Botulinum toxin A is sometimes referred to in slang as snake venom. In the correct translation from the Latin, it would, however, are called sausage poison. It is a neurotoxin, which is a poison that affects the nerves. Botulinum toxin A can treat facial wrinkles. These are wrinkles that are caused by the contraction of certain facial muscles. The botulinum toxin A interrupts the nerve impulses to the muscle, and this relaxes.