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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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"Great Service for over a decade! Thank you, Inhouse Pharmacy!"
Lisa Button WA, USA • September 2025
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"Hello, I have excellent news to report. My replacement order arrived today, thank you so much for sending it out to me. Everything came perfectly intact and I have already began to take the meds. Thank you so much for everything, you are a great company. Take care and be blessed."
Mira DE, USA • February 2024
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Cathy Lees OK, USA • June 2025
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Katherine FL, USA • November 2024
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"Staff is very responsive and I do not mind the shipping times! Very affordable and has helped my quality of life a lot. Had one hiccup and staff were QUICK with assisting me to ensure I get what I paid for! Have been a customer since 2022."
Emily OH, USA • January 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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"Order received - thanks for excellent service!"
Fred MO, USA • January 2024
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"Thank you for the reply. It sure is encouraging. It’s also pointing to a never fail. To years of me using In-house Pharmacy and for quality pharmaceuticals without a hitch. "
William WV, USA • January 2024
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"I want to say a big thank you to everyone at Inhouse Pharmacy. Over the last 4 years, you have been such a valuable part of my life. You have listened to me, helped me and shown such kindness. It is not an exaggeration to say that without the supply of medication from yourselves, I would not be alive today. People like myself in the UK are literally left to our own devices as the medical industry denies us life critical care. Please keep up the good work, and help as many people as you can. Thank you for all your help. "
Alan UK • October 2024
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Mike OK, USA • February 2024
 

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