Bisulepin

Bisulepin is strong and relatively selective antihistamine (H1 antagonist) with hypnotic, antiadrenergic and very weak anticholinergic and antiserotonergic effects. Bisulepin is marketed in the Czech Republic and Slovakia under the trademark Dithiaden as tablets and injections.
The registered active form is the "trans"- (i.e. "E"-) isomer.