<unk>  is a medication used for the treatment of allergies and hay fever. It is a second-generation H1-receptor antagonist antihistamine (like its base molecule triprolidine) and works by blocking Histamine H1 receptors.
This non-sedating[verification needed] antihistamine is sold under the brand name Benadryl Allergy Relief in the United Kingdom by McNeil Laboratories, not to be confused with Benadryl Once a Day, which is cetirizine and is also sold by McNeil in the UK. It is available as an over-the-counter medication in the UK, also offered with pseudoephedrine under the Benadryl brand
In the U.S.,<unk>  is the active ingredient in the Semprex brand. Semprex-D is also<unk> -based, but contains a decongestant, pseudoephedrine. Semprex-D is marketed in the U.S. by Actient Pharmaceuticals.
Acrivastine
Bepotastine Besilate
Levocabastine
Mizolastine
Emedastine
Clemastine
Azelastine 
Pentagastrin