Wiktionary
alcaftadine
n. An H1 histamine receptor antagonist used to prevent eye irritation brought on by allergic conjunctivitis.
Wikipedia
Alcaftadine
Alcaftadine is used to prevent eye irritation brought on by allergic conjunctivitis. It is a H1 histamine receptor antagonist.
It was approved by the U.S. Food and Drug Administration in 2010 under the trade name Lastacaft.