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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

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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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"Thank you as always for the great customer service and always responding quickly to any questions I have."
David MI, USA • January 2024
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"I received your replacement shipment today. Thank you for your help and patience in this matter. I've ordered several other medications from you over the last 3 years, all of which arrived promptly. I have told a number of people about your outstanding service and reliable medications. Again, thank you so much."
Brian CA, USA • January 2024
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Colee FL, USA • January 2024
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Emily OH, USA • January 2024
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Fred MO, USA • January 2024
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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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"Thank You for the Professional and Prompt way you have handled my missing shipment.  I have been doing business with you for a long time and I so much appreciate when a company values their customers and addresses issues in such a caring way and with such integrity.  I will be doing business with you for a very long time to come.  Thank You again."
Sheila OH, USA • January 2024
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Mary Hong Kong • October 2024
 

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