BOTOX® is the trade name of Botulinum Toxin Type A, a purified toxin produced by the bacterium clostridium botulinum. It acts by blocking the nerve impulses to muscles. By using extremely small doses of BOTOX®, injected directly into a specific muscle, only the action of that muscle will be paralyzed. Therefore, the problem that muscle causes, like a frown line, or in other cases, a twitch or spasm, will be stopped.