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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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"Package received! I want to thank you on behalf of my family for your wonderful service. My daughter cannot purchase domperidone in the States, and it is critical to her health. You have been a lifesaver. Thank you for making this drug available to her, and for the competent and courteous service your company provides. We are all grateful."
Rebecca McClear MI, USA • October 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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"Order arrived today... another speedy order to delivery...."
Roger OK, 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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"Inhouse Pharmacy are great. So reliable and a great range of products. Keep at it!"
Philip Honey UK • September 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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"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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"Since 2003, Inhouse Pharmacy has continued to exceed my expectations of quality customer service. To date, I've experienced only one issue related to goods in transit, which was quickly remedied by Inhouse Pharmacy's customer service team. Whenever I have requested assistance from their staff, they have always been courteous, friendly and professional. I cannot fault their service. 10/10 stars, please keep doing what you are doing!"
Mateja NSW, AU • 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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"I have ordered with Inhouse for many years. They've always been excellent. Even after emergencies when we needed things in the past, I've never been let down. They've always been lovely to me and I just feel like I'm getting things from friends. So, I love Inhouse! There hasn't been anything bad, so it would be a new one if there ever was. The goods have always been delivered as seen and priced as advertised, and replaced if necessary. So, it's a straight 5-star award."
Gina UK • June 2026
 

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