μ-Conotoxin BuIIIA (Mu-Conotoxin BuIIIA) is a voltage-gated sodium channel ( VGSC ) blocker. μ-Conotoxin BuIIIA is a toxic peptide that can be obtained from the venom of Cone snails. μ-Conotoxin BuIIIA can be used in the study of neurological diseases.