Attention deficit hyperactivity disorder management
There are two major medications derived from methylphenidate's isomers: a racemic mixture of half d-threo-methylphenidate and half l-threo-methylphenidate called methylphenidate (Ritalin, Concerta), and an enantiopure formulation containing just d-threo-methylphenidate called dexmethylphenidate (Focalin).
Bilastine
Clinical studies using different dosages were done on histamine-induced wheal and flare reaction over a 24-h period, compared with a single 10-mg oral dose of cetirizine. The results of this research indicated that bilastine was at least as efficient as cetirizine in reducing histamine-mediated effects in healthy volunteers. Remarkably, 20 and 50 mg of bilastine reduced the wheal and flare reaction significantly more quickly than cetirizine.