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At this time, there are two commercially available botulinum toxins in the United States: BOTOX® (type A) and Myobloc® (type B). However, Dysport® (type A) is under consideration for licensing by the United States Food and Drug Administration. The neurotoxins differ in potency, formulation, and manufacturing. Each BOTOX® vial contains approximately 100 units, Myobloc® is dispensed in vials of 2,500, 5,000, and 10,000 units, and each Dysport® vial contains approximately 500 units.
Furthermore, 1 BOTOX® unit is the equivalent of 3 to 5 Dysport® units and is approximately the equivalent of 50 to 100 units of Myobloc®.