Botulinum toxin can unfold to a distance of thirty–45 mm within the injected muscles for the adjacent muscles, whether or not these muscles are divided by fasciae. Neck muscles are at risk of diffusion of botulinum toxin, and paralysis of the wrong muscles contributes to dysphonia, dysphagia or dystonia. https://jetonlinepharma.us/product-category/botulinum-toxins/