BOTOX® and Dysport® are the highly purified muscle protein (botulinum toxin-a), derived from the bacterium, Clostridium Botulinum. The toxin blocks the chemical signal between the muscle and the nerve, leading to temporary paralysis of the muscle*. The paralysis occurs over 1 to 5 days and peaks within two weeks. Results last from three to six months. The effect gradually wears off, allowing the dynamic wrinkle to return.