BOTOX is a muscle relaxant that is injected into the muscles or deep into the skin. BOTOX is presented as a thin film in a transparent glass vial. Prior to injection, the product must be dissolved in a sterile saline solution. It works by partially blocking the nerve impulses to any muscles that have been injected and reduces excessive contractions of these muscles. In the case of chronic migraine, it is thought that BOTOX blocks pain signals, which indirectly block the development of a migraine. When injected into the skin, BOTOX works on sweat glands to reduce the amount of sweat produced. When injected into the bladder wall, BOTOX works on the bladder muscle to prevent leakage of urine (urinary incontinence) due to uncontrolled contractions of the bladder muscle.

In adults, BOTOX is used to control persistent muscle spasms in the eyelid and face; persistent muscle spasms in the neck and shoulders; persistent muscle spasms in the wrist and hand of patients who have suffered a stroke; excessive sweating of the armpits that affects the activities of daily living, when other local treatments do not help; leakage of urine due to bladder problems associated with spinal cord injury or multiple sclerosis.