Botox is used medically to treat certain muscular conditions, and cosmetically to remove wrinkles by temporarily paralyzing muscles. It is made from a neurotoxin called botulinum toxin that is produced by the bacterium Clostridium botulinum.

Botox was licensed specifically for the treatment of chronic migraine in July 2010 by the Medicines and Healthcare products Regulatory Agency (MHRA).

Reference : https://www.migrainetrust.org/living-with-migraine/treatments/botox/, July 2, 2019.