4-Hydroxy nebivolol (4-OH nebivolol) hydrochloride is an active β-blocking hydroxylated metabolite of Nebivolol (HY-B0203)[1].
References
[1] Xiaoxia Hu, et al. Evaluation of 24 CYP2D6 Variants on the Metabolism of Nebivolol In Vitro. Drug Metab Dispos. 2016 Nov;44(11):1828-1831. DOI:10.1124/dmd.116.071811
