Botulinum Toxin and Phenol (Injected Spasticity Medications)
What Is Botulinum Toxin? What Is Phenol?
Botulinum toxin A is a protein injected directly into muscles as a medication. Phenol is a chemical injection that works similarly to botulinum toxin. Botulinum toxin injections are often more effective in smaller muscles and phenol might be more effective in larger muscles—sometimes they are used together.
Both are treatments for muscle spasticity—overly tight muscles caused by disrupted communication among the brain, spinal cord and peripheral nerves.
Injected spasticity medication blocks messages sent from nerves to the muscles that tell the muscles to contract. Spasticity is reduced when these messages are blocked, increasing comfort and improving function.