Botox is the trade name for highly purified Botulinum toxin Type A, produced by bacteria called Clostridium botulinum. Several types of toxins have been identified, but type A, which is used commercially, is the most potent. Botox injections are the best known of a group of medications that use various forms of botulinum toxin to temporarily paralyze muscle activity. This toxin is produced by the microbe that causes botulism, a type of food poisoning. Botox was the first drug to use botulinum toxin. Other products now include Dysport, Myobloc and Xeomin. Each is a little different, particularly when it comes to dosage units, so they aren’t interchangeable.