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Ask us a question 877-271-6591 or 800-868-9064
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

Please fill the form to receive updates when we can ship your order.

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 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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"Always great products and service and I have been coming back for over 20 years now! THANK YOU"
Cathy Lees OK, USA • June 2025
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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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"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'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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"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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"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'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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"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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"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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