BOTOX is a muscle relaxant used to treat a number of conditions within the body. It contains the active substance botulinum toxin type A and is injected into either the muscles, the bladder wall or deep into the skin. It works by partially blocking the nerve impulses to any muscles that have been injected and reduces excessive contractions of these muscles.
When injected into the skin, BOTOX works on sweat glands to reduce the amount of sweat produced, or to give a temporary improvement in the appearance of vertical lines between the eyebrows seen at maximum frown (glabellar lines) or fan-shaped lines from the corner of the eyes seen at maximum smile (crow’s feet lines) or forehead lines seen at maximum raised eyebrows. When injected into the bladder wall, BOTOX works on the bladder muscle to reduce leakage of urine (urinary incontinence). In the case of chronic migraine, it is thought that BOTOX may block pain signals which indirectly block the development of a migraine. However, the way BOTOX works in chronic migraine is not fully established.
BOTOX must only be injected by doctors with specific skills and experience on how to use the medicine. BOTOX should only be prescribed for you for chronic migraine if you have been diagnosed by a neurologist who is a specialist in this area. BOTOX should be administered under the supervision of a neurologist. BOTOX is not used for acute migraine, chronic tension type headaches or patients with medication overuse headache.
Botox is a neurotoxin that temporarily blocks nerve signals to specific muscles or sweat glands. This targeted approach:
Relaxes muscles
Eliminates or reduces muscle spasms
Improves bladder capacity and incontinence symptoms
Improves eye alignment
Prevents migraines
Inactivates overactive sweat glands, reducing sweating.
Botox wears off with time as new nerve endings sprout and gradually reconnect with muscles or sweat glands, allowing them to work normally again in the treated area.
Like all medicines, this medicine can cause side effects, although not everybody gets them. In general, side effects occur within the first few days following injection. They usually last only for a short time, but they may last for several months and in rare cases, longer.
Allergan Botox 
Botulax
