Cheers! I do not anticipate you having any problems with Juvederm. It should not affect your neurological disorders since Juvederm is a dermal filler that is biochemically comprised of hyaluronic acid.
Hyaluronic acid is found naturally occurring in the skin of humans. The degree of your facial movement and the proximity of the Juvederm injections could possibly effect the duration of the product. In other words, it may not last as long. Anatomically, we see this with all patients: injections in the lips do not last as long as Juvederm injected into the smile creases.
Prior to your injections, I would advise you to obtain medical clearance with your internist, neurologist and/or pulmonologist. As with any medical procedure, a thorough and informed consent should be obtained from your treating physician, discussing the nature and purpose of the procedure, and its inherent risks and complications.
Best of luck! I hope this helps.