The number of headache days determines whether the patient has episodic migraine (EM) (14 or fewer headache days a month) or CM (more than 15 days of headache a month). The best method of determining the actual number of headache days is to subtract this from the number of completely headache-free days in a month. If headache is present on more than half the days in the month, and there are migraine features on at least 8 days a month, the condition is termed CM. The migraine features only have to be present on 8 days out of the month and not on every headache day. The other headache days in this condition are considered to be milder forms of migraine, and they do not have all the typical migraine features. If headache is present on fewer than 15 days a month, this is referred to as EM. EM can transform to CM over time. If analgesics are used on 10 or more days per month, this can lead to a transformation to CM. The patient’s headache pattern over a 12-month period should be determined, and during this time, there should be at least 3 months with 15 headache days; 8 of these days should meet migraine criteria.1-3

There have been reports following administration of BOTOX® of adverse events involving the cardiovascular system, including arrhythmia and myocardial infarction, some with fatal outcomes. Some of these patients had risk factors including pre-existing cardiovascular disease. Use caution when administering to patients with pre-existing cardiovascular disease.

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).

The most common side effects of Botox injections are neck pain and stiffness at the injection site. You may develop a headache afterward. You may also experience temporary muscle weakness in your neck and upper shoulders. This can make it hard to keep your head upright. When these side effects occur, they usually resolve on their own within a few days.
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.
Patients should shave underarms and abstain from use of over-the-counter deodorants or antiperspirants for 24 hours prior to the test. Patient should be resting comfortably without exercise, hot drinks for approximately 30 minutes prior to the test. Dry the underarm area and then immediately paint it with iodine solution. Allow the area to dry, then lightly sprinkle the area with starch powder. Gently blow off any excess starch powder. The hyperhidrotic area will develop a deep blue-black color over approximately 10 minutes.
In response to the occurrence of these side effects, in 2008 the U.S. Food and Drug Administration notified the public of the potential dangers of the botulinum toxin as a therapeutic. Namely, they warned that the toxin can spread to areas distant from the site of injection and paralyze unintended muscle groups, especially when used for treating muscle spasticity in children treated for cerebral palsy.[28] In 2009, the FDA announced that boxed warnings would be added to available botulinum toxin products, warning of their ability to spread from the injection site.[29] Additionally, the FDA announced name changes to several botulinum toxin products, meant to emphasize that the products are not interchangeable and require different doses for proper use. Botox and Botox Cosmetic were renamed onabotulinumtoxinA, Myobloc was renamed rimabotulinumtoxinB, and Dysport name renamed abobotulinumtoxinA.[29] In conjunction with this, the FDA issued a communication to health care professionals reiterating the new drug names and the approved uses for each.[30] A similar warning was issued by Health Canada in 2009, warning that botulinum toxin products can spread to other parts of the body.[31]
Most people tolerate the injection discomfort well. But you may want your skin to be numbed beforehand, especially if your palms or soles are being treated for excessive sweating. Your doctor might use one or more of various methods available to numb the area, such as topical anesthesia, ice and vibration anesthesia, which uses massage to reduce discomfort.

If the musculature of the oropharynx and esophagus are affected, aspiration may occur which may lead to development of aspira tion pneumonia. If the respiratory muscles become paralyzed or sufficiently weakened, intubation and assisted respiration may be necessary until recovery takes place. Supportive care could involve the need for a tracheostomy and/or prolonged mechanical ventilation, in addition to other general supportive care.
When BOTOX was administered intramuscularly to pregnant rats (0.125, 0.25, 0.5, 1, 4, or 8 Units/kg) or rabbits (0.063, 0.125 , 0.25, or 0.5 Units/kg) daily during the period of organogenesis (total of 12 doses in rats, 13 doses in rabbits), reduced fetal body weights and decreased fetal skeletal ossification were observed at the two highest doses in rats and at the highest dose in rabbit s. These doses were also associated with significant maternal toxicity, including abortions, early deliveries, and maternal death. The developmen tal no-effect doses in these studies of 1 Unit/kg in rats and 0.25 Units/kg in rabbits are less than the human dose of 400 Units, based on Units/kg.

A recent encounter with one of my headache patients got me thinking. I am treating this young woman for chronic migraine with BOTOX injections. She told me that one of her other physicians had been surprised to hear about this use for onabotulinumtoxin A. According to my patient, the gastroenterologist’s words were, “BOTOX for migraines? I’ve never heard of that.” 
In a study to evaluate inadvertent peribladder administration, bladder stones were observed in 1 of 4 mal e monkeys that were injected with a total of 6.8 Units/kg divided into the prostatic urethra and proximal rectum (single administration). No bladder stones were observed in male or female monkeys following injection of up to 36 Units/kg (~12X the highest human bladder dose) directly to the bladder as either single or 4 repeat dose injections or in female rats for single injections up to 100 Units/kg (~33X the highest human bladder dose).

Serious and/or immediate hypersensitivity reactions have been reported. These reactions include anaphylaxis, serum sickness, urticaria, soft-tissue edema, and dyspnea. If such reactions occur, further injection of BOTOX® Cosmetic should be discontinued and appropriate medical therapy immediately instituted. One fatal case of anaphylaxis has been reported in which lidocaine was used as the diluent and, consequently, the causal agent cannot be reliably determined.
The frontalis muscle attaches to the skin of the lower forehead and ascends to join the fronto-occipital aponeurosis. The action of the frontalis muscle involves elevation of the eyebrows to produce expressions such as surprise, and can cause deep transverse wrinkles on the forehead. The antagonists for brow depression are the corrugators, procerus, and orbicularis oculi muscles.
Study responders were defined as patients who showed at least a 2-grade improvement from baseline value on the HDSS 4 weeks after both of the first two treatment sessions or had a sustained response after their first treatment session and did not receive re-treatment during the study. Spontaneous resting axillary sweat production was assessed by weighing a filter paper held in the axilla ov er a period of 5 minutes (gravimetric measurement). Sweat production responders were those patients who demonstrated a reduction in axillary sweating from baseline of at least 50% at week 4.
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, trouble swallowing.
This product contains albumin, a derivative of human blood. Based on effective donor screening and product manufacturing processes, it carries an extremely remote risk for transmission of viral diseases and variant Creutzfeldt-Jakob disease (vCJD). There is a theoretical risk for transmission of Creutzfeldt-Jakob disease (CJD), but if that risk actually exists, the risk of transmission would also be considered extremely remote. No cases of transmission of viral diseases, CJD or vCJD have ever been identified for licensed albumin or albumin contained in other licensed products.
Bronchitis was reported more frequently as an adverse reaction in patients treated for upper limb spasticity with BOTOX® (3% at 251 Units to 360 Units total dose) compared to placebo (1%). In patients with reduced lung function treated for upper limb spasticity, upper respiratory tract infections were also reported more frequently as adverse reactions in patients treated with BOTOX® (11% at 360 Units total dose; 8% at 240 Units total dose) compared to placebo (6%). In adult patients treated for lower limb spasticity, upper respiratory tract infections were reported more frequently as an adverse event in patients treated with BOTOX® (2% at 300 Units to 400 Units total dose), compared to placebo (1%).
Botox often gets a bad rep for leaving patients looking a little frozen, but that's the fault of bad technique, not necessarily the procedure itself, explains Day. "In many places where it's not a trained aesthetic physician doing the injection, it's really just inject by number," she says. The problem with this is that no two faces, or even two sides of a face, are the same. "That cookie cutter, one-size-fits-all approach is what often gives these treatments a bad name," says Day.
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The safety and efficacy of onabotulinumtoxinA for CM was demonstrated in the pivotal phase III Research Evaluating Migraine Prophylaxis Therapy (PREEMPT) trial. In this trial, patients were treated every 12 weeks whether or not their headaches had returned to baseline levels and the primary outcome period was after two treatment cycles. At baseline, these patients had more than 19 headache days, and after two treatment cycles, their headaches had been reduced by 8 to 9 days per 28 days. The responder rate analysis of the study population shows that about 25% of patients improved by 75% in terms of a reduction of migraine days. In my practice, I usually do three cycles 12 weeks apart, and only if there is no change in headache frequency after this, do I change treatments. In the pivotal trials, the first statistical separation from placebo occurred in the first 4 weeks. There is a small subgroup of patients who fail to respond to the first two treatments and only start to respond after the third treatment.4-10

Botulinum toxin exerts its effect by cleaving key proteins required for nerve activation. First, the toxin binds specifically to nerves which use the neurotransmitter acetylcholine. Once bound to the nerve terminal, the neuron takes up the toxin into a vesicle. As the vesicle moves farther into the cell, it acidifies, activating a portion of the toxin which triggers it to push across the vesicle membrane and into the cell cytoplasm.[1] Once inside the cytoplasm, the toxin cleaves SNARE proteins preventing the cell from releasing vesicles of neurotransmitter. This stops nerve signaling, leading to paralysis.[1]
The following adverse reactions with BOTOX 200 Units were reported at any time following initial injection and prior to re -injection or study exit (median duration of exposure was 44 weeks): urinary tract infections (49%), urinary retention (17%), constipation (4%), muscular weakness (4%), dysuria (4%), fall (3%), gait disturbance (3%), and muscle spasm (2%).

In 1950, pharmacist Gavin S. Herbert established Allergan Pharmaceuticals, Inc. Allergan focused on the discovery and development of novel formulations for specialty markets, as well as intimate collaboration with physicians and the scientific community. In 1953, Allergan produced eye drops and formulated new products such as the first cortisone eye drop to treat allergic inflammation and the first ophthalmic steroid decongestant.
Other side effects of BOTOX® and BOTOX® Cosmetic include: dry mouth, discomfort or pain at injection site, tiredness, headache, neck pain, eye problems: double vision, blurred vision, decreased eyesight, drooping eyelids, swelling of eyelids, dry eyes, and drooping eyebrows. In people being treated for urinary incontinence other side effects include: urinary tract infection, painful urination, and/or inability to empty your bladder on your own. If you have difficulty fully emptying your bladder after receiving BOTOX®, you may need to use disposable self-catheters to empty your bladder up to a few times each day until your bladder is able to start emptying again.