Both Botox and Dysport are neurotoxins used to treat wrinkles that, when injected, relax the muscles, preventing them from contracting. This keeps wrinkles from forming. They are different from fillers, another popular way to treat wrinkles, as they target the muscles for relaxation instead of filling in the subcutaneous areas. While Botox and Dysport have similar methods of action, the differences lie in the amount needed for effective treatment as well as the length of time for each one to take effect. After an injection of Botox, it generally takes up to two weeks to show the full results, although some patients receiving Dysport injections may have more immediate effects. Botox lasts around three to six months, and Dysport is FDA-approved to last four months. However, in certain situations, Dysport may last as long as six months, depending on the individual and their lifestyle factors.