Botox has established medical uses, for instance, eyelid conditions such as entropion (lower eyelid turning in), to lower the upper eyelid to protect the eye if exposed in severe facial paresis, for facial spasm (blepharospasm), neck spasm (torticollis) and some double vision.
How it works:
Botulinum toxin A (BTX A) is a very powerful toxin which when injected in minute amounts into a muscle, will cause a temporary paralysis of that muscle. It works on the motor end plates of skeletal muscle. It also has an action on sympathetic smooth muscle and glands such as sweat glands (used to stop underarm sweating).
It blocks the release of a neurotransmitter acetylcholine necessary for initiating muscle contraction Its effect starts from between 3 to 7 days after injection and lasts between 2 and 6 months (average 4 months). The peak action is at 7 to 10 days after injection with complete paralysis of the muscle area treated, which then it gradually wears off. Injections can be repeated.