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Optilast Eye Drops (8ml)

Optilast Eye Drops (8ml)

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  • ✔️ Relieves itching, redness, and watering caused by eye allergies
  • ✔️ Targets allergic conjunctivitis directly in the eye with azelastine
  • ✔️ Twice-daily dosing keeps allergy symptoms controlled all day
  • ✔️ Suitable for adults and children aged four years and over
  • ✔️ Non-drowsy formula — no systemic antihistamine side effects

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What Are Optilast Eye Drops and How Do They Help?

 

If your eyes are constantly itching, watering, or looking red during hay fever season, you are far from alone. Allergic conjunctivitis affects millions of people in the UK every year, and finding something that actually works — quickly — can feel like a challenge. Optilast eye drops contain azelastine hydrochloride 0.05%, a topical antihistamine applied directly to the eye to target the source of the problem rather than relying on a tablet to work its way through your system. Each 8ml bottle is compact enough to carry in a bag or keep at your desk, making it easy to manage symptoms wherever you are. You can explore the full range of eye care products at Cured Pharmacy if you need additional support alongside these drops.

Allergic conjunctivitis occurs when the immune system overreacts to airborne allergens such as pollen, pet dander, or dust mites. The result? Histamine floods the tissues around your eyes, causing that familiar burning, itching, and watering. Optilast eye drops are clinically indicated for the treatment of seasonal and perennial allergic conjunctivitis in adults and children aged 4 years and over.

 

How Do Optilast Eye Drops Work in the Eye?

 

Azelastine hydrochloride works by blocking histamine H1 receptors in the conjunctival tissue — the thin membrane lining the inside of your eyelids and covering the white of your eye. When allergens trigger mast cells to release histamine, azelastine is already there to intercept it. The mechanism is local and targeted, which means relief tends to be felt relatively quickly after instillation.

  • Azelastine binds to H1 histamine receptors in the conjunctiva
  • Prevents histamine from triggering the itch-inflammation cascade
  • Also has some mast cell stabilising properties, reducing further histamine release
  • Acts locally in the eye, minimising systemic absorption and drowsiness

 

Who Should Use Optilast Eye Drops?

 

These drops are suitable for a wide range of people dealing with eye allergy symptoms. Whether your symptoms are seasonal — triggered by tree or grass pollen — or year-round due to dust mites or animal hair, Optilast eye drops can help manage the discomfort. They are particularly useful for people who find oral antihistamines cause drowsiness or who want targeted relief without taking a tablet.

  • Adults and children aged 4 years and over with allergic conjunctivitis
  • People with seasonal hay fever affecting the eyes
  • Those with perennial (year-round) eye allergy symptoms
  • Individuals who prefer a non-drowsy, localised treatment option

 

How Do Optilast Eye Drops Compare to Other Allergy Eye Drops?

 

Feature Optilast Eye Drops (Azelastine) Sodium Cromoglicate Eye Drops
Drug class Antihistamine (H1 blocker) Mast cell stabiliser
Onset of action Relatively rapid (symptomatic relief) Slower — requires regular preventative use
Dosing frequency Twice daily Four times daily
Suitable age 4 years and over Generally 6 years and over (varies by brand)

 

How Should You Store Optilast Eye Drops and Are They Clinically Suitable for You?

 

Store your bottle below 25°C, away from direct sunlight. Once opened, Optilast eye drops should be discarded after 4 weeks — even if there is solution remaining — to reduce the risk of eye infection from a contaminated bottle. Do not freeze. Keep out of reach of children. If you wear soft contact lenses, remove them before applying the drops and wait at least 15 minutes before reinserting. You can also browse allergy and hay fever treatments at Cured Pharmacy if you need a broader approach to managing your symptoms this season.

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.

Optilast Eye Drops (8ml) specifications
Treatment category Allergic conjunctivitis / Eye allergy relief
Active ingredient Azelastine hydrochloride 0.05% (0.5 mg/ml)
Mechanism of action Histamine H1 receptor antagonist (topical antihistamine)
Drug class Antihistamine
Preparation Sterile aqueous eye drops solution
Route of administration Ophthalmic (topical, into the eye)
Pack size 8ml
Suitable for Adults and children aged 4 years and over
UK classification POM (Prescription Only Medicine) — available via registered online pharmacy
Effective for Seasonal and perennial allergic conjunctivitis

Specifications of Optilast Eye Drops (8ml)

 

What Is Optilast and What Is It Used For?

 

Optilast eye drops contain azelastine hydrochloride 0.05%, a topical antihistamine used to treat the symptoms of allergic conjunctivitis. This includes the itching, redness, swelling, and watering of the eyes that occur when your immune system reacts to allergens such as pollen, dust mites, or animal dander. The drops are applied directly to the eye, providing localised relief without the systemic effects associated with oral antihistamines. They are suitable for adults and children aged 4 years and over.

 

What Do You Need to Know Before Using Optilast?

 

Before using these drops, it is important to check whether they are appropriate for you. Read the following carefully.

Do not use Optilast if you:

  • Are allergic to azelastine hydrochloride or any other ingredient in the formulation
  • Are under 4 years of age
  • Have an active eye infection (bacterial, viral, or fungal) — treat the infection first

Take special care and speak to your pharmacist or GP if you:

  • Are pregnant or breastfeeding — use only if clearly necessary and on medical advice
  • Wear soft contact lenses — remove before use and wait 15 minutes before reinserting
  • Have any other eye condition or are using other eye drops or ointments

Known drug interactions:

  • No clinically significant interactions are known at ophthalmic doses
  • If using other eye drops, leave at least 5 minutes between applications
  • If using eye ointments, apply Optilast first and wait at least 15 minutes before the ointment

 

How Should You Use Optilast Eye Drops?

 

Always use Optilast exactly as directed. If you are unsure about anything, check with your pharmacist. The drops are for use in the eye only — never swallow them.

  1. Wash your hands thoroughly before handling the bottle
  2. If wearing soft contact lenses, remove them before applying the drops
  3. Tilt your head back and gently pull down your lower eyelid to create a small pocket
  4. Hold the bottle above the eye and instil one drop into the pocket
  5. Close your eye gently and press lightly on the inner corner (near the nose) for about one minute — this reduces drainage into the nasal passage
  6. Repeat in the other eye if both are affected
  7. Replace the cap immediately after use
  8. Wait at least 15 minutes before reinserting contact lenses
Indication Age Group Dose Frequency
Seasonal allergic conjunctivitis Adults & children ≥4 years 1 drop per affected eye Twice daily
Perennial allergic conjunctivitis Adults & children ≥4 years 1 drop per affected eye Twice daily
Children under 4 years Under 4 years Not recommended

If you are managing a broader range of hay fever symptoms alongside your eye symptoms, it may be worth looking at ear, nose, and throat treatments to address nasal congestion and sneezing at the same time.

 

What Are the Possible Side Effects of Optilast?

 

Like all medicines, Optilast can cause side effects, although not everyone experiences them. Most side effects are mild and occur at the site of application.

Common side effects (may affect up to 1 in 10 people):

  • Transient stinging or burning sensation immediately after instillation
  • Bitter or unpleasant taste (caused by drainage through the tear duct into the throat)
  • Mild eye irritation

Less common side effects (may affect up to 1 in 100 people):

  • Blurred vision immediately after application (usually clears within a few minutes)
  • Dry eye sensation
  • Headache
  • Eye discharge or crusting around the eyelid

If you experience severe eye pain, sudden vision changes, or signs of an eye infection (increased redness, discharge, swelling), stop using the drops and seek medical advice promptly. You can also find additional support through our allergy and hay fever collection if you need complementary treatments.

 

How Should You Store Optilast Eye Drops?

 

  • 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 4 weeks after first opening, even if solution remains
  • Keep out of the sight and reach of children
  • Do not use after the expiry date printed on the label
  • Do not use if the solution appears discoloured or cloudy

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 Optilast eye drops online in the UK?

You can buy Optilast eye drops online from Cured Pharmacy, a GPhC-registered online pharmacy operating in the UK. Simply add the 8ml bottle to your basket and complete a brief health questionnaire before checkout. Our dispensing team reviews every order to ensure the product is appropriate for you before it is dispatched.

How do Optilast eye drops work in the eye?

Optilast eye drops contain azelastine hydrochloride, which blocks histamine H1 receptors in the conjunctival tissue of the eye. When allergens trigger mast cells to release histamine, azelastine prevents it from binding and causing the itch-inflammation response. The drops also have some mast cell stabilising activity, which may help reduce further histamine release over time.

How do I use Optilast eye drops step by step?

Wash your hands, remove any soft contact lenses, and tilt your head back. Gently pull down your lower eyelid and instil one drop into the pocket formed. Close your eye and press lightly on the inner corner for about one minute to reduce drainage into the throat. Repeat in the other eye if needed, then wait 15 minutes before reinserting contact lenses.

What is the correct dose of Optilast eye drops for adults?

The recommended dose for adults is one drop into each affected eye, twice daily. You should use the drops consistently throughout your allergy season for the best results. Do not increase the dose without speaking to your pharmacist or GP first.

What is the best time to use Optilast eye drops?

There is no single fixed time, but many people find it helpful to use one dose in the morning and one in the evening to maintain consistent symptom control throughout the day. If you know you will be exposed to a specific allergen — such as going outdoors during high pollen counts — applying the drops beforehand may help. Consistency matters more than the exact time of day.

What are the side effects of Optilast eye drops and how do I manage them?

The most common side effects are a brief stinging or burning sensation immediately after instillation and a bitter taste caused by drainage through the tear duct. Pressing gently on the inner corner of your eye for one minute after applying the drop can significantly reduce the bitter taste. If stinging persists or worsens, stop using the drops and speak to your pharmacist.

Can I use Optilast eye drops with contact lenses?

You must remove soft contact lenses before applying Optilast eye drops and wait at least 15 minutes before reinserting them. This is because the preservative in the drops (benzalkonium chloride) can be absorbed by soft lens material and may cause eye irritation. Hard (rigid gas-permeable) lenses should also be removed prior to use.

Are Optilast eye drops suitable for children?

Optilast eye drops are suitable for children aged 4 years and over, using the same dose as adults — one drop per affected eye twice daily. They are not recommended for children under 4 years of age. If you are unsure whether these drops are appropriate for your child, speak to your GP or pharmacist before use. You can also browse our allergy and hay fever range for age-appropriate alternatives.

What happens if I miss a dose of Optilast eye drops?

If you miss a dose, simply apply it 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 apply two drops at once to make up for a missed dose. Missing the occasional dose is unlikely to significantly affect your symptom control.

How long can you use Optilast eye drops for?

You can use Optilast eye drops throughout your allergy season, but the bottle must be discarded 4 weeks after first opening regardless of how much solution remains. Using an opened bottle beyond 4 weeks increases the risk of contamination and eye infection. If your symptoms persist beyond 6 weeks or worsen, consult your GP for further assessment.

What are the alternatives to Optilast eye drops for allergic conjunctivitis?

Common alternatives include sodium cromoglicate eye drops (a mast cell stabiliser that works preventatively), ketotifen eye drops (another antihistamine), and olopatadine eye drops. Oral antihistamines such as cetirizine or loratadine can also help with eye symptoms as part of broader hay fever management. Your pharmacist can help you choose the most suitable option based on your symptoms and lifestyle. You can also explore our eye care collection for further options.

Can I use Optilast eye drops if I am pregnant or breastfeeding?

The safety of azelastine eye drops during pregnancy and breastfeeding has not been fully established in clinical studies. You should only use Optilast during pregnancy or whilst breastfeeding if your doctor or pharmacist has assessed that the benefit clearly outweighs any potential risk. Always disclose your pregnancy or breastfeeding status before purchasing any medicine online.

Do Optilast eye drops cause drowsiness?

Because azelastine is applied topically to the eye rather than taken orally, systemic absorption is minimal and drowsiness is not a recognised side effect of Optilast eye drops. This makes them a practical option for people who need to drive, operate machinery, or remain alert during the day. However, if you notice any unexpected drowsiness, stop using the drops and seek advice.

How quickly do Optilast eye drops start to work?

Many people notice a reduction in itching and irritation relatively quickly after applying Optilast eye drops, as the antihistamine acts locally at the site of the allergic reaction. Full symptom control tends to improve with regular twice-daily use over the first few days. If you see no improvement after one week of consistent use, speak to your pharmacist or GP.

What are the latest findings on azelastine eye drops for allergy?

Azelastine hydrochloride has been used clinically for allergic conjunctivitis for many years and remains a well-established treatment option supported by published clinical evidence. Studies have consistently shown it to be effective at reducing the key symptoms of allergic conjunctivitis — itching, redness, and tearing — with a good tolerability profile. The NHS and BNF continue to recognise azelastine as an appropriate topical antihistamine for this indication.

How Should You Use Optilast Eye Drops?

Using Optilast eye drops correctly makes a real difference to how well they work. Always read the label before use and follow these steps carefully to avoid contaminating the bottle or irritating your eye.

If you accidentally apply too many drops, rinse your eye gently with clean water. If you are using other eye drops at the same time, leave at least 5 minutes between each product.

What Is the Correct Dose of Optilast Eye Drops?

The dose is the same for all eligible patients — one drop per affected eye, twice daily. Do not apply more than one drop per eye per dose, as this does not improve efficacy and may increase the risk of side effects such as stinging or blurred vision.

When Is the Best Time to Use Optilast Eye Drops?

Most people find it easiest to apply one dose in the morning and one in the evening, spacing the two applications roughly 12 hours apart. If you know you will be exposed to a specific allergen — for example, spending time outdoors during a high pollen day — applying your morning dose before going outside may help reduce the severity of your reaction. Consistency is key; try to use the drops at the same times each day to maintain steady symptom control.

How Long Can You Use Optilast Eye Drops For?

Optilast eye drops can be used throughout your allergy season, whether that is a few weeks during the grass pollen season or longer for year-round perennial allergies. However, once you open the bottle, you must discard it after 4 weeks — even if solution remains — to prevent the risk of eye infection from a contaminated bottle. If your symptoms have not improved after one week of regular use, or if they worsen at any point, stop using the drops and speak to your pharmacist or GP. Long-term use beyond one season should be reviewed by a healthcare professional.

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 Optilast Eye Drops?

Most people tolerate Optilast eye drops well, but some do experience mild side effects, particularly when they first start using them. The most frequently reported effects are local — meaning they occur at or near the site of application — and tend to be short-lived.

  • Transient stinging or burning sensation immediately after instillation
  • Bitter or unpleasant taste (caused by the drops draining through the tear duct into the back of the throat)
  • Mild eye irritation or discomfort

Pressing gently on the inner corner of your eye for about one minute after applying the drop can significantly reduce the bitter taste by slowing drainage into the nasal passage.

What Are the Less Common Side Effects of Optilast Eye Drops?

Less common side effects occur in fewer people but are still worth being aware of. If any of the following persist or bother you, speak to your pharmacist.

  • Temporary blurred vision immediately after application — avoid driving until your vision clears
  • Dry eye sensation
  • Headache
  • Eye discharge or crusting around the eyelid
  • Increased sensitivity to light (photophobia)

What Are the Serious Side Effects of Optilast Eye Drops?

Serious side effects are rare with topical azelastine eye drops, but you should be aware of the signs that warrant prompt medical attention. If you experience any of the following, stop using the drops immediately and seek medical advice.

  • Sudden or significant worsening of eye redness, pain, or swelling
  • Purulent (pus-like) discharge from the eye — this may indicate a bacterial infection requiring separate treatment
  • Severe allergic reaction: swelling of the face, lips, or throat, difficulty breathing, or widespread skin rash
  • Significant or persistent vision changes

What Should You Do If You Experience Side Effects?

For mild side effects such as stinging or bitter taste, no specific action is usually needed — these typically resolve within a minute or two of application. If side effects are persistent, worsening, or affecting your quality of life, stop using the drops and consult 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. Never ignore a side effect that feels unusual or severe.

Can Optilast Eye Drops Interact With Other Medicines?

No clinically significant drug interactions have been identified with azelastine eye drops at the doses used ophthalmically. However, if you are using other eye drops or eye ointments at the same time, you should leave at least 5 minutes between applying each product. If using an eye ointment, apply Optilast first and wait at least 15 minutes before the ointment, as ointments can dilute or wash out drops applied afterwards. Always tell your pharmacist about all medicines you are currently using, including over-the-counter products.

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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