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]
Getting Botox takes only a few minutes and no anesthesia is required. Botox is injected with a fine needle into specific muscles with only minor discomfort. It generally takes three to seven days to take full effect and it is best to avoid alcohol at least one week prior to treatment. Aspirin and anti-inflammatory medications should be stopped two weeks before treatment as well in order to reduce bruising.

Botulinum toxin (BTX) is a neurotoxic protein produced by the bacterium Clostridium botulinum and related species.[1] It prevents the release of the neurotransmitter acetylcholine from axon endings at the neuromuscular junction and thus causes flaccid paralysis. Infection with the bacterium causes the disease botulism. The toxin is also used commercially in medicine, cosmetics and research.
It's safe to say that the mouth is the clearest giveaway of work done too early. Youthful lips tend to have substantial volume and turn up naturally at the corners, meaning the best strategy for flattering them often comes down to a good signature lip color. For women who remain self conscious about the size or symmetry of their lips—think a slightly lopsided appearance, for instance—Botox can be injected into the orbicularis oris muscle along the lip line as an alternative to lip fillers. "When certain individuals smile, the lip flips in and they lose that upper volume," says Dara Liotta, a New York City-based plastic and cosmetic surgeon. "This relaxes the outer layers of the circular muscle around the lips and looks much more natural than filler." Additionally, injections along the jawline—or more specifically, the masseter muscle—have risen in popularity to relieve stress-induced jaw clenching and have also been known to refine the area. "A lot of people hold tension in the jaw area and when you relax that muscle, the chin comes out of the shadow of your lower lip,” explains Liotta. But the best advice of all? Forget about those self-perceived imperfections and smile. You're only in your '20s once.
Botox is administered by injection and dosing depends on the condition that it is used for. Administration of botulinum toxin with other agents (for example, aminoglycosides, curare) that affect neuromuscular function may increase the effect of botulinum toxin. There are no adequate studies of Botox in pregnant women and it has not been evaluated in nursing mothers.
As anyone who’s tried Botox for Migraine (or wrinkle reduction) will tell you, your forehead feels heavier after the injections are done, where the nerve endings are in essence frozen. As in ‘Frozen Face.’  Little to no movement, depending on how many units you receive and where they are injected. In my case, my usually expressive face didn’t track with my emotions: no raised eyebrows of surprise or delight or shock.

Botulinum toxin injections are one approach to the treatment of muscle spasticity. These injections can be given with ease and have minimal side effects. They can also be used in very focal spasticity problems that involve a few muscle groups. This treatment may not be right for some patients, such as patients with severe, widespread muscle spasticity, and patients with permanent muscle contractures that have become rigid.

This is because the discretionary procedures tend to be out of pocket, and providers are used to answering the question: how much does it cost? An MRI, on the other hand, might have several prices: A sticker price, a negotiated or reimbursed rate (what the insurance company pays), the rate that Medicare and Medicaid pay for treatments for people who are older and those who have low income, an out-of-network price, and so on. We know about this because we’ve done pricing surveys for about 35 common procedures in seven U.S. metro areas, collecting cash or self-pay prices for both medically necessary procedures (an MRI, a colonoscopy) and discretionary procedures (Botox, Lasik).
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Tell your doctor about all your medical conditions, including if you: have or have had bleeding problems; have plans to have surgery; had surgery on your face; weakness of forehead muscles; trouble raising your eyebrows; drooping eyelids; any other abnormal facial change; have symptoms of a urinary tract infection (UTI) and are being treated for urinary incontinence (symptoms of a urinary tract infection may include pain or burning with urination, frequent urination, or fever); have problems emptying your bladder on your own and are being treated for urinary incontinence; are pregnant or plan to become pregnant (it is not known if BOTOX® or BOTOX® Cosmetic can harm your unborn baby); are breastfeeding or plan to (it is not known if BOTOX® or BOTOX® Cosmetic passes into breast milk).
A placebo-controlled, double-blind randomized post-approval 52 week study (Study NDO-3) was conducted in MS patients with urinary incontinence due to neurogenic detrusor overactivity who were not adequately managed with at least one anticholinergic agent and not catheterizing at baseline. These patients were randomized to receive either 100 Units of BOTOX (n=66) or placebo (n=78).
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Botox should only be injected with sterile instruments in a doctor's office or a medical spa — not at Botox parties at your local nail salon or neighbor's living room. Botox injection is usually performed with some local anesthesia or a numbing cream. You may feel some minimal discomfort from the shot, but today's needles are so thin and fine that the procedure is often painless. Depending on the extent of treatment, the procedure can take anywhere from a few minutes to 20 minutes.
Exactly how soon you'll need to return for more Botox injections is really up to you. Some patients prefer to return for a touch up of Botox cosmetic after just three months, or at the very first sign of fine lines and facial wrinkles returning. Others prefer to wait six months or more until the effects of the previous injection have completely faded away.
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BOTOX blocks neuromuscular transmission by binding to acceptor sites on motor or sympathetic nerve terminals, entering the nerve terminals, and inhibiting the release of acetylcholine. This inhibition occurs as the neurotoxin cleaves SNAP -25, a protein integral to the successful docking and release of acetylcholine from vesicles situated within nerve endings. When injected intramuscularly at therapeutic doses, BOTOX produces partial chemical denervation of the muscle resulting in a localized reduction in muscle act ivity. In addition, the muscle may atrophy, axonal sprouting may occur, and extrajunctional acetylcholine receptors may develop. There is evidence that reinnervation of the muscle may occur, thus slowly reversing muscle denervation produced by BOTOX.
Two double-blind, placebo-controlled, randomized, multi-center, 24-week clinical studies were conducted in patients with OAB with symptoms of urge urinary incontinence, urgency, and frequency (Studies OAB -1 and OAB-2). Patients needed to have at least 3 urinary urgency incontinence episodes and at least 24 micturitions in 3 days to enter the studies. A total of 1105 patients, whose symptoms had not been adequately managed with anticholinergic therapy (inadequate response or intolerable side effects), were randomized to receive either 100 Units of BOTOX (n=557), or placebo (n=548). Patients received 20 injections of study drug (5 units of BOTOX or placebo) spaced approximately 1 cm apart into the detrusor muscle.
Lastly, a Botox treatment does not offer permanent results. Botox is most effective when treatments are carried out at regular intervals before the results fully wear off. On average, the results last for three to four months,  although Botox metabolizes at different rates in different individuals. The first ever Botox treatment you receive may not last as long as subsequent treatments, plus you may require touch-ups two weeks after the procedure as your injector determines the right dosage for you. Over time, however, many patients notice that they can wait longer intervals between treatments as their treated facial muscles weaken.
Spread of toxin effects. The effect of botulinum toxin may affect areas away from the injection site and cause serious symptoms including: loss of strength and all-over muscle weakness, double vision, blurred vision and drooping eyelids, hoarseness or change or loss of voice, trouble saying words clearly, loss of bladder control, trouble breathing, and trouble swallowing.
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