Normally, your brain sends electrochemical messages to your muscles to make them contract and move. These messages are transmitted from a nerve to the muscle by a substance called acetylcholine. When too much acetylcholine is released, muscles become overly active and spasm or tense up.

BOTOX® blocks the nerve from releasing acetylcholine. As a result, the muscle spasms stop or are greatly reduced, providing relief from symptoms. Your healthcare provider will know how much BOTOX® is needed to treat you effectively.

It's important to remember that botulinum toxin treatment is not a cure. For many people, however, its effects have been dramatic. With BOTOX®, the nerve will take about 3 months to recover and begin to release acetylcholine, and the muscles may become overactive again. At that point, another injection will be needed to provide relief, as long as no allergic reactions or other significant side effects occurred and clinical response was obtained.