Botox can be used on the neck for improvement of the vertical bands. It is not FDA approved for this indication, but it has been used successfully off-label for years. Results are usually appreciable, but not as dramatic as when Botox is used on the face, particularly the glabella and crow's feet. Many wrinkles of the neck are due to skin laxity rather than muscle activity, and these will not be improved appreciably.
Smaller injection doses are used, usually 2-3 units per injection point, with 10-20 units total for the neck.