nebivolol [ Berlin-Chemie brand of nebivolol hydrochloride,Lobivon,Menarini brand of nebivolol hydrochloride,Nebilet,R 67555,R-67555,Silostar,Uriach brand of nebivolol hydrochloride,alpha,alpha'-(iminobis(methylene))bis(6-fluoro-3,4-dihydro)-2H-1-benzopyran-2-methanol,nebivolol hydrochloride ] selective b1-blocker with additional vasodilator effects which are mediated by the endothelial L-arginine/nitric oxide system