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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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"Dear Pharmacist, I want to extend my sincere appreciation for your professionalism and kind demeanour regarding my medication. I received it today, Monday, May 18 and in fewer than two weeks!! Remarkable. Please extend my thanks to the team. You are an asset to your profession. Thank you once again. I look forward to ordering again with your entity in the future."
MaryAnn Ulander NV, USA • May 2026
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"I've been an Inhouse customer for over 20 years. Exemplary customer service and very responsive if you have any questions or need any assistance with your orders!"
Dave MI, USA • May 2026
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"I have been a customer for so long I can't remember when I signed up and it was over 10 years ago. I have been nothing but PLEASED with the service you provide. Here in the US people in my neighbourhood are crying for a decent pharmacy I've mentioned Inhousepharmacy.vu to these folks on a neighbourhood service."
Victor Riggan TX, USA • August 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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"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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"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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"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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"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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"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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