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What is Phenylephrine? Uses & Dosage

Phenylephrine, also known as phenylephrine hydrochloride, is a type of medication that’s used to relieve nasal congestion caused by colds, hay fever , and allergies. It can also be used to treat pressure and congestion in the sinuses. Phenylephrine HCL is part of a class of medications called nasal decongestants. These products work by reducing swelling in blood vessels within the nasal passages.

If you’re suffering from nasal congestion, a phenylephrine decongestant may help. Let’s look at how phenylephrine works, the possible side effects, and the recommended dosage.

What does phenylephrine do?

Phenylephrine works by decreasing swelling in the nose and ears. It also thins and loosens mucus in the airways to clear congestion and make it easier for you to breathe through the nose.

Please be advised that this product is not usually used for long-term conditions, and it will not cure the underlying cause of your symptoms or speed up recovery. If you’re using phenylephrine to self-treat, it’s essential that you read the package instructions carefully before use. This way, you can make sure it’s suitable for your needs.

Cough and cold products like phenylephrine hydrochloride are not viewed as effective or safe for children under six years old. Additionally, certain medications (e.g., long-acting tablets/capsules) are not recommended for use in children younger than 12 years.

You should avoid using medications with similar ingredients to phenylephrine at the same time. Speak to your doctor or pharmacist for more information about using these products safely.

Potential phenylephrine side effects

Like many medications, phenylephrine hydrochloride has some potential side effects. That said, decongestants do not usually have many side effects, and any symptoms you may experience are likely to be mild.

Nevertheless, possible side effects of phenylephrine can include:

  • Nervousness

  • Headaches

  • Dizziness

  • Insomnia

  • Nausea, vomiting, diarrhoea

  • Increased blood pressure.

Side effects should subside once you stop taking the medication. If you experience any side effects while using phenylephrine medication, speak to your doctor.

Phenylephrine dosage guidance

Always read and follow the product packaging to know the correct phenylephrine dosage. You should not take any more or less of this medication than instructed, nor should you take it more often than recommended.

While taking phenylephrine, you should drink plenty of fluids, as this can help to break down mucus and clear congestion.

If you’re suffering with congestion , products that contain phenylephrine like SUDAFED® Block Nose and Sinus Capsules can help to relieve your symptoms. Adults and children over 16 years can take two capsules every four to six hours as needed. Do not exceed the maximum dosage of eight capsules within 24 hours.

Do not continue to take your phenylephrine dosage for more than three days without consulting a doctor.

Phenylephrine vs pseudoephedrine

Both phenylephrine and pseudoephedrine are types of decongestants. They offer relief from congestion and sinus pressure and can be purchased in tablet form.

While phenylephrine can provide short-term relief of cold and allergy symptoms, pseudoephedrine is more commonly used for extended-release and long-acting treatment.

Products like SUDAFED® Decongestant Tablets , which contain pseudoephedrine, provides effective relief for congestion symptoms. It’s also often mixed with other active ingredients to offer more effective treatment against cough, cold, and allergy symptoms.

Phenylephrine and pseudoephedrine are similar in that they help to provide short-term relief for congestion symptoms, but they differ when it comes to side effects. Always read the product label and leaflet to understand possible side effects of a product.

Phenylephrine FAQs

Unless specified by your doctor, there aren’t any specific dietary requirements with phenylephrine. It can be taken with or without food.

Ensure that the phenylephrine product is kept in the container that it came in. It should also remain tightly closed and out of the reach of children. Store at room temperature and keep it away from excess moisture and heat.

When disposing of the medication, ensure that it’s placed in a location where children, pets and other people cannot access them. You should never flush medication products down the toilet. If you want to dispose of your medication in an eco-friendly way, talk to your pharmacist or local council about any recycling medicine take-back programmes available in your area.

FOR PRODUCTS IN IRELAND

ALWAYS READ THE LABEL. Sudafed® Nasal Spray Solution contains xylometazoline hydrochloride. Non-Drowsy Sudafed® Decongestant Tablets contain pseudoephedrine hydrochloride. Non-Drowsy Sudafed® Decongestant Syrup contains pseudoephedrine hydrochloride. Non-Drowsy Sudaplus® Tablets contain paracetamol and pseudoephedrine hydrochloride. Ask your pharmacist for advice.

© JNTL Consumer Health I (Ireland) Limited, 2023

ALWAYS READ THE LABEL.

SUDAFED® Blocked Nose Spray (xylometazoline) (12+ years).

SUDAFED® Congestion & Headache Relief Max Strength Capsules (16+ years).

SUDAFED® Congestion & Headache Relief Day & Night Capsules (16+ years).

SUDAFED® Decongestant Tablets (Pseudoephedrine) (12+ years).

SUDAFED® Sinus Ease 0.1% Nasal Spray (Xylometazoline) (12+ years).

SUDAFED® Sinus Max Strength Capsules (16+ years).

SUDAFED® Mucus Relief Triple Action Cold & Flu Tablets (12+ years).

SUDAFED® Sinus Pressure & Pain Film-Coated Tablets (15+ years).

SUDAFED® Decongestant Liquid (Pseudoephedrine) (6+ years).

SUDAFED® Blocked Nose and Sinus Capsules (16+ years).

SUDAFED® Plus Blocked Nose Nasal Spray Solution (12+ years).

SUDAFED® Natural Relief Blocked Nose Spray is a medical device (from Birth).

© Johnson & Johnson Limited, 2023

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Site last updated on: 7th January 2024 (UK-SU-2300142)

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