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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 proven mast cell stabiliser
  • ✔️ Suitable for adults and children aged 6 and over
  • ✔️ Works preventatively — best started before allergy season begins
  • ✔️ Compact 10ml bottle — easy to carry during hay fever season

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Are Optrex Allergy Eye Drops Right for You?

 

If your eyes itch, water, or turn red every time pollen season arrives, you are far from alone. Allergic eye symptoms affect millions of people across the UK each year, and finding something that actually works can feel like a challenge. Allergy eye drops containing sodium cromoglicate — like Optrex Allergy Eye Drops 10ml — are a well-established, pharmacist-recommended option for managing these symptoms without a prescription. Available from our eye care collection, this 10ml bottle offers a practical, easy-to-use solution for everyday allergic eye discomfort.

Optrex Allergy Eye Drops contain sodium cromoglicate 2% w/v as the active ingredient. This is a clinically recognised treatment for allergic conjunctivitis — the inflammation of the conjunctiva triggered by allergens such as pollen, pet dander, dust mites, and mould spores. The drops are suitable for adults and children aged 6 and over, and they are available over the counter, meaning no GP appointment is needed.

 

How Do Optrex Allergy Eye Drops Work?

 

Sodium cromoglicate works as a mast cell stabiliser. When your eyes are exposed to an allergen, mast cells in the conjunctival tissue release histamine and other inflammatory mediators — and that is what causes the itching, redness, and watering. Sodium cromoglicate prevents those mast cells from degranulating in the first place, stopping the allergic reaction before it takes hold.

  • Allergen enters the eye and binds to IgE antibodies on mast cells
  • Sodium cromoglicate stabilises the mast cell membrane
  • Histamine and other mediators are not released
  • Allergic symptoms — itching, redness, watering — are reduced or prevented

It is worth noting that sodium cromoglicate works best when used regularly and before symptoms peak. Starting treatment a few days before your typical allergy season begins can make a noticeable difference to how well it controls your symptoms.

 

Who Should Use Optrex Allergy Eye Drops?

 

These drops are designed for anyone experiencing allergic conjunctivitis — whether that is triggered by seasonal hay fever or year-round allergens. If your eyes are consistently itchy, red, or watery during allergy season, this product is worth considering. You might also find it useful alongside other allergy treatments from our allergy and hay fever range.

  • Adults and children aged 6 years and over
  • People with seasonal allergic conjunctivitis (hay fever-related eye symptoms)
  • Those with perennial allergic conjunctivitis caused by dust mites or pet dander
  • Patients looking for a preservative-containing, OTC eye drop option

 

How Do Optrex Allergy Eye Drops Compare to Alternatives?

 

Feature Optrex Allergy Eye Drops (Sodium Cromoglicate 2%) Antihistamine Eye Drops (e.g. Ketotifen)
Mechanism Mast cell stabiliser — prevents histamine release Antihistamine — blocks histamine receptors
Onset of action Gradual — works best with regular use Faster — provides more immediate relief
Suitable for children Yes, aged 6 and over Varies by product — check individual labelling
Contact lens use Remove soft lenses before use Remove soft lenses before use

 

How Should You Store Optrex Allergy Eye Drops?

 

Store the bottle below 25°C and keep it out of direct sunlight. Do not refrigerate. Once opened, the drops should be discarded after 28 days — even if there is still liquid remaining in the bottle. This is because the preservative system can degrade over time, increasing the risk of eye infection. Write the opening date on the bottle so you do not lose track.

Using allergy eye drops correctly — including proper storage — is just as important as choosing the right product. Always wash your hands before instilling drops, and never allow the dropper tip to touch your eye or any other surface, as this can introduce bacteria into the bottle.

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 / Allergic eye conditions
Active ingredient Sodium cromoglicate 2% w/v
Mechanism of action Mast cell stabiliser
Drug class Cromone / Mast cell stabiliser
Route of administration Ophthalmic (topical eye drops)
Preparation Aqueous eye drop solution
Pack size 10ml
Suitable for Adults and children aged 6 years and over
UK classification Pharmacy (P) medicine
Effective for Itchy, red, and watery 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 contain sodium cromoglicate 2% w/v, a mast cell stabiliser used to treat and prevent the symptoms of allergic conjunctivitis. Allergic conjunctivitis is an inflammation of the conjunctiva — the thin membrane covering the white of the eye and the inside of the eyelids — triggered by allergens such as pollen, dust mites, pet dander, and mould. Symptoms typically include itching, redness, watering, and a gritty or burning sensation in the eyes.

These allergy eye drops are classified as a Pharmacy (P) medicine in the UK, meaning they are available without a prescription but should be purchased from a registered pharmacy. They are suitable for adults and children aged 6 years and over. If you are unsure whether this product is right for you, speak to a pharmacist before use.

 

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

 

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

Do not use Optrex Allergy Eye Drops if you:

  • Are allergic to sodium cromoglicate or any other ingredient in the formulation
  • Are under 6 years of age
  • Have an eye infection — treat the infection first before using allergy drops
  • Are wearing soft (hydrophilic) contact lenses at the time of instillation

Speak to your pharmacist or GP before use if you:

  • Are pregnant or breastfeeding
  • Have glaucoma or any other diagnosed eye condition
  • Have recently had eye surgery
  • Experience worsening symptoms or no improvement after a few days of use

Drug interactions:

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

 

How Should You Use Optrex Allergy Eye Drops?

 

Using these drops correctly will help you get the most benefit. Follow these steps each time you apply them.

  1. Wash your hands thoroughly with soap and water before handling the bottle
  2. Remove soft contact lenses before instilling 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 above the eye and instil one to two drops into the pocket
  6. Close your eye gently for one to two minutes — do not blink forcefully
  7. Wipe away any excess liquid with a clean tissue
  8. Repeat in the other eye if required
  9. Replace the cap immediately after use
  10. 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 Under 6 years Not recommended Seek medical advice

For best results, use the drops regularly throughout the allergy season — even on days when your symptoms feel mild. Sodium cromoglicate works preventatively, so consistent use is key. You can find further guidance on managing seasonal symptoms in our allergy and hay fever collection.

 

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 — avoid driving or operating machinery until vision clears
  • Mild eye irritation or watering shortly after use

Less common side effects:

  • Redness of the eye or eyelid
  • Sensitivity to light (photophobia)
  • Dry eye sensation

If you experience severe eye pain, sudden changes in vision, significant swelling, or signs of an allergic reaction (such as rash, difficulty breathing, or swelling of the face), stop using the drops immediately and seek urgent medical attention. These reactions are rare but require prompt assessment.

 

How Should You Store Optrex Allergy Eye Drops?

 

Correct storage helps maintain the safety and effectiveness of the drops. Follow these instructions carefully.

  • Store below 25°C — do not refrigerate or freeze
  • Keep away from direct sunlight and heat sources
  • Keep the bottle tightly closed when not in use
  • Discard the bottle 28 days after first opening, even if liquid remains
  • Write the opening date on the bottle label as a reminder
  • Keep out of the sight and reach of children
  • Do not use after the expiry date printed on the bottle and carton

If you need additional eye care products or want to explore other options for managing eye-related symptoms, browse our full eye care range for more choices.

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 no prescription required. They are dispatched quickly and delivered directly to your door. Browse our full eye care collection for more options.

How do Optrex Allergy Eye Drops work in the eye?

The active ingredient, sodium cromoglicate 2%, works by stabilising mast cells in the conjunctival tissue, preventing them from releasing histamine and other inflammatory chemicals when exposed to allergens. This stops the allergic reaction before it causes itching, redness, and watering. Regular use throughout the allergy season gives the best results.

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

Wash your hands, tilt your head back, and gently pull down your lower eyelid to form a small pocket. Instil one to two drops into the pocket, close your eye gently for one to two minutes, and wipe away any excess with a clean tissue. Never let the dropper tip touch your eye or any surface.

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

The recommended dose is one to two 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 is more effective than using the drops only when symptoms flare.

Can I use Optrex Allergy Eye Drops with contact lenses?

No — you must remove soft (hydrophilic) contact lenses before instilling the drops. Wait at least 30 minutes after applying the drops before reinserting your lenses. Hard (rigid gas-permeable) lenses should also be removed; check with your optician if you are unsure.

Are Optrex Allergy Eye Drops suitable for children?

Yes, Optrex Allergy Eye Drops are suitable for children aged 6 years and over, using the same dose as adults — one to two drops per affected eye, four times daily. They should not be used in children under 6 years of age without specific medical advice from a GP or paediatrician.

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 instillation and temporary blurred vision. These are usually mild and pass within a few minutes. If you experience severe pain, significant redness, or sudden vision changes, stop using the drops and seek medical advice promptly.

How long can I use Optrex Allergy Eye Drops for?

You can use Optrex Allergy Eye Drops throughout your allergy season, which may last several weeks or months depending on your triggers. However, the opened bottle must be discarded after 28 days regardless of how much liquid remains. If symptoms persist beyond the allergy season or worsen, consult your GP.

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

If you miss a dose, simply apply the drops as soon as you remember — unless it is nearly time for your next scheduled dose, in which case skip the missed one and carry on as normal. Do not double up doses to compensate. Consistent daily use gives the best protection against allergic eye symptoms.

Can I use Optrex Allergy Eye Drops if I am pregnant or breastfeeding?

If you are pregnant or breastfeeding, you should speak to your GP or pharmacist before using Optrex Allergy Eye Drops. While topical sodium cromoglicate is minimally absorbed systemically, it is always best to seek professional advice before using any medicine during pregnancy or whilst nursing.

What are the alternatives to Optrex Allergy Eye Drops?

Alternatives include antihistamine eye drops such as ketotifen (e.g. Zaditen), which act more quickly but work differently by blocking histamine receptors rather than preventing its release. Oral antihistamines can also help with eye symptoms as part of broader hay fever management — explore our allergy and hay fever range for more options.

Do Optrex Allergy Eye Drops work for hay fever eyes?

Yes — allergic conjunctivitis caused by hay fever (pollen allergy) is one of the primary indications for these drops. Sodium cromoglicate prevents the mast cell response triggered by pollen, reducing itching, redness, and watering. Starting use a few days before peak pollen season can improve how well they work.

How should I store Optrex Allergy Eye Drops after opening?

Store the bottle below 25°C, away from direct sunlight and heat. Do not refrigerate. Once opened, discard the bottle after 28 days — even if liquid remains — to reduce the risk of contamination and eye infection. Write the opening date on the bottle so you can track this easily.

Can Optrex Allergy Eye Drops be used for dry eyes?

No — Optrex Allergy Eye Drops are specifically formulated to treat allergic conjunctivitis and are not intended for dry eye syndrome. Dry eyes require lubricating or artificial tear drops, which are a different type of product. If you are unsure which type of eye drop you need, speak to a pharmacist for guidance.

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

Sodium cromoglicate has been used as a topical ophthalmic treatment for allergic conjunctivitis for several decades and remains a recommended option in UK clinical guidelines. It is well tolerated, with a long safety record in both adults and children aged 6 and over. Current NHS and BNF guidance continues to support its use as a first-line or adjunct treatment for allergic eye conditions.

How Should You Use Optrex Allergy Eye Drops?

Using Optrex Allergy Eye Drops correctly makes a real difference to how well they work. Always wash your hands thoroughly before handling the bottle, and make sure you remove soft contact lenses before applying the drops. Never allow the dropper tip to touch your eye, eyelid, or any other surface, as this can contaminate the solution and increase the risk of infection.

Follow these steps each time you use the drops:

What Is the Correct Dose of Optrex Allergy Eye Drops?

The standard dose for adults and children aged 6 and over is one to two drops in each affected eye, four times daily. It is important to space doses evenly throughout the day to maintain consistent levels of the medicine in the eye. Do not use more than the recommended amount — using extra drops will not improve results and may cause unnecessary irritation.

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

Sodium cromoglicate works best as a preventative treatment rather than a rescue remedy. Ideally, start using the drops a few days before your allergy season begins — for example, before pollen counts rise in spring. This gives the medicine time to stabilise mast cells before allergen exposure occurs, which means you are less likely to experience a severe reaction when pollen levels peak.

During the allergy season, aim to use the drops at regular intervals throughout the day — for example, morning, midday, late afternoon, and evening. Try to use them at roughly the same times each day to maintain consistent protection. If you know you will be spending time outdoors when pollen counts are high, applying the drops beforehand can be particularly helpful.

How Long Can You Use Optrex Allergy Eye Drops For?

You can use Optrex Allergy Eye Drops throughout your allergy season, which may last several weeks or months depending on your specific triggers. However, once the bottle has been opened, it must be discarded after 28 days — regardless of how much liquid remains — to prevent contamination and reduce the risk of eye infection. If your symptoms continue beyond the expected allergy season, or if they worsen at any point, consult your GP or pharmacist for further assessment.

Do not exceed the recommended dose. If in doubt, speak to your pharmacist.

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

Most people who use Optrex Allergy Eye Drops tolerate them well, but some side effects can occur. The most frequently reported ones are localised to the eye and tend to be mild and short-lived. They do not usually require you to stop treatment.

  • Transient stinging or burning sensation immediately after instilling the drops
  • Temporary blurred vision lasting a few minutes after application
  • Mild watering of the eye shortly after use
  • A brief sensation of eye irritation or discomfort

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

Less commonly, some people may notice other effects in or around the eye. These are not experienced by the majority of users, but it is worth being aware of them so you can recognise them if they occur.

  • Redness of the eye or surrounding eyelid skin
  • Sensitivity to light (photophobia)
  • A dry or gritty sensation in the eye
  • Swelling of the eyelid

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

Serious side effects from topical sodium cromoglicate are rare, but they can happen. If you experience any of the following, stop using the drops immediately and seek urgent medical attention. Do not wait to see if the symptoms resolve on their own.

  • Severe eye pain or significant increase in eye redness
  • Sudden or marked change in vision
  • Signs of a serious allergic reaction — including rash, swelling of the face or throat, or difficulty breathing
  • Persistent or worsening eye symptoms despite regular use

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 needed — these typically resolve within a few minutes of instillation. Avoid driving or operating machinery until your vision has fully cleared after applying the drops. If side effects feel persistent or are affecting your daily life, speak to your pharmacist before continuing use.

If you suspect a serious reaction, stop using the drops straight away and contact your GP, call NHS 111, or go to your nearest A&E department if the reaction is severe. Always bring the product packaging with you so healthcare professionals can identify the ingredients quickly.

Can Optrex Allergy Eye Drops Interact With Other Medicines?

No clinically significant drug interactions have been reported for topical sodium cromoglicate at standard ophthalmic doses. However, if you are using other eye drops or eye ointments at the same time, leave a gap of at least 5 minutes between applications to prevent one product diluting or washing out the other. Eye ointments should generally be applied last. Always inform your pharmacist of all medicines — including over-the-counter products — that you are currently using, 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

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Content last updated: 31 Mar 2025

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