RimabotulinumtoxinB (Myobloc), also called botulinum toxin type B, is made from the bacteria that causes botulism. Botulinum toxin blocks nerve activity in the muscles, causing a temporary reduction in muscle activity. Myobloc is used to treat cervical dystonia (severe spasms in the neck muscles). Myobloc may also be used for other purposes not listed in this medication guide.
Myobloc is a neurotoxin medication used to treat symptoms of cervical dystonia, which is a head and neck problem that can lead to neck pain and an abnormal head position. Myobloc works by interfering with nerve impulses to certain muscles, which temporarily paralyzes those muscles and thus relieving the pain and discomfort.