Optilast contains the active substance azelastine hydrochloride, which belongs to a group of medicines called antiallergics (antihistamines).
Antihistamines work by preventing the effects of substances such as histamine that the body produces as part of an allergic reaction. Azelastine has been shown to reduce inflammation of the eye.
Optilast can be used to treat and prevent eye disorders which you get with hayfever (seasonal allergic conjunctivitis) in adults and children aged 4 years and above.
Optilast can be used for eye disorders caused by an allergy to substances such as house dust mites or animal hair (perennial allergic conjunctivitis) in adults and children aged 12 years and above.