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Of the 650 species of leech listed, Hirudo medicinalis is one of the most extensively studied. This annelid from the subclass Hirudinea has 2 suckers, one housing the mouth and its 3 jaws. It lives mainly in the stagnant waters of marshes and ponds. When it comes to reproduction, the animal is a hermaphrodite. Inseminated leeches lay their eggs during the spring and summer months, outside the water, with cocoons containing as many as thirty young.
It means that dosages are not equivalent across product lines. In other words, 1 unit of botox is NOT the same as 1 unit of myobloc. Furthermore, duration of effect may be different as well as immune response. Also as an FYI, Botox, Xeomin, and Dysport are Botulinum toxin type A whereas Myobloc is type B. Dr. Chang performs botox injections for a variety of problems using Botox by Allergan. At least for spasmodic dysphonia, the conversion factor is 52.3:1 Myobloc (BTX-B) to Botox (BTX-A). Not many people know that there are FOUR different types of botox available and FDA approved for use in the United States. Labels: botox, botulinum, dysport, myobloc, toxin, type, xeomin.