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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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"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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"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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"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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"I want to say a big thank you to everyone at Inhouse Pharmacy. Over the last 4 years, you have been such a valuable part of my life. You have listened to me, helped me and shown such kindness. It is not an exaggeration to say that without the supply of medication from yourselves, I would not be alive today. People like myself in the UK are literally left to our own devices as the medical industry denies us life critical care. Please keep up the good work, and help as many people as you can. Thank you for all your help. "
Alan UK • October 2024
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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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"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, Sincerely, Sandy"
Sandra Baker MI,USA • May 2026
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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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"I'll definitely be ordering from you again. Communication is super, better than any other company. Ordering was super easy. Thanks again. Gloria"
Gloria Bach NY, USA • April 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 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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