Methods of using tetanus toxin to modulate or control neural functions or nonneural cellular activities at selected sites in animals, particularly in mammals, and more particularly in humans, are provided. Pharmaceutical formulations to modulate neural functions or non-neural cellular activities of an animal at selected sites in animals, particularly in mammals, and more particularly in humans are also provided. Uses of tetanus toxin in preparation of medicaments for methods of treating clinical disorders or symptoms of animals, particularly mammals and more particularly humans are also provided.