Answer
After intramuscular injection, botulinum toxin type A in BOTOX prevents acetylcholine release at presynaptic cholinergic nerve terminals at the neuromuscular junction, blocking transmission so nerve endings no longer respond to nerve impulses (chemical denervation).
Sources for this answer
- BOTOX 100 Allergan Units Powder for solution for injectionAbbVie Ltd · emc · SmPC §5.1 Pharmacodynamic properties · Version 46Document updated
Sources checked