A decongestant in eye and nasal drops
Naphazoline
An over-the-counter decongestant in eye and nasal drops that briefly relieves redness and congestion by narrowing small blood vessels.
What is Naphazoline?
Naphazoline is a decongestant found in some eye and nasal drops. It narrows the small blood vessels in the eye or lining of the nose, reducing redness and the feeling of congestion. It is intended only for short-term use, because using decongestant drops for too long can cause rebound redness or congestion that is worse than before. It should be kept well away from children, as swallowing these drops can be dangerous, and used with caution by people with glaucoma or certain other conditions.
Education and reference only. This is a plain-language guide to Naphazoline — it deliberately contains no doses. Doses depend on the person, the brand and the reason for treatment, and belong with your prescriber. Always check the BNF, the product labelling (SmPC) and follow medical advice.
What it is
Naphazoline is a topical decongestant used in eye drops to take the redness out of irritated eyes, and in nasal drops or sprays to relieve a blocked-feeling nose. It works locally where it is applied rather than throughout the body. It is intended for short-term relief of minor redness or congestion, not for long-term daily use, and is available in pharmacy products.
How it works
Naphazoline acts on the muscle in the walls of small blood vessels, making them narrow. In the eye, this reduces the flow of blood through the surface vessels, so the white of the eye looks less red. In the nose, narrowing the swollen vessels in the lining shrinks the tissue and opens the airway, easing the blocked feeling. The effect is local and temporary, which is why repeated, prolonged use can backfire and cause symptoms to rebound.
Company & origin
Originated / developed by: Various (widely available).
A decongestant used in eye and nasal drops to relieve redness and a blocked, congested feeling. It belongs to the same family of vasoconstrictor decongestants as several pharmacy eye and nose products, and is used for short-term, symptomatic relief of red, irritated eyes and stuffy noses.
Practical use
How to take Naphazoline
General, dose-free guidance — always follow your prescriber's and the leaflet's specific instructions.
- Use the drops or spray for the shortest time needed, typically only a few days, to avoid rebound symptoms.
- Follow the product instructions for how to apply the drops and avoid touching the dropper tip to the eye or nose.
- Store it safely out of the sight and reach of children, as swallowing the drops can be dangerous.
- Stop using it and seek advice if redness or congestion worsens or does not settle.
- Check with a pharmacist first if you have glaucoma, heart or thyroid problems, or high blood pressure.
Weighing it up
Advantages & disadvantages of Naphazoline
Advantages
- Quickly reduces eye redness or a blocked-feeling nose.
- Acts locally where applied, with little spread through the body when used correctly.
- Available without prescription for short-term relief.
Disadvantages
- Can cause rebound redness or congestion if used for too long.
- Only relieves symptoms and does not treat the underlying cause.
- Can be dangerous if swallowed, especially by children.
Practical use
Good to know
The key caution is rebound: using decongestant eye or nasal drops for more than a few days can lead to worse redness or congestion when they wear off, sometimes trapping people in a cycle of needing more. They should be used for the shortest time possible. Naphazoline must be kept out of the reach of children, because swallowing the drops can cause serious effects. People with glaucoma, heart conditions, high blood pressure or thyroid problems should check before using it.
Who should not take it / use with caution
- Young children, except under specific medical advice, because of the risk if drops are swallowed.
- People with narrow-angle glaucoma, who should avoid eye decongestants unless advised.
- People with poorly controlled heart disease, high blood pressure or thyroid problems without checking first.
Monitoring
- No blood tests are needed; judge by symptom relief and duration of use.
- Watch for worsening redness or congestion that suggests rebound.
- Review with a clinician if symptoms persist beyond a few days.
Side effects
- Temporary stinging, burning or dryness where the drops are applied.
- Rebound redness or congestion after prolonged use.
- Occasionally, blurred vision after eye drops or a brief raised heart rate.
Key interactions
- Can interact with some antidepressants, including older tricyclics and MAOI types, so check first.
- May add to the effects of other decongestants or stimulants.
- Tell a pharmacist about heart, blood pressure or eye medicines before using it.
Available as: Eye drops and nasal drops or sprays for short-term use.
Answers
Naphazoline: frequently asked questions
Why should I only use it for a few days?
Decongestant drops can cause a rebound effect, where the redness or congestion comes back worse once they wear off, especially after prolonged use. Keeping use short helps avoid getting caught in a cycle of needing more.
Is it dangerous if a child swallows the drops?
Yes. Swallowing decongestant eye or nasal drops can cause serious effects in children, so they must be stored safely out of sight and reach. If a child swallows them, seek urgent medical advice.
Can I use it if I have glaucoma?
People with narrow-angle glaucoma should generally avoid decongestant eye drops unless a doctor advises otherwise, because they can affect the eye. Check with a pharmacist or doctor before using it.
Does it cure the redness or congestion?
No, it only relieves the symptom for a while by narrowing blood vessels. The underlying cause, such as an allergy, irritation or a cold, still needs to be addressed if symptoms keep returning.
What if my eyes or nose get worse?
Stop using the drops and seek advice. Worsening redness or congestion can be a sign of rebound from overuse, or of another problem that needs assessing rather than more decongestant.
Authoritative sources
- BNF
- NICE CKS
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