[b] These values represent the prospectively planned method for missing data imputation a nd statistical test. Sensitivity analyses indicated that the 95% confidence interval excluded the value of no difference between groups and the p -value was less than 0.05. These analyses included several alternative missing data imputation methods and non-parametric statistical tests.
"The cost for a procedure depends on two main factors," explains Joshua Zeichner, MD, a board-certified dermatologist. "First, different products cost different amounts because of the technology that goes into their manufacturing. In addition, the cost depends on the fee of the injector. If you are seeing a sought-after, skilled injector, you may be paying a premium for that treatment. Especially when getting injectable fillers, your treatment is dependent on the skill and aesthetic of your injector. I do not recommend compromising here or purchasing a deal on websites like Groupon."

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.
Vials of BOTOX have a holographic film on the vial label that contains the name “Allergan” within horizontal lines of rainbow color. In order to see the hologram, rotate the vial back and forth between your fin gers under a desk lamp or fluorescent light source. (Note: the holographic film on the label is absent in the date/lot area.) If you do not see the lines of rainbow color or the name “Allergan”, do not use the product and contact Allergan for additional information at 1-800-890-4345 from 7:00 AM to 3:00 PM Pacific Time.
In 1986, Oculinum Inc, Scott's micromanufacturer and distributor of botulinum toxin, was unable to obtain product liability insurance, and could no longer supply the drug. As supplies became exhausted, patients who had come to rely on periodic injections became desperate. For 4 months, as liability issues were resolved, American blepharospasm patients traveled to Canadian eye centers for their injections.[48]
The needle should be inserted approximately 2 mm into the detrusor, and 20 injections of 0.5 mL each (total volume of 10 mL) should be spaced approximately 1 cm apart (see Figure 1). For the final injection, approximately 1 mL of sterile normal saline should be injected so that the remaining BOTOX in the needle is delivered to the bladder. After the injections are given, patients shou ld demonstrate their ability to void prior to leaving the clinic. The patient should be obser ved for at least 30 minutes post-injection and until a spontaneous void has occurred.
Recently, there has been an emerging trend of “BOTOX® Cosmetic parties,” in which several people gather at a physician’s house or another location to have BOTOX® Cosmetic injections at a lower cost. While prices for treatment may be somewhat lower at a BOTOX® Cosmetic party than for treatment administered during a normal office visit, the situation may not be ideal. The American Academy of Dermatology and the American Society of Aesthetic Plastic Surgery have both issued warnings against such “parties,” as they have reservations about the ability of the physician to provide a safe and sterile environment outside of their office.
Botox should definitely last longer than a few weeks, but how much longer varies. First time Botox users, for example, might experience Botox wearing off in less than 3 months. However, as facial muscles get conditioned to Botox, results should lengthen. Botox injections around the eyes can also last shorter than 3 months. Men, on the other hand, tend to need more Botox than women. Whatever the case, Botox results should generally last around 3 months, give or take a few days.
When BOTOX (4, 8, or 16 Units/kg) was administered intramuscularly to pregnant mice or rats two times during the period of organogenesis (on gestation days 5 and 13), reductions in fetal body weight and decreased fetal skeletal ossification were ob served at the two highest doses. The no-effect dose for developmental toxicity in these studies (4 Units/kg) is approximately equal to the human dose of 400 Units, on a body weight basis (Units/kg).
If you have eyelid drooping after a Botox procedure, it is a good idea to let the cosmetic surgeon know because there is a medicine available to help this condition. Any other difficulties, such as difficulty breathing or rashes, should be reported to the surgeon immediately. Bruises are generally gone within one to two weeks, there are other medications available for the treatment of these, such as vitamin K topical treatments (Dr. Holmquist Healthcare CytoActive Post-Procedural Bruise Relief, Revision Skincare Vitamin K Serum, Clinicians Complex Bruise Cream, Glymed Plus Arnica+ Healing Cream).
There are no data on the presence of BOTOX in human or animal milk, the effects on the breastfed child, or the effects on milk production. The developmental and health benefits of breastfeeding should be considered along with the mother's clinical need for BOTOX and any potential adverse effects on the breastfed infant from BOTOX or from the underlying maternal conditions.
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.
Extraocular muscles adjacent to the injection site can be affected, causing vertical deviation, especially with higher do ses of BOTOX. The incidence rates of these adverse effects in 2058 adults who received a total of 3650 injections for horizontal strabismus was 17%. The incidence of ptosis has been reported to be dependent on the location of the injected muscles, 1% after inferior rectus injections, 16% after horizontal rectus injections and 38% after superior rectus injections.
When BOTOX (4, 8, or 16 Units/kg) was administered intramuscularly to pregnant mice or rats two times during the period of organogenesis (on gestation days 5 and 13), reductions in fetal body weight and decreased fetal skeletal ossification were ob served at the two highest doses. The no-effect dose for developmental toxicity in these studies (4 Units/kg) is approximately equal to the human dose of 400 Units, on a body weight basis (Units/kg).
"There is a difference in pricing based on the duration of the results," says L.A.-based injection specialist Lisa Goodman. (FYI: She's incredible, and I emphatically recommend seeing her if you're in L.A. or Dara Liotta, MD, if you're in NYC.) "The longer-lasting formulas cost more upfront. Shorter-term fillers can last from six to 11 months based on the patient's rate of aging (i.e., smoking, drinking, sun exposure, genetics), while the longer-term fillers last about one to two years."
Chronic migraines are what were formerly known as “transformed” migraines. These are near daily headaches, sometimes with migraine features but otherwise with frequent features of tension headaches. This may sound trivial but the treatment for tension headaches, typically with analgesics, would only make this syndrome worse. We learned that treating these with migraine preventive medications proved mostly effective. The current International Classification of Headache Disorders defines chronic migraine as a recurrent headache that has been ongoing for the past 3 months, occurs on at least 15 days per month, lasts at least 4 hours per day, and has 8 or more days per month when the headache has features of a migraine or responds to a typical migraine medication.

Step therapy is largely unregulated both at the state and federal level, though individual states have started to pass legislation to limit step therapy and protect patients: 19 US states, including California, Mississippi, and Illinois, have laws that require insurance companies to grant certain exemptions or to review appeals from doctors within 72 hours so patients can get a waiver. But even then, getting a waiver isn’t always easy.
In clinical trials, 30.6% of patients (33/108) who were not using clean intermittent catheterization (CIC) prior to injection, required catheterization for urinary retention following treatment with BOTOX® 200 Units as compared to 6.7% of patients (7/104) treated with placebo. The median duration of postinjection catheterization for these patients treated with BOTOX® 200 Units (n = 33) was 289 days (minimum 1 day to maximum 530 days) as compared to a median duration of 358 days (minimum 2 days to maximum 379 days) for patients receiving placebo (n = 7).
Allergan has a deep commitment to the health and well-being of patients who use our products and the global communities where we operate. We are focused on access to our medicines, as well as environmental, health and sustainability initiatives. In 2016, Allergan introduced Our Social Contract with Patients, focused on four areas – Invest & Innovate, Access & Pricing, Quality & Safety, and Education -- where Allergan is committed to doing what is right for patients and society
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]
Ptosis generally occurs from injecting the frontalis incorrectly. The worst mistake is for the injector to move the procerus and corrugator injection points higher, where they will place more onabotulinumtoxinA into the frontalis. It is important to examine patients to determine their preexisting conditions prior to treatment administration. In particular, patients should be examined for pre-existing eyelid ptosis or pseudoptosis. With pseudoptosis, the lid strength is normal, but soft tissue covers part of the upper lid. With lid ptosis, the lid strength is weak. For both lid ptosis and pseudoptosis, patients will have frontalis compensatory activity, resulting in upgoing eyebrows (reverse Babinski sign). With brow ptosis, the frontalis is weak, and the eyebrow is depressed downward leading to tissue resting on the upper lid. To avoid this, the frontalis should be injected in the upper third of the forehead. The corrugator muscle attaches to bone at the medial end of the superciliary arch. The muscle fibers travel laterally and upward inserting into the skin in the middle of the supraorbital margin. The corrugator muscle is partially blended with the orbicularis oculi and occipitofrontalis. The supraorbital and supratrochlear nerves pass through the corrugator muscle. The corrugator muscle acts to pull the eyebrows downward and medially, which causes vertical wrinkle lines in the skin between the brows.
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]

The only difference between the two procedures is that with Botox for migraines, they may do a few more shots in areas where the pain is experienced. Personally, I usually get between 30 and 40 shots, concentrated mostly on the right side of my head where the pain occurs, at the base of my skull, and on my neck and shoulders, where I tend to hold tension, as doing so can cause a migraine. Botox for migraines can have the same aesthetic effect that cosmetic Botox has, which kills two birds with one stone for people who may desire that effect. "We do it along wrinkle lines and keep it symmetrical," says Ravitz, which explains the erasing of lines and temporary plumping of wrinkles.


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Properly trained, board-certified dermatologists and plastic surgeons separate the "forehead" area into the upper/main forehead, and the glabella, the area between the eyebrows that has the frown lines. Depending on your exact anatomy and types of lines and facial movement, you may need only 3 to 5 units total in the upper forehead area, or up to 40 units for the combined glabella... READ MORE
Jump up ^ Arnon SS, Schechter R, Inglesby TV, Henderson DA, Bartlett JG, Ascher MS, Eitzen E, Fine AD, Hauer J, Layton M, Lillibridge S, Osterholm MT, O'Toole T, Parker G, Perl TM, Russell PK, Swerdlow DL, Tonat K (February 2001). "Botulinum toxin as a biological weapon: medical and public health management". JAMA. 285 (8): 1059–70. doi:10.1001/jama.285.8.1059. PMID 11209178.
Now Allergan hopes to replicate the findings on a larger scale, and the company is currently running its own Phase 2 clinical trial. If its results are in line with Rosenthal and Finzi's, it would be huge, paving the way for Botox to obtain official approval for the drug as a depression treatment. That wouldn't change anything for doctors, of course--they can already prescribe it off-label, and some do, with great results--but it would allow Allergan to begin marketing Botox for depression, a change that could dramatically increase its adoption and sales.
If you experience migraine symptoms on 15 or more days each month, you have chronic migraines. Over-the-counter or prescription medications may help ease some of your symptoms, but some patients don’t respond well to pain relievers. In some cases, your doctor may prescribe preventive medicines, which are designed to reduce the frequency and severity of your symptoms. According to research published in the journal Neurology, only about one-third of patients with chronic migraines take preventive medicines.

Richard Clark, a plastic surgeon from Sacramento (CA), was the first to document a cosmetic use for botulinum toxin.[51] He treated forehead asymmetry caused by left sided forehead nerve paralysis that occurred during a cosmetic facelift. Since the injured nerve could possibly regenerate by 24 months, a two-year waiting period was necessary before definitive surgical treatment could be done. Clark realized that botulinum toxin, which had been previously used only for cross eyed babies and facial tics, could also be injected to smooth the wrinkles of the right forehead to match her paralyzed left. He received FDA approval for this cosmetic application of the toxin and successfully treated the person and published the case study in 1989.[51]


Now, thanks in large part to off-label use, Botox--the wrinkle smoother that exploded as a cultural phenomenon and medical triumph--is increasingly being drafted for problems that go far beyond the cosmetic. The depression suffered by Rosenthal's patient is just one example on a list that includes everything from excessive sweating and neck spasms to leaky bladders, premature ejaculation, migraines, cold hands and even the dangerous cardiac condition of atrial fibrillation after heart surgery, among others. The range of conditions for which doctors are now using Botox is dizzying, reflecting the drug's unique characteristics as much as the drug industry's unique strategies for creating a blockbuster.
In rare cases, Botox toxin can spread to areas beyond the injection site. If this happens, you may experience muscle weakness, vision changes, difficulty swallowing, and drooping eyelids. To reduce your risk of serious side effects and complications, always make sure Botox is prescribed and administered by a trained healthcare professional who has experience in using Botox.

BOTOX® Cosmetic targets one of the underlying causes of frown lines, crow’s feet and forehead lines — the repeated muscle contractions from frowning, squinting, smiling and raising the eyebrows over the years. Your specialist will inject these muscles with BOTOX® Cosmetic to temporarily reduce muscle activity. You will begin to notice a visible smoothing of the frown lines between your brows, your crow’s feet lines and your forehead lines.
Botox lasts only around three months (or more when you first start getting injections), so get ready to go in for maintenance every three to six months. Because it’s only meant to temporarily relax your muscles, it wears off over time, and you’ll notice your wrinkle start to appear again. “As skin ages, the skin loses elasticity and collagen breaks down, so constant muscle and skin contraction can create more permanent creases (wrinkles). Within a few months of injecting the botox, the body makes new acetylcholine receptors, and the nerves are able to conduct their impulses again,” Dr. Shainhouse explains. “You must use neurotoxins continuously in order to reduce muscle movement and prevent long-term skin creasing.” Find out more secrets from dermatologists about how to prevent and treat wrinkles.
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.
Jump up ^ Arnon SS, Schechter R, Inglesby TV, Henderson DA, Bartlett JG, Ascher MS, Eitzen E, Fine AD, Hauer J, Layton M, Lillibridge S, Osterholm MT, O'Toole T, Parker G, Perl TM, Russell PK, Swerdlow DL, Tonat K (February 2001). "Botulinum toxin as a biological weapon: medical and public health management". JAMA. 285 (8): 1059–70. doi:10.1001/jama.285.8.1059. PMID 11209178.
Risks are very minor with this procedure. The main risks consist of headache, pain, and flu-like illness. In rare cases, there may be a drooping lid or eyebrow area. It is important for the cosmetic surgeon to assess the patient's lids before injecting because the patient may not be a good candidate if he or she has an extremely droopy lid to begin with or one that is held up by constantly arching the lids. Ptosis (a severe drooping of the eyelid) can occur in up to 5% of patients but is very rare if the cosmetic surgeon does this procedure often. These complications are typically very minor occurrences and resolve with time.
Botox is an injectable drug made from a toxic bacterium called Clostridium botulinum. When you eat the toxin produced by this bacterium, it causes a life-threatening form of food poisoning, known as botulism. But when you inject it into your body, it causes different symptoms. It blocks certain chemical signals from your nerves, causing temporary paralysis of your muscles.
On July 7, 2015, the company acquired the rights to the late stage CGRP migraine portfolio of Merck & Co, as well as two experimental drugs (MK-1602 and MK-8031) for an upfront payment of $250 million.[12] On August 10, the company acquired Oculeve for $125 million.[13] On August 31, the company acquired Naurex for an upfront payment of $560 million.[14] On October 19, the company acquired AqueSys, developer of ocular implants that reduce intraocular pressure associated with glaucoma, for an initial payment of $300 million.[15] On October 1, the company acquired Kythera Biopharmaceuticals, a company focused on the medical aesthetics market, for $2.1 billion.[16] On November 4 the company announced the acquisition of Northwood Medical Innovation, developer of earFold, a medical device to correct protruding ears.[17] On November 25, 2015, the company announced it would partner with Rugen Therapeutic to develop new therapies for autism spectrum disorder, rabies and obsessive compulsive disorder.[18]
Laser tattoo removal has minimal side effects. Lasers break up the pigment of the tattoo with a high-intensity light beam. During the procedure, the patient wears protective eye shields and may be giving anesthesia. The pulse of the laser feels like the snapping of a rubber band against the skin. Possible side effects include a risk of infection, hypopigmentation, and hyperpigmentation.
The efficacy and safety of BOTOX for the treatment of primary axillary hyperhidrosis were evaluated in two randomized, multi center, double-blind, placebo-controlled studies. Study 1 included adult patients with persistent primary axillary hyperhidrosis who scored 3 or 4 on a Hyperhidrosis Disease Severity Scale (HDSS) and who produced at least 50 mg of sweat in each axilla at res t over 5 minutes. HDSS is a 4-point scale with 1 = “underarm sweating is never noticeable and never interferes with my daily activities”; to 4 = “underarm sweating is intolerable and always interferes with my daily activities”. A total of 322 patients were randomized in a 1:1:1 ratio to treatment in both axillae with either 50 Units of BOTOX, 75 Units of BOTOX, or placebo. Patients were evaluated at 4-week intervals. Patients who responded to the first injection were re-injected when they reported a re-increase in HDSS score to 3 or 4 and produced at least 50 mg sweat in each axilla by gravimetric measurement, but no sooner than 8 we eks after the initial injection.
BOTOX injections for migraines is a preventative treatment, rather than treating the condition with pain medication. It was FDA-approved in 2010 and is considered an appropriate treatment for adults who experience migraine headaches more than 15 days per month, for more than three months. The product blocks the release of certain brain chemicals, and it is believed that blocking these chemicals limits the nerve signals causing pain.

Laser tattoo removal has minimal side effects. Lasers break up the pigment of the tattoo with a high-intensity light beam. During the procedure, the patient wears protective eye shields and may be giving anesthesia. The pulse of the laser feels like the snapping of a rubber band against the skin. Possible side effects include a risk of infection, hypopigmentation, and hyperpigmentation.
It takes a village to raise a child. My family members are well aware of how I cope with migraine. They make themselves available to help my children and me often. I rely on people to drive me to doctor’s appointments as well as take my children to sports practices. I arrange carpools and am honest with the people in our lives about how a migraine attack can be unpredictable and suddenly change plans. Every year, I alert my children’s teachers of my chronic migraine and ask them to watch and listen for signs of migraine or stress in my children. I worry about them physically and emotionally and so far, they have handled my disease as they would any other illness. By being honest about the help I need, I find that the people in my life are better equipped to follow through. Many people would like to help but don’t know how. I have given up pride and allowed others to help, which inevitably takes stress away from us all.
Allergan Plc engages in the research, development, and manufacture of pharmaceutical products. It operates through the following business segments: US Specialized Therapeutics; US General Medicine, and International. The US Specialized Therapeutics segment includes sales and expenses relating to branded products within the United States. The US General Medicine segment involves Central Nervous System; Gastrointestinal; Women's Health; Anti-Infectives; and Diversified brands. The International segment comprises of products sold outside the United States. The company was founded on in 1984 and is headquartered in Dublin, Ireland.
The potency Units of BOTOX are specific to the preparation and assay method utilized. They are not interchangeable with other preparations of botulinum toxin products and, therefore, units of biological activity of BOTOX cannot be compared to nor converted into units of any other botulinum toxin products assessed with any other specific assay method [see DESCRIPTION].

With abnormal joint movement and inactivity, muscles can shorten and contract. In the case of muscle spasticity, the joint and soft tissue can be normal, but with constant contraction of a muscle because of spasticity the muscle can shorten. When it can no longer stretch to allow full range of motion, a contracture can happen. Agents that lessen the spasticity of the involved muscles best prevent this type of contracture.
Botox is so commonplace these days that you can get it done at some gyms and spas, but in these cases, you never know what you’re getting, how old the product is, with what it's mixed, and whether the injector knows what he or she is doing. Dr. Matarasso suggests only getting it done by what he calls the “core four”: a board-certified physician who is either a dermatologist, a plastic surgeon, an ear-nose-and-throat doctor, or an ophthalmologist.
If you have eyelid drooping after a Botox procedure, it is a good idea to let the cosmetic surgeon know because there is a medicine available to help this condition. Any other difficulties, such as difficulty breathing or rashes, should be reported to the surgeon immediately. Bruises are generally gone within one to two weeks, there are other medications available for the treatment of these, such as vitamin K topical treatments (Dr. Holmquist Healthcare CytoActive Post-Procedural Bruise Relief, Revision Skincare Vitamin K Serum, Clinicians Complex Bruise Cream, Glymed Plus Arnica+ Healing Cream).
As you noted in your question, the effects of Botox don't last forever. For some patients the short term effects of Botox are a ‘good thing,’ as it means that trying Botox is a relatively low risk/low commitment procedure. If you don't like your Botox results, there's not much to worry about: They will fade on their own in a few months. Generally speaking, the results last between three to five months -- but the duration of the Botox effect depends on the individual and on how many Botox units were used.
Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.

A double-blind, placebo-controlled study enrolled patients who had extended histories of receiving and tolerating BOTOX injections, with prior individualized adjustment of dose. The mean BOTOX dose administered to patients in this study was 236 Units (25th to 75th percentile range of 198 Units to 300 Units). The BOTOX dose was divided among the affected muscles [see Clinical Studies].
BOTOX injections for migraines is a preventative treatment, rather than treating the condition with pain medication. It was FDA-approved in 2010 and is considered an appropriate treatment for adults who experience migraine headaches more than 15 days per month, for more than three months. The product blocks the release of certain brain chemicals, and it is believed that blocking these chemicals limits the nerve signals causing pain.

But today it's the medical uses of the drug that are the great moneymaker, in part because doctors are getting a better handle on how to use it. Botulinum toxin type A is one of seven neurotoxins produced from Clostridium botulinum. Contracting botulism is bad news: it can cause blurred vision, persistent trouble swallowing and worse. In one recent case, close to 30 people were hospitalized in Ohio in 2015 after attending a church potluck. One person died. The outbreak was ultimately attributed to a potato salad made from improperly home-canned potatoes that were harboring the bacteria. Given its level of toxicity, some countries have even explored its potential use as a bioweapon.
Symptoms of overdose are likely not to be present immediately following injection. Should accidental injection or oral ingest ion occur or overdose be suspected, the person should be medically supervised for several weeks for signs and symptoms of systemic muscular weakness which could be local, or distant from the site of injection [see BOX WARNING and WARNINGS AND PRECAUTIONS]. These patients should be considered for further medical evaluation and appropriate medical therapy immediately instituted, which may include hospitalization.
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]
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