The toxin itself is released from the bacterium as a single chain, then becomes activated when cleaved by its own proteases.[11] The active form consists of a two-chain protein composed of a 100-kDa heavy chain polypeptide joined via disulfide bond to a 50-kDa light chain polypeptide.[35] The heavy chain contains domains with several functions: it has the domain responsible for binding specifically to presynaptic nerve terminals, as well as the domain responsible for mediating translocation of the light chain into the cell cytoplasm as the vacuole acidifies.[1][35] The light chain is a zinc metalloprotease and is the active part of the toxin. It is translocated into the host cell cytoplasm where it cleaves the host protein SNAP-25, a member of the SNARE protein family which is responsible for fusion. The cleaved SNAP-25 is unable to mediate fusion of vesicles with the host cell membrane, thus preventing the release of the neurotransmitter acetylcholine from axon endings.[1] This blockage is slowly reversed as the toxin loses activity and the SNARE proteins are slowly regenerated by the affected cell.[1]
There are several medically related BOTOX ® treatments that are usually covered by insurance, including treatment for blepharospasm (uncontrollable eye twitching), excessive sweating, constant pain, and others. Insurance coverage for cosmetic uses of BOTOX® injections is much less common, but you should consult your insurance provider to find out if you have coverage for BOTOX® treatment. Also, Allergan, the maker of BOTOX ®, provides a Reimbursement Hotline at 1-800-530-6680. An Allergan representative can help you determine whether your procedure is covered by insurance.
Shah says that it’s harder to treat wrinkles with just Botox as they get more and more ingrained into the face. “Some people may need just a few injections, but some may require more treatments, such as laser treatments or a series of smaller procedures, which are going to cost more. Whereas if they came in five years earlier, I may have just been able to use Botox to get the same effect,” she says.

It is not known whether BOTOX® is safe or effective to treat increased stiffness in upper limb muscles other than those in the elbow, wrist, fingers, and thumb, or in lower limb muscles other than those in the ankle and toes. BOTOX® has not been shown to help people perform task-specific functions with their upper limbs or increase movement in joints that are permanently fixed in position by stiff muscles. Treatment with BOTOX® is not meant to replace existing physical therapy or other rehabilitation that may have been prescribed.
When the deal with Teva closed in August 2016, it left Allergan with $40 billion to spend. Some of that went to repurchase shares, while some went to a series of acquisitions that totaled about $6.5 billion. One of the bigger deals was for a company developing treatments for NASH, a liver condition that Saunders said would become "one of the next epidemic-level chronic diseases we face as a society."
Botox is considered as an elective procedure which means that the insurance does not cover the cost. But in case of treating medical conditions, an insurance can cover the cost of the treatment but make sure to consult your doctor regarding the coverage. Botox injections can also be used to treat conditions such as excessive perspiration (hyperhidrosis), migraine and muscle spasticity.
Beware of Botox injections at a "Botox party" at someone's house. You need to be in a medical setting, where any side effects can be treated immediately. You may not see the final effects of the injections during the party anyway, as they usually take a few days. A Botox party isn't such a bad idea if it's held by a doctor in a medical setting, but even then there's a risk of the doctor's attention being divided between you and the other attendees.
The recommended dilution is 200 Units/2 mL, 200 Units/4 mL, 100 Units/1 mL, or 100 Units/2 mL with preservative-free 0.9% Sodium Chloride Injection, USP, depending on volume and number of injection sites desired to achieve treatment objectives (see Table 1). In general, no more than 50 Units per site should be administered using a sterile needle (e.g., 25-30 gauge) of an appropriate length. Localization of the involved muscles with electromyographic guidance may be useful.

Botulinum toxin is used to treat a number of disorders characterized by overactive muscle movement, including post-stroke spasticity, post-spinal cord injury spasticity, spasms of the head and neck,[8] eyelid,[9] vagina,[10] limbs, jaw, and vocal cords.[11] Similarly, botulinum toxin is used to relax clenching of muscles, including those of the oesophagus,[12] jaw,[13] lower urinary tract and bladder,[14] or clenching of the anus which can exacerbate anal fissure.[15] It may also be used for improper eye alignment.[16] Botulinum toxin appears to be effective for refractory overactive bladder.[17]

Before using this medication, tell your doctor your medical history, especially of: bleeding problems, eye surgery, certain eye problem (glaucoma), heart disease, diabetes, signs of infection near the injection site, urinary tract infection, inability to urinate, muscle/nerve disorders (such as Lou Gehrig's disease-ALS, myasthenia gravis), seizures, trouble swallowing (dysphagia), breathing problems (such as asthma, emphysema, aspiration-type pneumonia), treatment with any botulinum toxin product (especially in the last 4 months).

Study 4 included 170 patients (87 BOTOX and 83 placebo) with upper limb spasticity who were at least 6 months post-stroke. In Study 4, patients received 20 Units of BOTOX into the adductor pollicis and flexor pollicis longus (total BOTOX dose =40 Units in thumb muscles) or placebo (see Table 30). Study 5 included 109 patients with upper limb spasticity who were at least 6 months post-stroke. In Study 5, patients received 15 Units (low dose) or 20 Units (high dose) of BOTOX into the adductor pollicis and flexor pollicis longus under EMG guidance (total BOTOX low dose =30 Units, total BOTOX high dose =40 Units), or placebo (see Table 30). The duration of follow-up in Study 4 and Study 5 was 12 weeks.

In 1820, Justinus Kerner, a small-town German medical officer and romantic poet, gave the first complete description of clinical botulism based on extensive clinical observations of so-called “sausage poisoning”.[37] Following experiments on animals and on himself, he concluded that the toxin acts by interrupting signal transmission in the somatic and autonomic motor systems, without affecting sensory signals or mental functions. He observed that the toxin develops under anaerobic conditions, and can be lethal in minute doses.[38] His prescience in suggesting that the toxin might be used therapeutically earned him recognition as the pioneer of modern botulinum toxin therapy.[39]
Table 14 presents the most frequently reported adverse reactions in a placebo-controlled, double-blind post-approval 52 week study with BOTOX 100 Units (Study NDO-3) conducted in MS patients with urinary incontinence due to detrusor overactivity associated with a neurologic condition. These patients were not adequately managed with at least one anticholinergic agent and not catheterized at baseline. The table below presents the most frequently reported adverse reactions within 12 weeks of injection.
One of the most beneficial uses of BOTOX\for migraines is that it can serve as an indicator of how effective migraine surgery might be for you. BOTOX stops contracting muscles from irritating triggering nerves. If that gives you relief, you may benefit from surgery to “free up” pressure on those nerves. Using BOTOX may also help identify which nerves could be triggering your migraines, making surgical intervention more targeted.
Tell your doctor about all your medical conditions, including: plans to have surgery; had surgery on your face; have trouble raising your eyebrows; drooping eyelids; any other abnormal facial change; are pregnant or plan to become pregnant (it is not known if BOTOX® Cosmetic can harm your unborn baby); are breast-feeding or plan to (it is not known if BOTOX® Cosmetic passes into breast milk).