The entire BOTOX® Cosmetic injection procedure takes approximately 10 minutes. Although no anesthesia is necessary, the doctor may apply a cold pack to the injection site to minimize discomfort. A very fine needle is used to inject Botox into specific muscles. The treatment requires no downtime. Results of the Botox treatment can be seen within 3 to 7 days. Common side effects following injection may include temporary bruising, tenderness, minor inflammation, and redness. In rare instances, some patients may experience headache or temporary eyelid drooping. These side effects resolve themselves within a week or so. Results of the Botox treatment are evident within 3 to 7 days.