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U.S. Shipping Update: We are continuing to accept and ship orders to the United States.
New U.S. customs requirements take effect from 20 January 2027. Read our full update for what this means for your order.

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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5 Stars

Customer Review

Hear from more than 1000 happy customers!
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"I am so fortunate to have found this company for my medication. I have used other entities, but they fall well below your efficient customer service, ease of ordering through the website and quick receipt of my meds. It is so hassle-free. Thank you for all your assistance with my health needs."
MaryAnn Ulander NV, USA • February 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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"Order arrived today... another speedy order to delivery...."
Roger OK, USA • May 2026
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"Great service, never had a problem"
Kimberly NM, USA • August 2025
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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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"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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"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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"Just love this place. Great customer service and always delivery as requested. Been doing business with them for years. Thank you so much Inhouse"
Cheryl Owens TX,USA • August 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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"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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