Lloyd, Joleen and whoever else,I'm not a medical-community person either...just a patient. But, with my research and a recent experience I had, spending extended-time with a rep for one pharmaceutical company (Elan Pharmaceuticals: producer of MYOBLOC, otherwise known as "botulinum toxin-type B"), they SAY that it is very localized at the site of injection as Botox is supposed to be also. Even though A and B work different in the body. In other words...they claim no build-up and no leaking into the system. Sounds like what Lloyd is describing.
As Lloyd says, I'm also very interested in seeing medical professionals post on this issue so we can all learn. The sales rep I met with was very knowledgable but we all know that sales folks vs. real-research and real-histories can be different things. This subject fascinates me so I hope to learn from others' postings on it.
--Lynne