6-Hydroxydopamine hydrobromide (CAS 636-00-0) commonly referred to as 6-OHDA hydrobromide is a catecholamine-derived neurotoxin frequently used in neuroscience research to induce selective dopaminergic neuronal degeneration Upon administration it generates intracellular reactive oxygen species (ROS) activating apoptotic pathways via caspase-3 -8 and -9 as demonstrated in PC12 cell studies In rodent models targeted injection into substantia nigra striatum or medial forebrain bundle leads to loss of tyrosine hydroxylase-positive neurons and resultant locomotor dysfunction resembling symptoms observed in Parkinson s disease Consequently it serves as a valuable tool for elucidating dopaminergic dysfunction mechanisms and evaluating therapeutic candidates