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Optrex Allergy Eye Drops 10ml

Optrex Allergy Eye Drops 10ml

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  • ✔️ Relieves itchy, red, watery eyes caused by allergies
  • ✔️ Contains sodium cromoglicate 2% — clinically established mast cell stabiliser
  • ✔️ Suitable for adults and children aged 6 and over
  • ✔️ Works preventatively to reduce allergic eye reactions daily
  • ✔️ Preservative-aware formula for regular seasonal use

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Are Optrex Allergy Eye Drops Right for Your Itchy Eyes?

 

If your eyes itch, water, and turn red every time pollen season arrives, you are far from alone. Allergic conjunctivitis affects millions of people in the UK each year, and it can make even a simple walk outside feel miserable. Allergy eye drops are one of the most targeted ways to tackle those symptoms directly at the source — and Optrex Allergy Eye Drops 10ml are a trusted, pharmacy-recommended option available without a prescription. Priced at just £6.79, they offer a straightforward solution for adults and children aged 6 and over. You can browse the full range of products for seasonal and year-round symptoms in our allergy and hay fever collection.

Each 10ml bottle contains sodium cromoglicate 2% w/v as the active ingredient. This is a well-established, clinically studied compound that has been used in eye care for decades. It works preventatively as well as symptomatically, which means regular use throughout the allergy season can help keep reactions under control rather than just firefighting each flare-up.

 

How Do Optrex Allergy Eye Drops Work in the Eye?

 

Sodium cromoglicate belongs to a class of medicines called mast cell stabilisers. When an allergen — such as pollen, pet dander, or dust mite particles — comes into contact with the surface of your eye, it triggers mast cells in the conjunctiva to release histamine and other inflammatory mediators. That release is what causes the itching, redness, and watering you experience. Sodium cromoglicate works by stabilising those mast cells so they are less likely to release their inflammatory contents in the first place.

  • Allergen contacts the conjunctival surface of the eye
  • Mast cells are activated and would normally release histamine
  • Sodium cromoglicate stabilises mast cell membranes, reducing histamine release
  • Inflammatory response is dampened, relieving itching, redness, and watering

Because it works preventatively, sodium cromoglicate is most effective when used regularly — ideally starting before your allergy season begins, or at the first sign of symptoms.

 

Who Should Use Optrex Allergy Eye Drops?

 

These drops are designed for anyone who experiences eye symptoms as part of an allergic reaction. That includes seasonal allergic conjunctivitis triggered by grass or tree pollen, as well as perennial (year-round) allergic conjunctivitis caused by indoor allergens like dust mites or pet hair. They are suitable for:

  • Adults experiencing hay fever-related eye symptoms
  • Children aged 6 years and over with allergic conjunctivitis
  • People who find oral antihistamines alone do not fully control their eye symptoms
  • Those looking for a preservative-aware topical option for regular seasonal use

They are not suitable for children under 6 years without medical supervision, and you should speak to your GP or pharmacist if you are pregnant, breastfeeding, or have a pre-existing eye condition before starting use.

 

How Do Optrex Allergy Eye Drops Compare to Other Eye Allergy Treatments?

 

Feature Optrex Allergy Eye Drops Oral Antihistamine (e.g. cetirizine)
Active ingredient Sodium cromoglicate 2% Cetirizine / loratadine
Route of action Topical — acts directly in the eye Systemic — acts throughout the body
Onset of effect Builds with regular use; some relief quickly Usually within 1 hour
Drowsiness risk None Possible (especially older antihistamines)

 

Are Optrex Allergy Eye Drops Safe to Store and Use Long-Term?

 

Storage is straightforward. Keep the bottle below 25°C, away from direct sunlight, and out of reach of children. Once opened, the drops should be discarded after 28 days — even if liquid remains — to reduce the risk of contamination and infection. Do not refrigerate. If you also use other eye care products, leave at least five minutes between applying different eye drops to allow each one to be properly absorbed.

These allergy eye drops are generally well tolerated for seasonal use. However, if your symptoms do not improve within a few days of regular use, or if you notice any change in your vision, increased redness, or discharge, stop using the drops and seek advice from your pharmacist or GP promptly.

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.

Optrex Allergy Eye Drops 10ml specifications
Treatment category Allergic conjunctivitis / hay fever eye symptoms
Active ingredient Sodium cromoglicate 2% w/v
Mechanism of action Mast cell stabiliser — reduces histamine release in the conjunctiva
Drug class Mast cell stabiliser
Preparation Aqueous eye drops solution
Route of administration Ophthalmic (topical)
Pack size 10ml
Suitable for Adults and children aged 6 years and over
UK classification General Sale List (GSL)
Effective for Itchy, watery, red eyes due to allergic conjunctivitis

Specifications of Optrex Allergy Eye Drops 10ml

 

What Are Optrex Allergy Eye Drops and What Are They Used For?

 

Optrex Allergy Eye Drops 10ml are an over-the-counter ophthalmic solution containing sodium cromoglicate 2% w/v. They are used to relieve and prevent the eye symptoms associated with allergic conjunctivitis — a condition where the conjunctiva (the thin membrane covering the white of the eye and the inside of the eyelids) becomes inflamed in response to an allergen. Common triggers include grass pollen, tree pollen, house dust mites, and animal dander.

Symptoms of allergic conjunctivitis include itching, redness, watering, and a gritty or burning sensation in the eyes. These drops are indicated for both seasonal allergic conjunctivitis (linked to hay fever) and perennial allergic conjunctivitis (year-round). They are classified as a General Sale List (GSL) medicine in the UK, meaning no prescription is required.

 

What Do You Need to Know Before Using Optrex Allergy Eye Drops?

 

Before using these drops, read the following carefully. There are some situations where you should not use them, or where you should seek advice first.

Do not use these drops if you:

  • Are allergic to sodium cromoglicate or any other ingredient in the formulation
  • Are wearing soft contact lenses at the time of application
  • Are under 6 years of age (without medical supervision)

Speak to your pharmacist or GP before use if you:

  • Are pregnant or breastfeeding
  • Have a diagnosed eye condition such as glaucoma or dry eye syndrome
  • Have recently had eye surgery
  • Experience eye pain, sudden change in vision, or significant discharge — these may indicate a different condition requiring medical assessment

Drug interactions:

  • No clinically significant interactions have been reported with topical sodium cromoglicate at standard ophthalmic doses
  • If you use other eye drops or eye ointments, leave at least 5 minutes between applications
  • Always inform your pharmacist of all medicines you are taking, including herbal remedies

 

How Should You Use Optrex Allergy Eye Drops Correctly?

 

Using eye drops correctly makes a real difference to how well they work. Follow these steps each time you apply the drops.

  1. Wash your hands thoroughly with soap and water before handling the bottle
  2. Remove soft contact lenses before applying the drops
  3. Tilt your head back slightly and look upward
  4. Gently pull down your lower eyelid to create a small pocket
  5. Hold the dropper tip close to your eye without touching it, and instil 1–2 drops into the pocket
  6. Close your eye gently and press lightly on the inner corner for about one minute to help absorption
  7. Repeat in the other eye if needed
  8. Replace the cap immediately after use
  9. Wait at least 30 minutes before reinserting soft contact lenses
Indication Age Group Dose Frequency
Allergic conjunctivitis Adults and children aged 6+ 1–2 drops per affected eye 4 times daily
Allergic conjunctivitis Children under 6 Not recommended without medical advice

For best results, use the drops regularly throughout your allergy season — even on days when symptoms feel mild. Sodium cromoglicate works best as a preventative treatment rather than a rescue remedy. If you are managing broader hay fever symptoms alongside your eye symptoms, you may find it helpful to explore our allergy and hay fever range for complementary treatments.

 

What Are the Possible Side Effects of Optrex Allergy Eye Drops?

 

Like all medicines, Optrex Allergy Eye Drops can cause side effects, although not everyone experiences them. Most side effects are mild and localised to the eye.

Common side effects:

  • Transient stinging or burning sensation immediately after instillation
  • Temporary blurred vision (usually clears within a few minutes)
  • Mild eye irritation

Less common side effects:

  • Watering of the eyes shortly after application
  • Redness of the eye (if this worsens rather than improves, stop use and seek advice)
  • Sensitivity to light

Stop using the drops and contact your GP or pharmacist if you experience severe eye pain, significant worsening of redness, swelling around the eye, or any change in your vision. These could indicate a more serious condition that needs prompt assessment.

 

How Should You Store Optrex Allergy Eye Drops?

 

  • Store below 25°C in a cool, dry place
  • Do not refrigerate or freeze
  • Keep out of direct sunlight
  • Keep the bottle tightly closed when not in use
  • Discard 28 days after first opening, even if liquid remains
  • Keep out of the reach and sight of children
  • Do not use after the expiry date printed on the bottle and carton

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 Optrex Allergy Eye Drops online in the UK?

You can buy Optrex Allergy Eye Drops 10ml online from Cured Pharmacy for £6.79 with fast UK delivery. No prescription is needed as they are a General Sale List medicine. They are also available over the counter at most UK pharmacies and supermarkets.

How do Optrex Allergy Eye Drops work in the eye?

Optrex Allergy Eye Drops contain sodium cromoglicate 2%, which works as a mast cell stabiliser. When an allergen contacts your eye, mast cells would normally release histamine, causing itching and redness. Sodium cromoglicate prevents that release, reducing the allergic response at the source.

How do I use Optrex Allergy Eye Drops step by step?

Wash your hands first, then tilt your head back and gently pull down your lower eyelid. Instil 1–2 drops into the pocket formed, close your eye gently, and press lightly on the inner corner for about one minute. Avoid touching the dropper tip to your eye or any surface to prevent contamination.

How many times a day should I use Optrex Allergy Eye Drops?

The recommended dose for adults and children aged 6 and over is 1–2 drops in each affected eye, four times daily. Try to space the doses evenly throughout the day — for example, morning, midday, late afternoon, and evening. Consistent use gives the best results during allergy season.

Can children use Optrex Allergy Eye Drops?

Yes, Optrex Allergy Eye Drops are suitable for children aged 6 years and over at the same dose as adults. They should not be used in children under 6 years of age without specific medical advice. If your child is under 6 and experiencing eye allergy symptoms, speak to your GP before using any eye drops.

Can I wear contact lenses when using Optrex Allergy Eye Drops?

You must remove soft contact lenses before applying Optrex Allergy Eye Drops. Wait at least 30 minutes after instilling the drops before reinserting your lenses. Hard (rigid gas permeable) contact lenses should also be removed; check with your optician or pharmacist if you are unsure.

What are the side effects of Optrex Allergy Eye Drops?

The most commonly reported side effects are a brief stinging or burning sensation immediately after applying the drops, and temporary blurred vision that clears within a few minutes. Less commonly, some people notice mild eye irritation or increased watering shortly after use. These effects are generally mild and short-lived.

What should I do if Optrex Allergy Eye Drops sting when I use them?

A brief stinging sensation immediately after instillation is a known and common side effect of sodium cromoglicate eye drops and usually passes within a minute or two. If the stinging is severe, prolonged, or accompanied by worsening redness or pain, stop using the drops and speak to your pharmacist or GP. Do not rub your eyes, as this can worsen irritation.

How long does it take for Optrex Allergy Eye Drops to work?

Sodium cromoglicate works best as a preventative treatment, so it builds up its protective effect with regular use over several days. Some people notice an improvement in symptoms within a few days of starting regular use. For seasonal allergies, starting the drops before your allergy season begins can help prevent symptoms from developing in the first place.

How long can I use Optrex Allergy Eye Drops for?

Optrex Allergy Eye Drops can be used throughout your allergy season with regular daily use. Once opened, the bottle must be discarded after 28 days regardless of how much liquid remains. If your symptoms persist beyond a few days of regular use, or if they worsen at any point, consult your pharmacist or GP for further assessment.

Are Optrex Allergy Eye Drops suitable during pregnancy?

If you are pregnant or breastfeeding, you should speak to your GP or pharmacist before using Optrex Allergy Eye Drops. While topical sodium cromoglicate has limited systemic absorption, it is always best to seek professional advice before using any medicine during pregnancy or whilst breastfeeding. Your healthcare provider can help you weigh up the benefits and any potential risks.

What happens if I miss a dose of Optrex Allergy Eye Drops?

If you forget to use your drops at the scheduled time, apply them as soon as you remember. However, if it is nearly time for your next dose, skip the missed one and carry on with your regular schedule. Do not apply extra drops to make up for a missed dose, as this will not improve the outcome and may cause unnecessary irritation.

What are the alternatives to Optrex Allergy Eye Drops?

Other allergy eye drops available in the UK include those containing azelastine (an antihistamine eye drop) or olopatadine, which combine antihistamine and mast cell stabilising effects. Oral antihistamines such as cetirizine or loratadine can also help with eye symptoms as part of broader hay fever management. You can explore a wider range of options in our eye care collection.

Can I use Optrex Allergy Eye Drops with other hay fever medicines?

Yes, Optrex Allergy Eye Drops can generally be used alongside oral antihistamines or nasal sprays for hay fever, as the eye drops act locally in the eye with minimal systemic absorption. No clinically significant drug interactions have been reported with topical sodium cromoglicate. Always let your pharmacist know all the medicines you are taking so they can check for any potential issues.

What is the latest research on sodium cromoglicate eye drops for allergies?

Sodium cromoglicate has been used in the management of allergic conjunctivitis for several decades and remains a recommended treatment option in UK clinical guidelines. It is well established as a safe and effective mast cell stabiliser for both seasonal and perennial allergic conjunctivitis. Current NHS guidance continues to support its use as a first-line topical treatment for eye allergy symptoms, particularly for those who prefer a non-antihistamine approach.

How Should You Use Optrex Allergy Eye Drops?

Using Optrex Allergy Eye Drops correctly ensures you get the most benefit from each dose and reduces the risk of contamination or irritation. Always wash your hands before handling the bottle, and never allow the dropper tip to touch your eye, eyelid, or any other surface.

Follow these steps each time you apply the drops:

What Is the Correct Dose of Optrex Allergy Eye Drops?

The dose is the same for adults and children aged 6 and over. Do not exceed the recommended number of drops per application, as using more will not improve the effect and may cause unnecessary irritation. Always follow the instructions in the patient information leaflet supplied with the product.

When Is the Best Time to Use Optrex Allergy Eye Drops?

Space your four daily doses as evenly as possible throughout the day — for example, on waking, at midday, in the late afternoon, and before bed. This helps maintain a consistent level of protection in the eye throughout the day. If you know you will be exposed to a specific allergen, such as spending time outdoors during high pollen periods, applying a dose shortly beforehand can be particularly helpful.

Because sodium cromoglicate works preventatively, starting the drops at the beginning of your allergy season — or even just before it begins — gives the best chance of keeping symptoms under control from the outset.

How Long Can You Use Optrex Allergy Eye Drops For?

These drops can be used throughout your allergy season with regular daily use. Once you open the bottle, it must be discarded after 28 days, even if liquid remains, to prevent the risk of eye infection from a contaminated bottle. If your symptoms have not improved after a few days of regular use, or if they worsen at any point, stop using the drops and speak to your pharmacist or GP.

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 Optrex Allergy Eye Drops?

Most people who use Optrex Allergy Eye Drops tolerate them well, but as with any medicine, side effects can occur. The most frequently reported effects are localised to the eye and are generally mild and short-lived.

  • Transient stinging or burning sensation immediately after instillation
  • Temporary blurred vision lasting a few minutes after application
  • Mild eye irritation or discomfort

These effects typically resolve on their own within a few minutes. If you experience stinging, try to resist rubbing your eyes, as this can worsen irritation and potentially introduce bacteria to the eye surface.

What Are the Less Common Side Effects of Optrex Allergy Eye Drops?

Less commonly, some people notice additional effects after using sodium cromoglicate eye drops. These are not experienced by the majority of users but are worth being aware of.

  • Increased watering of the eyes shortly after application
  • Redness of the eye (distinct from the redness caused by the allergy itself)
  • Sensitivity to light (photophobia)
  • A feeling of something in the eye (foreign body sensation)

If any of these effects persist or feel particularly bothersome, speak to your pharmacist. They can advise whether you should continue using the drops or try an alternative treatment.

What Are the Serious Side Effects of Optrex Allergy Eye Drops?

Serious side effects with topical sodium cromoglicate are rare. However, you should stop using the drops immediately and seek medical attention if you experience any of the following:

  • Severe eye pain that does not resolve quickly
  • Significant worsening of redness or swelling around the eye
  • Any sudden change in your vision
  • Discharge from the eye (which may suggest an infection rather than an allergy)
  • Signs of an allergic reaction to the drops themselves, such as swelling of the eyelids, face, or lips

These symptoms could indicate a more serious eye condition that requires prompt medical assessment. Do not delay seeking help if you are concerned.

What Should You Do If You Experience Side Effects?

For mild side effects such as brief stinging or temporary blurred vision, no specific action is usually needed — simply wait a few minutes for the sensation to pass. Avoid driving or operating machinery until your vision has fully cleared after applying the drops.

If side effects are persistent, severe, or worrying, stop using the drops and contact your pharmacist or GP. You should also report any suspected side effects to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk. This helps improve the safety monitoring of medicines for everyone.

Can Optrex Allergy Eye Drops Interact With Other Medicines?

No clinically significant drug interactions have been reported with topical sodium cromoglicate at standard ophthalmic doses. Because the drops act locally in the eye with very limited systemic absorption, the risk of interactions with oral medicines is considered very low.

If you use other eye drops or eye ointments, leave at least five minutes between applying each product. Eye ointments should generally be applied last. Always inform your pharmacist of all medicines you are currently taking — including over-the-counter products and herbal remedies — so they can check for any potential concerns specific to your situation.

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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