Botulinum Toxins are derived from the bacteria that causes botulism. These products work by immobilizing the muscles that cause lines and wrinkles. Type A products include Botox® and Dysport®. They require injections 2 to 4 times a year. Type B products, such as Myobloc®, tend to be longer lasting. Some people are naturally resistant to botulinum toxins and cannot use these products.