As with all therapeutic proteins, there is a potential for immunogenicity. The detection of antibody formation is highly dependent on the sensitivity and specificity of the assay. Additionally, the observed incidence of antibody (including neutralizing antibo dy) positivity in an assay may be influenced by several factors including assay methodology, sample handling, timing of sample collection, concomitant medications, and underlying disease. For these reasons, comparison of the incidence of antibodies to onabotulinumtoxinA in the studies described below with the incidence of antibodies in other studies or to other products may be misleading.
Scientists at the University of Granada have confirmed that injecting a local anesthetic or botulinum toxin (botox) into certain points named "trigger points" of the pericraneal and neck muscles reduce migraine frequency among migraine sufferers. University of Granada researchers have identified the location of these trigger points -which activation results in migraine- and their relationship with the duration and severity of this condition.
It may be necessary for the patient to have additional procedures, such as the use of filler substances (for example, Restylane, Perlane, Juvederm, Sculptra, or Radiesse) in order to plump up the wrinkles that are now relaxed. Additionally, it may be necessary to have two or three sessions of Botox treatment for deeper wrinkles before results become optimal. The area of the crease between the eyes is a particularly ideal area for Botox use in conjunction with filler as these fixed wrinkles don't always respond optimally to Botox alone. There is some controversy about using filler in that area as it may block veins or arteries and result in loss of blood and a scar to the area. Generally, the smaller particle fillers, such as Restylane or Juvederm Ultra, are best in the area between the eyes for this reason.

I would caution against shopping around for cheap Botox. There are practitioners than offer bargain prices that are not sustainable from a business standpoint. They may be diluting their Botox or injecting less units than advertised.  Also, some practitioners charge less per unit of Botox but inject significantly more Botox than is required to achieve the optimal outcome. For instance, 60 units of Botox at $10/unit is more expensive than 45 well placed units at $12/unit. 

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.
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.
Wrinkles, whether they be fine line or deep furrows, typically appear on areas of the body that receive a high amount of exposure to the sun. Smoking, light skin type, hairstyle, the way you dress, your occupational and recreational habits, and heredity are all factors that promote wrinkling. Medical treatments for wrinkles include antioxidants, moisturizers, alpha-hydroxy acids, and vitamin A acid. Cosmetic procedures that treat wrinkles include dermabrasion, microdermabrasion, glycolic acid peels, laser resurfacing, Botox, and fillers.

Other than that, there don’t seem to be any specific groups of people or health conditions that are contraindicated for Botox injections. As with all treatments, general health guidelines apply. People with a healthy body-mass index who are non-smokers, moderate or non-drinkers, and physically active will nearly always tolerate any type of medical treatment well.
Individuals with peripheral motor neuropathic diseases, amyotrophic lateral sclerosis or neuromuscular junction disorders (e. g., myasthenia gravis or Lambert-Eaton syndrome) should be monitored when given botulinum toxin. Patients with neuromuscular disorders may be at increased risk of clinically significant effects including generalized muscle weakness, diplopia, ptosis, dysphonia, dysarthria, severe dysphagia and respiratory compromise from therapeutic doses of BOTOX [see Dysphagia And Breathing Difficulties].
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 post-injection 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).
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