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Ask us a question 877-271-6591 or 800-868-9064
U.S. Shipping Update: We are continuing to accept and ship orders to the United States.
The 22 October changes are new U.S. customs requirements, not a blanket FDA ban. Read our full update.

Shipping delays due to Covid-19 Virus

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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 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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"Hi, I just must stop and say thank you for all you girls have done over, the years. Your service is excellent! Always courteous and professional!"
David Koss PA, USA • July 2025
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"You guys are great keep doing what you're doing, i'd give y'all a tip if there was an option"
Stevie Rhodes UK • May 2025
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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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"Order arrived today... another speedy order to delivery...."
Roger OK, USA • May 2026
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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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"Your company has been a Godsend to me at times when I had no insurance, etc. Your service is wonderful & I’m grateful to you. I have used your service for quite a few years & I have never had a complaint."
Gwendolyn Shivers CA, 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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"Thank you again so very much! I couldn’t wish for a better company to do business with. Many thanks!"
Suze Moon WA, USA • April 2025
 

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