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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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"I have been a happy and satisfied customer of Inhouse Pharmacy for over 20 years. I have always been treated with great courtesy and my yearly order has always arrived between ten and twelve days after submitting the order. I would unqualifiedly recommend this company."
Wayne VA, USA • June 2026
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"Thank you so very much. I appreciate all the help & responses that you've provided. Its not often that companies go that extra mile but you have & Im truly grateful for it."
Melissa Reiger GA, USA • July 2025
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"Thank you InHouse Pharmacy for your note, kindness and understanding. Thank you also for the quality service and products."
Paul Sehnke CA, USA • April 2026
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"Order arrived today... another speedy order to delivery...."
Roger OK, USA • May 2026
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"My experience with Inhouse Pharmacy in Vanuatu was smooth and efficient from beginning to end. I found the instructions on the website easy to understand and follow. I was also able to get phone information easily. I would offer one suggestion: that the office hours and time zone be indicated on the website. Furthermore, I was kept abreast of my order status, and the order arrived safe and sound right around the time I was told it would. I would not hesitate to order products from Inhouse again. Thank you."
Taylor NM, USA • June 2026
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"Great service, never had a problem"
Kimberly NM, USA • August 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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"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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"Great Service for over a decade! Thank you, Inhouse Pharmacy!"
Lisa Button WA, USA • September 2025
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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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