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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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"Inhouse Pharmacy are great. So reliable and a great range of products. Keep at it!"
Philip Honey UK • September 2025
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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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Stevie Rhodes UK • May 2025
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Melissa Reiger GA, USA • July 2025
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"I have ordered with Inhouse for many years. They've always been excellent. Even after emergencies when we needed things in the past, I've never been let down. They've always been lovely to me and I just feel like I'm getting things from friends. So, I love Inhouse! There hasn't been anything bad, so it would be a new one if there ever was. The goods have always been delivered as seen and priced as advertised, and replaced if necessary. So, it's a straight 5-star award."
Gina UK • June 2026
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"My total experience with Inhouse Pharmacy is I can trust you guys to the moon and back."
Janelle FL, USA • May 2026
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"You guys are honestly top notch, especially in a world where access to healthcare is being constantly gate kept, you all are a force of good in that fight. Thank you! You guys really are the best! Please don't change."
Shane MI, USA • May 2026
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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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"Been using inhouse for about 6 years now and they've never let me down. On one occassion I was unable to get my parcel so I assumed I had lost money, but two weeks later they refunded me. Great company."
Katie Heys UK • June 2025
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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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