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Antihistamines / Allergy

Our antihistamines/allergy class of eye medications are used to treat allergic eye condition like conjunctivitis caused by seasonal allergies like hay fever or perennial allergies like allergy to animal dander, to relieve symptoms.

Use the search feature to quickly find the product you are looking for, by entering either the active ingredient, e.g. olopatadine or the product name, e.g. Patanol

Allergic conjunctivitis

Allergic conjunctivitis is inflammation of the conjunctiva, which is the inner lining of the eyelids and sclera of the eye (white part of the eye). It is caused by an allergic reaction to allergens such as pollen, animal dander or house dust mites with symptoms including swollen red eyes, itching and eye watering.

Antihistamine eye drops

Eye drops containing the antihistamine olopatadine, can be used to relieve symptoms of allergic conjunctivitis. Olopatadine works by binding to the H1 receptor on the conjunctival cells in the eye and this blocks the action of histamine, which is released by mast cells during an allergic reaction and is responsible for most of the symptoms of allergic conjunctivitis.
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Customer Review

Hear from more than 1000 happy customers!
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"I'll definitely be ordering from you again. Communication is super, better than any other company. Ordering was super easy. Thanks again. Gloria"
Gloria Bach NY, USA • April 2026
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"Thank you. I received my first shipment last week and I am very happy with the whole ordering experience and results."
Katherine FL, USA • November 2024
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"Ordered from you many years ago at your old website. Was very satisfied with your service then. Found you when I downloaded my bookmarks to a newer laptop. Put you in my favourite category."
Robert Lypka NC, USA • June 2025
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"I have been a customer for so long I can't remember when I signed up and it was over 10 years ago. I have been nothing but PLEASED with the service you provide. Here in the US people in my neighbourhood are crying for a decent pharmacy I've mentioned Inhousepharmacy.vu to these folks on a neighbourhood service."
Victor Riggan TX, USA • August 2025
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"I've been an Inhouse customer for over 20 years. Exemplary customer service and very responsive if you have any questions or need any assistance with your orders!"
Dave MI, USA • May 2026
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"I just received the inhalers and see that they don’t expire until next November, which is excellent! I really wanted to thank you again for all of your help and excellent customer service through this all. I’m sure it was a stressful time for your company as well. We will always continue ordering through your company."
Brooke Loffredo NJ,USA • October 2025
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"Inhouse Pharmacy are great. So reliable and a great range of products. Keep at it!"
Philip Honey UK • September 2025
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"As a satisfied customer of Inhouse Pharmacy for many years now, for both pet meds and personal use, I can confirm that the service provided is exemplary. From helpful people when I have queries, to efficient ordering and fast delivery (my most recent order arrived in the UK in a week), I'm more than happy to recommend them."
Jane UK • May 2026
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"Order arrived today... another speedy order to delivery...."
Roger OK, USA • May 2026
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"Always great products and service and I have been coming back for over 20 years now! THANK YOU"
Cathy Lees OK, USA • June 2025
 

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