Estina Eye Drop contains Epinastine 0.05% w/v, an effective antihistamine used to relieve symptoms associated with allergic conjunctivitis such as itching, redness, and swelling of the eyes. Epinastine works by selectively blocking H1 histamine receptors, thereby preventing the action of histamine, a chemical responsible for allergic reactions. This medication provides rapid relief from ocular allergy symptoms and helps reduce inflammation and discomfort. Estina Eye Drop is typically administered as one or two drops in the affected eye(s) twice daily or as directed by a healthcare professional. It is suitable for adults and children over a certain age, but patients should consult their doctor before use, especially if they have any pre-existing eye conditions or are using other eye medications. Common side effects may include mild burning or stinging upon instillation, dry eyes, or headache, which usually subside quickly. Patients should avoid touching the dropper tip to any surface to prevent contamination and should not wear contact lenses during application unless advised otherwise. Estina Eye Drop offers a convenient and effective solution for managing allergic eye symptoms, improving comfort and quality of life for individuals suffering from ocular allergies.