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Quick summary

Type of medicine

Cold and Flu Relief

Works by

Targeting cold and flu symptoms such as congestion, cough, and pain

Active Ingredient

Guaifenesin, Phenylephrine hydrochloride, Paracetamol

Effective within

30 minutes to 1 hour (varies by individual)



Side effects

Nervousness, Dizziness, Restlessness, Nausea, Upset Stomach

Medication details


Benylin Mucus Cold Tablets are a widely recognized over-the-counter medication in the UK, known for their effectiveness in providing relief from the discomfort of colds and flu. These tablets are designed to address the most bothersome symptoms associated with these common respiratory illnesses.

Colds and flu can bring on a range of symptoms, including nasal congestion, a persistent cough, sneezing, and a general feeling of malaise. Benylin Mucus Cold Tablets are formulated to target these issues specifically. By understanding the active ingredients and their mechanisms of action, you can better appreciate how this medication can help you feel better.


Proper usage of Benylin Mucus Cold Tablets is paramount to ensure maximum effectiveness and minimize any potential risks. It's essential to adhere to the recommended dosage and follow the directions carefully.

For adults and individuals aged 12 years and over, the recommended dosage is one tablet every four to six hours as needed. However, it's crucial not to exceed four tablets within a 24-hour period. This dosage regimen allows for consistent relief while ensuring safety.

It's important to remember that Benylin Mucus Cold Tablets are intended for adult use only. Children under 12 years old should not be given this medication. Instead, consult with a healthcare professional for appropriate treatment options for children.

To take the tablets, swallow them whole with a glass of water. Avoid chewing or crushing the tablets, as this can alter their intended release mechanism. Additionally, refrain from consuming alcohol while taking Benylin Mucus Cold Tablets, as alcohol can potentiate certain side effects.

If your symptoms persist for more than seven days or worsen despite using the medication, it is advisable to seek medical advice. Prolonged or severe symptoms may indicate an underlying condition that requires further evaluation by a healthcare provider.

Lastly, always read and closely follow the instructions provided on the product packaging. These instructions contain essential information to ensure safe and effective use of the medication.


Benylin Mucus Cold Tablets contain a combination of active ingredients that work synergistically to alleviate the various symptoms associated with colds and flu. Understanding these ingredients and their functions can help you make an informed choice when selecting this medication.

Guaifenesin (100mg): Guaifenesin is an expectorant. It works by thinning and loosening mucus in the airways, making it easier to expel. This action helps to relieve congestion and alleviate the discomfort caused by excessive mucus production.

Phenylephrine hydrochloride (6.1mg): Phenylephrine is a decongestant. It acts by constricting the blood vessels in the nasal passages, reducing swelling and congestion. This helps to open up the airways, making breathing easier and reducing that blocked feeling in the nose.

Paracetamol (500mg): Paracetamol is a common pain reliever and fever reducer. It can help reduce fever and alleviate aches and pains associated with colds and flu. By addressing these symptoms, paracetamol can contribute to an overall sense of relief.

In addition to these active ingredients, Benylin Mucus Cold Tablets may contain inactive ingredients such as binding agents and fillers, which help form the tablet and aid in its stability. It's essential to read the product packaging for a complete list of both active and inactive ingredients, especially if you have known allergies or sensitivities to any components.

Understanding these ingredients and their roles can give you confidence in the medication's ability to provide relief from cold and flu symptoms. However, it's essential to be aware of potential side effects and warnings to ensure safe usage.

Side Effects

While Benylin Mucus Cold Tablets are generally well-tolerated when used as directed, it's important to be aware of potential side effects that may occur. Common side effects associated with this medication may include:

Nervousness: Some individuals may experience feelings of restlessness or nervousness as a result of the medication's stimulating properties, particularly due to the decongestant (phenylephrine) component.

Dizziness: Dizziness can occasionally occur, especially if the medication leads to changes in blood pressure. It is advisable to avoid activities that require alertness, such as driving or operating heavy machinery, if you experience dizziness.

Restlessness: Restlessness or difficulty sleeping may occur, particularly if the medication is taken too close to bedtime due to its stimulating effects.

Nausea: Mild nausea or an upset stomach may be experienced by some users, although this is relatively rare.
Upset Stomach: Occasionally, individuals may experience gastrointestinal discomfort, such as stomach upset or indigestion while taking Benylin Mucus Cold Tablets.

These side effects are generally mild and temporary, resolving as the medication's effects wear off. However, if you encounter severe or persistent side effects or experience any unusual reactions, it's advisable to discontinue use and seek medical attention promptly.


Before using Benylin Mucus Cold Tablets, it's important to take note of several warnings and precautions to ensure safe and effective use of the medication.

Allergies: If you have known allergies to any of the active or inactive ingredients in Benylin Mucus Cold Tablets, do not use this medication. Allergic reactions can range from mild skin rashes to severe anaphylaxis, a potentially life-threatening condition.

Underlying Medical Conditions: If you have certain underlying medical conditions, including high blood pressure, heart disease, diabetes, thyroid problems, prostate issues, or kidney and liver diseases, it's advisable to consult a healthcare professional before using this medication. These conditions may necessitate special considerations or adjustments in dosage.

Monoamine Oxidase Inhibitors (MAOIs): Do not use Benylin Mucus Cold Tablets if you are taking or have taken MAOIs within the last 14 days. Serious interactions can occur when MAOIs are combined with this medication.

Pregnancy and Breastfeeding: If you are pregnant or breastfeeding, consult with a healthcare professional before using Benylin Mucus Cold Tablets. They can provide guidance on the safety of the medication during pregnancy or while nursing.

Dosage Limitation: It is crucial not to exceed the recommended dosage of four tablets within a 24-hour period. Excessive use can lead to serious health risks, including liver damage.

Storage: Keep Benylin Mucus Cold Tablets out of the reach of children and store them in a cool, dry place. Follow the storage instructions on the packaging to maintain the medication's integrity.

Medically reviewed and published

  • This page was medically reviewed by Dr Sohaib Imtiaz, Clinical Lead on Oct 11, 2023, 9:45 am

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Please read our FAQs page to find out more.

Can I take Benylin Mucus Cold Tablets with other cold or flu medications?

It's generally not advisable to combine multiple cold or flu medications without consulting a healthcare professional. Benylin Mucus Cold Tablets already contain active ingredients like guaifenesin, phenylephrine, and paracetamol to address common cold and flu symptoms. Combining them with other medications may increase the risk of side effects or drug interactions. If you're considering using additional medications, seek guidance from a healthcare provider to ensure safe and effective treatment.

How quickly can I expect relief after taking Benylin Mucus Cold Tablets?

The onset of relief can vary from person to person. Typically, you can expect some relief within 30 minutes to an hour after taking the tablets. However, the full effect may take a bit longer. It's essential to follow the recommended dosage and allow sufficient time for the medication to work. If your symptoms persist or worsen, consult a healthcare professional.

Can I use Benylin Mucus Cold Tablets if I have high blood pressure?

If you have high blood pressure, it's advisable to consult with a healthcare provider before using Benylin Mucus Cold Tablets. The active ingredient phenylephrine can affect blood pressure, and individuals with hypertension may need to exercise caution or consider alternative treatments. Your healthcare provider can provide personalized guidance based on your specific medical condition and history.

Are there any specific dietary restrictions while taking Benylin Mucus Cold Tablets?

While there are no specific dietary restrictions, it's a good practice to avoid consuming alcohol while taking this medication. Alcohol can potentiate certain side effects, such as dizziness and drowsiness, which can be exacerbated by the medication's effects. Staying hydrated and maintaining a balanced diet can also aid in your recovery from a cold or flu.

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