National MS Society | Botulinum Toxin (Botox) for MS

There are seven botulinum toxins (labeled A to G). All are powerful neurotoxins (poisons) that block the release of acetylcholine at the junction of nerves and muscles. Acetylcholine is a chemical that, among other things, signals muscles to contract. Blocking the acetylcholine results in the temporary relaxation of targeted muscles. This action of botulinum toxins makes them potentially useful in the treatment of MS-related muscle stiffness (spasticity) and urinary
http://www.nationalmssociety.org/Clinup-Botox.asp