Botulinum toxin A is promoted beneath the model names Botox (marketed by Allergan), Dysport (promoted by Galderma), and Xeomin (promoted by Merz Pharma). Botox relaxes and softens overactive facial muscles that lead to wrinkles and features to sort in between your brow, the sides of one's eyes (crow's ft) and on your forehead.A. Duration of benefit