> Western Medicines > Olopatadine


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What is Olopatadine for?

Olopatadine is a second generation antihistamine that can relieve symptoms of allergic conjunctivitis, including red eyes, itchy eyes and swollen eyelids.

How to use it?

Olopatadine is available as an eye drop which may be instilled to the affected eyes. Wash your hands before and after applying this medication.


Allergic conjunctivitis
0.1% eye drop: Instil 1 drop into the affected eye(s) twice daily at an interval of 6-8 hours.
0.2% eye drop: Instil 1 drop into the affected eye(s) once daily.

What are the side effects of Olopatadine?

Common side effects of Olopatadine include dry eye, blurred vision, and headache.

Who should not take Olopatadine?

People allergic to Olopatadine or any component of the formulation.

Pharmacist Tips:

  • Applying the medication to the eye may cause blurred vision. If affected, do not drive or operate machinery.
  • Remove contact lenses prior to eye administration. You may reinsert contact lenses 10 minutes after using the eye drops.

Common dosing schedule:
Olopatadine is instilled to the eye once (0.1% eye drop) or twice (0.2% eye drop) daily.


This schedule is for reference only, adjustments may be made according to individual needs.


Some common medications Olopatadine may interact with:
Olopatadine may interact with other sedating medications, such as,

Please notify your doctor or pharmacist if you are taking the above medication, dosage adjustments might be needed.

Where to buy Olopatadine in Hong Kong?

In Hong Kong, Olopatadine is an over-the-counter medicine and can be purchased without a prescription from any retail outlet in Hong Kong. This includes grocery stores, convenience stores, medicine shops, and pharmacies. It can also be obtained from doctors. To find a pharmacy near you, refer to the list of pharmacies (“Authorized Sellers of Poisons”) from the Hong Kong Department of Health.


For more information about drug names and ingredients, you can visit Hong Kong’s Drug Office at https://www.drugoffice.gov.hk

Need more information?

For detailed information about the use of Olopatadine in children, pregnancy and breastfeeding, and for questions about drug interactions, please check with your pharmacist or doctor.

Disclaimer: our goal is to provide you with the most relevant drug information and common dosage for Hong Kong. This information does not constitute medical advice. For specific treatment recommendations and advice, always discuss with your doctor or pharmacist, and follow the instructions included with your specific medicine.

Brands in Hong Kong
Available dosage
  • 0.1% / 0.2% (Eye Drops)
Drug class
Sub class
Antihistamines (Second Generation)
Other drugs in same class
Used for: Seasonal allergic rhinitis, Urticaria
Chinese name:
Used for: Allergies, Hay fever, Urticaria
Chinese name:
Used for: Urticaria, Allergic conditions, Hay fever
Chinese name: