Selamectin paralyserer og/ eller dræber en lang række hvirvelløse parasitter ved at interfere med indstrømningen af kloridioner i nervecellerne, hvorved den normale neurotransmission forstyrres.
Selamectin paralyses and/ or kills a wide range of invertebrate parasites through interference with their chloride channel conductance causing disruption of normal neurotransmission.