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Relief from symptoms will usually occur within 24 hours. If more than 72 hours have passed without symptom relief then an alternative diagnosis should be considered.
For best results, the drops should be used every day through your hay fever season. It is safe to use the drops for up to 4 months at a time without a break.
Allergic conjunctivitis is typically triggered by exposure to pollen from trees and flowers, or animal hair and pet dander. These allergens trigger cells within our immune system (mast cells) to release histamine, which leads to irritation.
Allergic conjunctivitis can be treated with anti-allergy drops, like Sodium Cromoglicate or Opatanol.
If you experience additional hay fever or allergy symptoms, such as an itchy throat or runny nose, antihistamine tablets can provide extra relief alongside eye drops.
Opatanol is a prescription-only eye drop used to treat allergic conjunctivitis (hay fever) by reducing the redness, itch, watering and irritation of the eyes associated with the condition.
Opatanol works by stabilising the mast cells that release histamine. It’s similar to Sodium Cromoglicate, but can be used less frequently (twice daily) as it provides more sustained relief of symptoms.
One drop should be instilled into each eye, twice daily.
Allergic conjunctivitis is the name given to eye inflammation caused by allergies, such as hay fever.
This inflammation causes itching, redness and watering. It can also lead to eye discharge, or inflamed, itchy eyelids.
Opatanol is well tolerated and side effects are not common. It can cause a feeling of dry eyes and irritation. Very rarely, it can cause an allergic reaction — if you experience this, you should avoid these drops in the future.
It is not suitable for women that are pregnant or breastfeeding.
Always read the patient information leaflet before commencing treatment.
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Checked properly by a doctor before medication was prescribed and aftercare very good. Received yesterday kept up to date with the delivery and had to sign for which I like so there’s no missing parcel. Highly recommended.
Trustworthy, professional and speedy delivery service. I have used this pharmacy a few times and I would recommend!

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Dr. Bryony Henderson joins HeliosX as Medical Director for the UK and US, bringing extensive clinical operations, governance, and digital health experience from Kry/Livi and Numan. A recognised clinical voice, she has contributed to award-winning campaigns, published on health inequalities, and appeared across major national media. At HeliosX, she leads clinical governance and quality and supports the delivery of safe, innovative, scalable care.

Adam is a doctor and advocate for increasing access to healthcare internationally. He has extensive experience in video consultations, technology-enabled examinations, remote biomarker testing, and education. He is a published author and has medical licenses in the UK, Spain and Republic of Ireland.

Consultant GP and Quality Lead
MBBS, BSc, MRCGP, DRCOG, PGDip Clinical Dermatology
Safia is a GP with experience working in the NHS with a particular interest in diabetes and weight loss management. She is passionate about the power of digital healthcare and oversees our approach to patient safety and regulatory compliance.

Declan is a pharmacist with 15 years of experience and is passionate about digital healthcare. He has extensive experience across all pharmacy sectors in the UK and Ireland. He has led the clinical and regulatory functions of some of the biggest pharmacy organisations in the UK and is excited about the future of the industry.