Botox (onabotulinum toxin A) and Dysport (abobotulinum toxin A) and Xeomin (incobotulinum toxin A) are all different formulations of botulinum toxin A. The difference in the formulations are due to the size of the accessory protein chains attached to the active toxin protein. It remains to be seen whether this is clinically relevant. Some providers and patients have favorite formulations, but all work to weaken muscular activity to prevent wrinkles or smooth wrinkles that have already formed.