<unk>  is a antihistamine that is FDA approved for the treatment of allergic conjunctivitis.   Common adverse reactions include headache.
Emedastine Difumarate
Azelastine Hydrochloride
Bepotastine Besilate
Mizolastine
Pemirolast
Dihydroergotamine 
Nitroxoline
Seratrodast