience palpitations or a significant headache, stop taking the product and speak to your pharmacist or GP promptly.

Who should not take Sudafed Mucus Relief Day & Night?

This product is not suitable for children under 12, pregnant or breastfeeding women, or anyone taking MAOIs or having taken them within the past 14 days. People with severe high blood pressure, heart disease, hyperthyroidism, closed-angle glaucoma, or urinary retention should also avoid it. Always check with your pharmacist if you are unsure whether this product is right for you.

Can I take Sudafed Mucus Relief Day & Night if I have high blood pressure?

Pseudoephedrine can raise blood pressure, so this product is not recommended for people with severe hypertension. If your blood pressure is mildly elevated or well-controlled, speak to your GP or pharmacist before use — they can advise whether it is safe for you specifically. There may be alternative decongestants or nasal sprays that are more appropriate.

What happens if I miss a dose of Sudafed Mucus Relief Day & Night?

If you miss a day capsule dose, simply take the next one when it is due — do not double up to compensate. If you forget the night capsule and have already gone to bed, skip it and continue as normal the following day. Never take two doses at once.

How long can you use Sudafed Mucus Relief Day & Night for?

This product should not be used for more than 5 consecutive days. If your symptoms have not improved after 5 days, or if they worsen at any point, stop taking the capsules and consult your GP. Prolonged use of decongestants can sometimes cause rebound congestion or other complications.

Is Sudafed Mucus Relief Day & Night safe to take with other cold medicines?

You should not take this product alongside other medicines containing pseudoephedrine, phenylephrine, or diphenhydramine, as this increases the risk of side effects. Always check the ingredients of any other cold or flu remedy before combining it with this product. If in doubt, ask your pharmacist before taking anything together.

What are the alternatives to Sudafed Mucus Relief Day & Night?

Alternatives include Benylin Day & Night Cold Tablets, which contain paracetamol for pain and fever relief alongside a decongestant and diphenhydramine. Nasal saline sprays or steam inhalation are non-medicated options that can also help ease congestion. You can explore the full cold and flu range at Cured Pharmacy to compare available options.

Can I take Sudafed Mucus Relief Day & Night if I have sinus congestion rather than a cold?

The pseudoephedrine in this product can help relieve sinus congestion regardless of the underlying cause, but it is primarily indicated for cold symptoms. If your sinus congestion is related to allergies rather than a cold, you may find our allergy and hay fever range more appropriate. Speak to your pharmacist if you are unsure which product best suits your symptoms.

What are the latest findings on pseudoephedrine for nasal congestion?

Pseudoephedrine remains one of the most clinically studied oral decongestants and is recognised by the NHS as an effective short-term treatment for nasal congestion. It is considered more effective than phenylephrine for oral decongestant use, based on published clinical evidence. However, due to its cardiovascular effects, it is only recommended for short-term use in appropriate patients.

How Should You Use Sudafed Mucus Relief Day & Night?

Using this product correctly is straightforward, but it is important to follow the instructions carefully to get the most benefit and avoid side effects. The pack contains two types of capsule — day capsules and night capsules — and they are not interchangeable. Swallow each capsule whole with a full glass of water. Do not chew, crush, or open the capsules.

What Is the Correct Dose of Sudafed Mucus Relief Day & Night?

The dosage differs between the day and night capsules, so it is worth being clear on both before you start. Always stick to the recommended amounts — taking more will not relieve symptoms faster and increases the risk of side effects.

When Is the Best Time to Use Sudafed Mucus Relief Day & Night?

Timing matters with this product. Take your first day capsule as soon as your cold symptoms begin in the morning — this gives pseudoephedrine time to reduce nasal swelling before your day gets busy. Space subsequent day capsules at least 4 hours apart, and try to take your last day capsule no later than early evening to minimise any stimulant effect on sleep. The night capsule should be taken immediately before you get into bed, not hours earlier, as diphenhydramine acts relatively quickly and you should not be driving or doing anything that requires alertness once you have taken it.

How Long Can You Use Sudafed Mucus Relief Day & Night For?

This product is intended for short-term use only. Do not use it for more than 5 consecutive days. Most cold symptoms begin to improve within 3 to 5 days, and continuing beyond this point without medical advice is not recommended. If your symptoms persist after 5 days, worsen significantly, or are accompanied by a high fever, severe headache, or difficulty breathing, stop taking the capsules and contact your GP. Prolonged use of oral decongestants like pseudoephedrine can cause cardiovascular effects and is not appropriate as a long-term solution.

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 Sudafed Mucus Relief Day & Night?

Most people tolerate this product well when taken as directed, but some side effects can occur. The night capsules are more likely to cause drowsiness due to the diphenhydramine they contain, while the day capsules may occasionally cause mild stimulant-type effects from pseudoephedrine.

  • Drowsiness or sedation (particularly from the night capsule)
  • Dry mouth, nose, or throat
  • Nausea or mild stomach discomfort
  • Headache
  • Difficulty sleeping or restlessness (from the day capsule)

What Are the Less Common Side Effects of Sudafed Mucus Relief Day & Night?

Less frequently, some people experience side effects that are more related to the cardiovascular or urinary effects of pseudoephedrine. These are more likely in people who already have underlying health conditions, which is why it is important to check suitability before starting this product.

  • Palpitations or increased heart rate
  • Raised blood pressure
  • Dizziness or light-headedness
  • Urinary retention or difficulty passing urine (particularly in men with prostate enlargement)
  • Skin rash or itching
  • Blurred vision
  • Tremor or anxiety

What Are the Serious Side Effects of Sudafed Mucus Relief Day & Night?

Serious side effects are rare but can occur, particularly if the product is taken by someone for whom it is contraindicated. Stop taking the capsules immediately and seek urgent medical attention if you experience any of the following:

  • Chest pain or tightness
  • Severe or sudden headache
  • Difficulty breathing or swallowing
  • Severe allergic reaction (anaphylaxis) — including swelling of the face, lips, tongue, or throat
  • Significant rise in blood pressure

What Should You Do If You Experience Side Effects of Sudafed Mucus Relief Day & Night?

For mild side effects such as dry mouth or drowsiness, these often resolve on their own and do not usually require you to stop treatment. Staying well hydrated can help with dry mouth, and avoiding caffeine may reduce any restlessness caused by the day capsules. If a side effect is persistent, worsening, or causing you concern, stop taking the product and speak to 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 Sudafed Mucus Relief Day & Night Interact With Other Medicines?

Yes — this product has several clinically significant interactions. Pseudoephedrine should never be taken alongside MAOIs or within 14 days of stopping them, as this can cause a dangerous hypertensive crisis. Taking it with other sympathomimetics or decongestants increases cardiovascular risk. Diphenhydramine in the night capsule can enhance the sedative effects of alcohol, sleeping tablets, anxiolytics, and other antihistamines — so these combinations should be avoided. Beta-blockers and tricyclic antidepressants may also interact with pseudoephedrine. Always tell your pharmacist about all medicines you are taking, including herbal remedies and supplements, before starting this product.

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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