<unk>  is a histamine H1 receptor antagonist that is FDA approved for the treatment of itching associated with allergic conjunctivitis.   Common adverse reactions include Disorder of taste, eye irritation, headache, and nasopharyngitis.
Bepotastine Besilate
Azelastine Hydrochloride
Epinastine hydrochloride
Azelastine 
Acrivastine
Clemastine
Emedastine Difumarate
Pemirolast