Wiktionary
epinastine
n. A particular antihistamine drug used in eye drops to treat allergic conjunctivitis.
Wikipedia
Epinastine
Epinastine (brand names Alesion, Elestat, Purivist, Relestat) is a second-generation antihistamine and mast cell stabilizer that is used in eye drops to treat allergic conjunctivitis. It is produced by Allergan and marketed by Inspire in the United States. It is highly selective for the H receptor and does not cross the blood-brain-barrier.