Skip to product information
1 of 1

  • Images are for illustration purposes only

Catacrom 2% Eye Drops 30 x 0.3ml

Catacrom 2% Eye Drops 30 x 0.3ml

  • 1. Ozempic®️-equivalent therapy now available for weight management
  • 2. Average weight loss of 17%, with 1 in 3 patients achieving over 20%
  • 3. May help reduce osteoarthritis-related pain
  • 4. Wegovy®️ is not expected to impact the effectiveness of oral contraceptives
  • 5. Supports cardiovascular risk reduction
  • 6. Over 22 million patients treated with semaglutide-based therapies since 2018

  • ✔️ Relieves itchy, red, watery eyes caused by allergies
  • ✔️ Contains 2% sodium cromoglicate, a clinically proven mast cell stabiliser
  • ✔️ Preservative-free unit dose vials — ideal for sensitive eyes
  • ✔️ Suitable for adults and children aged 6 years and over
  • ✔️ 30 single-use vials provide consistent allergy season coverage

Price Checker

Regular price £15.39
Sale price £15.39
Sale Sold out
  • Lowest price guarantee
  • Includes FREE private prescription
View full details

 

What Are Sodium Cromoglicate Eye Drops?

 

If your eyes itch, water, and turn red every time pollen season arrives — or whenever you're around cats, dust, or other allergens — you'll know just how disruptive allergic conjunctivitis can be. Catacrom 2% Eye Drops offer a clinically established way to manage those symptoms. Each pack contains 30 individual 0.3ml unit dose vials, making them hygienic, portable, and preservative-free. You can browse the full range of products for eye-related conditions in our eye care collection.

The active ingredient is sodium cromoglicate eye drops at a 2% concentration — a well-recognised mast cell stabiliser used in the UK for decades to prevent and relieve the symptoms of allergic conjunctivitis. Because each vial is single-use, there's no risk of preservative build-up on the ocular surface, which is particularly helpful if your eyes are already sensitive.

 

How Do Catacrom 2% Eye Drops Work?

 

Sodium cromoglicate works by stabilising mast cells in the conjunctival tissue. When you're exposed to an allergen — pollen, pet dander, dust mites — your immune system triggers mast cells to release histamine and other inflammatory mediators. It's those chemicals that cause the itching, redness, and watering. Catacrom interrupts that process before it starts.

  • Sodium cromoglicate binds to mast cell membranes in the conjunctiva.
  • It prevents calcium ion influx, which is needed to trigger degranulation.
  • Without degranulation, histamine and prostaglandins are not released.
  • Allergic symptoms are therefore reduced or prevented altogether.

It's worth noting that this is a preventative mechanism rather than an instant-relief one. Regular, consistent use — ideally starting before your allergy season — gives the best results.

 

Who Should Use Catacrom 2% Eye Drops?

 

These drops are suitable for adults and children aged 6 years and over who experience allergic conjunctivitis. Whether your symptoms are seasonal (triggered by pollen) or perennial (triggered year-round by dust mites or pet hair), sodium cromoglicate eye drops can help manage the ocular component of your allergy. If you also suffer from nasal symptoms, it may be worth exploring our allergy and hay fever collection for complementary treatments.

  • Adults with seasonal or perennial allergic conjunctivitis
  • Children aged 6 and over (under medical supervision for younger children)
  • People who prefer preservative-free eye drops
  • Those who want a preventative approach to managing eye allergy symptoms

 

How Does Catacrom Compare to Other Allergy Eye Drops?

 

Feature Catacrom 2% Eye Drops Antihistamine Eye Drops (e.g. Ketotifen)
Active ingredient Sodium cromoglicate 2% Ketotifen 0.025% or antazoline
Mechanism Mast cell stabiliser (preventative) Antihistamine (symptomatic relief)
Onset of action Several days of regular use Faster, often within minutes
Preservative-free Yes (unit dose vials) Varies by product

 

How Should You Store Catacrom 2% Eye Drops?

 

Store Catacrom 2% Eye Drops below 25°C, away from direct sunlight and out of reach of children. Because each vial is a single-use unit dose, you must discard it immediately after use — even if some liquid remains. Do not use the drops after the expiry date printed on the packaging.

These drops do not contain preservatives, which is precisely why the single-use format is so important. Once opened, the sterility of the solution cannot be guaranteed. If you're unsure whether this product is right for you, speak to a pharmacist before purchasing.

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.

Catacrom 2% Eye Drops 30 x 0.3ml specifications
Treatment category Allergic conjunctivitis / Eye allergy
Active ingredient Sodium cromoglicate 2% w/v
Mechanism of action Mast cell stabiliser
Strengths 2%
Pack sizes 30 x 0.3ml unit dose vials
Preparation Sterile eye drops solution (preservative-free)
Route of administration Ophthalmic (topical to the eye)
UK classification P (Pharmacy medicine)
Drug class Mast cell stabiliser / Anti-allergic
Suitable for Adults and children aged 6 years and over
Effective for Seasonal and perennial allergic conjunctivitis

Specifications of Catacrom 2% Eye Drops 30 x 0.3ml

 

What Is Catacrom 2% and What Is It Used For?

 

Catacrom 2% Eye Drops contain sodium cromoglicate, 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 inner eyelids — triggered by allergens such as pollen, dust mites, mould spores, or animal dander. Symptoms typically include itching, redness, watering, and a gritty or burning sensation in the eyes.

Each preservative-free unit dose vial delivers a precise 0.3ml of 2% sodium cromoglicate solution directly to the eye. The drops are used both to prevent symptoms before allergen exposure and to manage ongoing allergic eye symptoms during the allergy season.

 

What Do You Need to Know Before Using Catacrom 2%?

 

Before using these drops, read the following carefully. Not everyone is suitable for this product, and certain conditions or medicines may affect whether it's appropriate for you.

Do not use Catacrom 2% Eye Drops if you:

  • Are allergic to sodium cromoglicate or any other ingredient in the formulation
  • Are wearing soft contact lenses at the time of instillation
  • Have been advised by a doctor to avoid this type of medicine

Take care and speak to a pharmacist or GP if you:

  • Have any eye infection or injury — treat the infection first before using allergy drops
  • Are pregnant or breastfeeding — seek medical advice before use
  • Are using any other eye drops or eye ointments at the same time
  • Experience worsening symptoms, eye pain, or changes in vision

Drug interactions:

  • No clinically significant interactions with systemic medicines have been reported for topical sodium cromoglicate
  • If using other eye drops, allow at least 5 minutes between instillations to avoid dilution of either product

 

How Should You Use Catacrom 2% Eye Drops?

 

Always use Catacrom 2% Eye Drops exactly as directed on the packaging or as advised by your pharmacist. Do not exceed the recommended dose. Each vial is for single use only — discard it immediately after use, even if solution remains.

  1. Wash your hands thoroughly before handling the vial.
  2. Twist off the top of the unit dose vial carefully.
  3. Tilt your head back and gently pull down your lower eyelid to create a small pocket.
  4. Hold the vial over the eye and squeeze gently to instil one to two drops.
  5. Close your eye gently for one to two minutes. Avoid blinking excessively.
  6. If using in both eyes, repeat the process for the other eye using the same vial.
  7. Discard the vial immediately after use.
Indication Age Group Dose Frequency
Allergic conjunctivitis Adults 1–2 drops per eye 4 times daily
Allergic conjunctivitis Children (6 years and over) 1–2 drops per eye 4 times daily
Allergic conjunctivitis Children under 6 Not recommended without medical advice

 

What Are the Possible Side Effects of Catacrom 2%?

 

Like all medicines, Catacrom 2% 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 until vision clears)
  • Mild eye irritation

Less common side effects:

  • Watering of the eyes
  • Redness of the conjunctiva
  • Eyelid itching or swelling

Stop using the drops and seek medical advice promptly if you experience severe eye pain, significant swelling around the eye, or any sudden change in vision. These could indicate a more serious reaction. If you're managing multiple eye conditions, it's worth speaking to your GP or optometrist. You can also explore our wider eye care range for complementary products.

 

How Should You Store Catacrom 2% Eye Drops?

 

  • Store below 25°C in a dry place, away from direct sunlight and heat
  • Keep out of the sight and reach of children
  • Do not use after the expiry date printed on the carton or vial
  • Do not freeze
  • Discard each unit dose vial immediately after use — do not save opened vials
  • Do not dispose of medicines via wastewater or household waste — ask your pharmacist how to dispose of medicines you no longer need

If you suffer from both eye and nasal allergy symptoms during hay fever season, you may find it helpful to combine these drops with other treatments. Our allergy and hay fever collection includes a range of options to help manage symptoms across different areas.

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 Catacrom 2% Eye Drops online in the UK?

You can buy Catacrom 2% Eye Drops directly from Cured Pharmacy, a GPhC-registered UK online pharmacy. They are available without a prescription as an over-the-counter medicine. Browse our full eye care collection for the complete range of eye health products we stock.

How do sodium cromoglicate eye drops work in the body?

Sodium cromoglicate stabilises mast cells in the conjunctival tissue, preventing them from releasing histamine and other inflammatory chemicals when you're exposed to an allergen. This stops the allergic cascade before it causes itching, redness, and watering. It works best as a preventative treatment used consistently throughout the allergy season.

How do I use Catacrom 2% Eye Drops step by step?

Wash your hands, twist off the top of the unit dose vial, tilt your head back, and gently pull down your lower eyelid. Squeeze one to two drops into the eye, close it gently for a minute or two, then discard the vial immediately. Repeat in the other eye if needed, using the same vial before discarding.

What is the correct dose of Catacrom 2% Eye Drops?

The standard dose for adults and children aged 6 and over is one to two drops instilled into each affected eye, four times daily. Space the doses evenly throughout the day for consistent symptom control. Do not exceed this dose unless directed by a healthcare professional.

How long does it take for Catacrom 2% Eye Drops to work?

Catacrom 2% Eye Drops typically require several days of regular use before you notice a meaningful improvement in symptoms. For seasonal allergies, it's advisable to start using them a week or two before your expected allergen exposure. Consistent daily use is key — skipping doses reduces effectiveness.

Can children use Catacrom 2% Eye Drops?

Yes, Catacrom 2% Eye Drops are suitable for children aged 6 years and over at the same dose as adults — one to two drops per eye, four times daily. For children under 6, you should seek advice from a GP or paediatrician before use. Always supervise children when applying eye drops.

Can I wear contact lenses while using Catacrom 2% Eye Drops?

You should remove soft contact lenses before instilling Catacrom 2% Eye Drops and wait at least 15 minutes before reinserting them. Hard (rigid gas-permeable) lenses should also be removed prior to use. Wearing lenses during instillation may affect the efficacy of the drops and could cause lens discolouration.

What are the side effects of Catacrom 2% 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 resolve within a few minutes. If you experience severe eye pain, significant swelling, or worsening redness, stop using the drops and consult a pharmacist or GP.

What happens if I miss a dose of Catacrom 2% Eye Drops?

If you miss a dose, apply the drops as soon as you remember — unless it's nearly time for your next scheduled dose, in which case simply skip the missed one. Do not double up doses to compensate. Consistent use is important for this medicine to work effectively, so try to stick to your regular schedule.

Are Catacrom 2% Eye Drops safe to use during pregnancy?

If you are pregnant or breastfeeding, you should seek advice from your GP or pharmacist before using Catacrom 2% Eye Drops. While topical sodium cromoglicate has limited systemic absorption, it is always best to confirm suitability with a healthcare professional during pregnancy. Do not self-medicate without guidance.

How do Catacrom 2% Eye Drops compare to antihistamine eye drops?

Catacrom 2% contains sodium cromoglicate, which works preventatively by stabilising mast cells, whereas antihistamine eye drops (such as those containing ketotifen) block histamine receptors and may provide faster but shorter-term relief. Catacrom is better suited to people who want to prevent symptoms throughout the allergy season rather than treat them reactively.

Who is eligible to use Catacrom 2% Eye Drops?

These drops are suitable for adults and children aged 6 and over who have been diagnosed with or experience symptoms consistent with allergic conjunctivitis. They are not suitable for people with known hypersensitivity to sodium cromoglicate. If you have an active eye infection or injury, treat that condition first before starting allergy drops.

How long can you use Catacrom 2% Eye Drops for?

Catacrom 2% Eye Drops can be used throughout the allergy season, which may last several weeks or months depending on your triggers. If you have perennial allergic conjunctivitis, longer-term use may be appropriate under the guidance of a GP or optometrist. If symptoms persist beyond a few weeks without improvement, seek a medical review.

What are the alternatives to Catacrom 2% Eye Drops?

Alternatives include antihistamine eye drops (e.g. ketotifen or antazoline), or combination products containing both an antihistamine and a decongestant. For broader allergy management — including nasal and skin symptoms — you might also explore our allergy and hay fever collection. Your pharmacist can help you choose the most appropriate option for your specific symptoms.

What does the latest research say about sodium cromoglicate eye drops?

Sodium cromoglicate has been used clinically for allergic conjunctivitis for several decades and remains a well-established, evidence-based treatment option. Published clinical literature consistently supports its efficacy as a mast cell stabiliser for seasonal and perennial allergic eye disease. It continues to be recommended in UK clinical guidelines for the management of ocular allergy symptoms.

How Should You Use Catacrom 2% Eye Drops?

Using Catacrom 2% Eye Drops correctly is important for both safety and effectiveness. Always wash your hands thoroughly before handling the vials, and never touch the tip of the vial to your eye or any other surface to avoid contamination.

What Is the Correct Dose of Catacrom 2% Eye Drops?

The recommended dose is one to two drops per affected eye, four times daily. Space your doses evenly throughout the day — for example, morning, midday, late afternoon, and evening — to maintain consistent levels of protection. Do not use more than directed.

When Is the Best Time to Use Catacrom 2% Eye Drops?

Because sodium cromoglicate works preventatively rather than reactively, the best time to start using these drops is before your allergy symptoms begin — ideally one to two weeks before your expected allergen exposure, such as the start of the pollen season. Once you've started, use them consistently at evenly spaced intervals throughout the day. If you also use other eye drops, wait at least five minutes between applications to avoid diluting either product.

How Long Can You Use Catacrom 2% Eye Drops For?

You can use Catacrom 2% Eye Drops throughout your allergy season, which may span several weeks or months depending on your specific triggers. For perennial allergic conjunctivitis — where symptoms occur year-round — longer-term use may be appropriate, but it's advisable to review this with your GP or optometrist periodically. If your symptoms have not improved after a few weeks of regular use, seek medical advice rather than continuing without reassessment.

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

Customer Reviews

Based on 1 review
100%
(1)
0%
(0)
0%
(0)
0%
(0)
0%
(0)
F
Fay

Arrived promptly and good

What Are the Most Common Side Effects of Catacrom 2% Eye Drops?

Most people tolerate Catacrom 2% Eye Drops well, but some do experience mild, localised side effects — particularly when first starting treatment. These are usually short-lived and resolve on their own within a few minutes of instillation.

  • Transient stinging or burning sensation in the eye immediately after applying the drops
  • Temporary blurred vision — avoid driving or operating machinery until your vision clears
  • Mild eye irritation or discomfort

What Are the Less Common Side Effects of Catacrom 2% Eye Drops?

Less frequently, some people may notice additional eye-related reactions. These are not dangerous in most cases, but you should monitor them and speak to a pharmacist if they persist or worsen.

  • Increased watering of the eyes
  • Redness of the conjunctiva (the white of the eye)
  • Itching or swelling of the eyelids
  • A sensation of something in the eye

What Are the Serious Side Effects of Catacrom 2% Eye Drops?

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

  • Severe eye pain that does not resolve quickly
  • Significant swelling around the eye or eyelids
  • Sudden or persistent changes in vision
  • Signs of a hypersensitivity reaction, such as facial swelling, difficulty breathing, or a widespread rash

What Should You Do If You Experience Side Effects?

If you notice mild side effects such as brief stinging or temporary blurring, these are expected and generally not a cause for concern. Simply wait a few minutes and they should pass. If side effects are persistent, worsening, or affecting your daily life, stop using the drops and speak to your pharmacist or GP. You can also report suspected side effects directly to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk.

Can Catacrom 2% Eye Drops Interact With Other Medicines?

No clinically significant interactions between topical sodium cromoglicate and systemic medicines have been reported. However, if you are using other eye drops or eye ointments at the same time, allow at least five minutes between applications to prevent one product diluting or washing out the other. Always inform your pharmacist of all medicines you are currently using, including over-the-counter products and supplements.

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

We’re a safe and
regulated UK service

Registered Pharmacy Badge

Lowest Price Guarantee

We're convinced you won't find your treatment cheaper, but if you do we'll refund the difference.

Find out more

100% discreet packaging

We're convinced you won't find your treatment cheaper, but if you do we'll refund the difference.

Find out more

Agent

Need help?
Talk to our friendly experts now

How our service works

Service Setup

Service setup

Discreet Packaging

Discreet packaging

Express Delivery

Express delivery