Botox Cosmetic (onabotulinurmtoxinA) is a prescription medicine that is injected into the muscles and used to improve the look of moderate to severe frown lines between the eyebrows, crowsfeet and forehead. It works by blocking nerve impulses to the injected muscles. This reduces muscle activity that causes those lines to form. Botox Cosmetic will erase or reduce glabellar lines (between eyebrows), crow’s feet, and forehead wrinkles depending on where the toxin is injected. The muscles still may move, but the frown lines will be reduced. The area may continue to improve for up to a month. This appears in 3-4 days and usually lasts for 3-4 months.