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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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"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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"Good service and products. Efficient handling. I am a happy customer."
Mary Hong Kong • October 2024
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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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"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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"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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"Thank you. I received my first shipment last week and I am very happy with the whole ordering experience and results."
Katherine FL, USA • November 2024
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"There's a reason I always come back to you for my meds; it's your customer service and your quality of products. Thanks for all you do! :) I love doing business with you all, thanks."
Anthony MO, USA • May 2026
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"Order arrived today... another speedy order to delivery...."
Roger OK, USA • May 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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"Hello, just a quick message to compliment you & your staff on maintaining such a high quality service. I have been a satisfied customer for too many years to count. While outside events ( an order seized by Customs) your company has kept every promise & made sure things were done to ensure delivery of products. I just want you to know that I can't think of any other company that is as excellent as Inhouse. The products offered are of top-notch quality. The customer service is incredibly effective & gracious in all communications. The updates on the order are wonderful, I know exactly how my order is moving thru the stages: order received/ order arranged for delivery/ order ready for mailing, tracking # given. It just hits all the check ✔️ marks. You folks blow other companies out of the water, just by doing things "right" & keeping communication lines open at every step.!! I appreciate you, & the other team members more than u will ever know. God Bless. "
Sandy Baker Michigian, USA • May 2026
 

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