BOTOX® Cosmetic (onabotulinumtoxinA) is the only approved prescription medication, derived from a natural purified protein, used to improve the look of moderate to severe forehead lines, frown lines or crow’s feet in adults 18-65 years of age. It works by blocking the nerve impulses to the injected muscles, reducing the muscle activity that causes lines to form. As these injected muscles then relax, the skin covering the muscle is smoothed. Repeated treatments often lead to an increased duration of desired results. Your treatment takes about 10-15 minutes, but results won’t be apparent for 3-5 days. Depending on the patient, results will usually last between 3 to 5 months.