Jump up ^ Dodick DW, Turkel CC, DeGryse RE, Aurora SK, Silberstein SD, Lipton RB, Diener HC, Brin MF (June 2010). "OnabotulinumtoxinA for treatment of chronic migraine: pooled results from the double-blind, randomized, placebo-controlled phases of the PREEMPT clinical program". Headache. 50 (6): 921–36. doi:10.1111/j.1526-4610.2010.01678.x. PMID 20487038.
Keep in mind that the price is often reflective of experience and quality. Botox injections gone wrong can lead to a  "Botox face", a droopy eyelid, migraine headaches, and frozen facial expressions. Unskilled or inexperienced injectors may also cause excessive bruising and more asymmetric results. Experienced plastic surgeons and dermatologists who are good Botox injectors can be much more expensive than injectors with limited experience.
The recommended dilution is 200 Units/4 mL or 100 Units/2 mL, with a final concentration of 5 Units per 0.1 mL (see Table 1). The recommended dose for treating chronic migraine is 155 Units ad ministered intramuscularly using a sterile 30-gauge, 0.5 inch needle as 0.1 mL (5 Units) injections per each site. Injections should be divided across 7 specific head/neck muscle areas as specified in the diagrams and Table 2 below. A one inch needle may be needed in the neck region for patients with thick neck muscles. With the exception of the procerus muscle, which should be injected at one site (midline), all muscles should be injected bilaterally with half the number of injection sites administered to the left, and half to the right side of the head and neck. The recommended re-treatment schedule is every 12 weeks.
In many children, there are a few muscle groups that can have very active spasticity. A more focal approach to these muscles would be better than a widespread approach. In this case a doctor may advise a nerve block to interrupt the signal to the muscle that is spastic. Once the signal that is carried to the muscle by the nerve is interrupted, the spasticity will decrease.
That Groupon offer might be tempting, but Dr. Tutela recommends doing a thorough vetting of your practitioner’s history and methods before signing up for treatment. “I think it is important to ask any provider if they perform that procedure frequently, to gauge their experience,” he says. He also suggests to ask if they’ve experienced any major complications and to check their online reviews. “You can get a sense of how you will be treated and what kind of experience other patients have had,” Dr. Tutela says. “Many of those low-cost, high-volume practices are loaded with horrible reviews from disappointed patients.”
The most common severe adverse reaction associated with the use of BOTOX injection in patients with cervical dystonia is dysp hagia with about 20% of these cases also reporting dyspnea [see WARNINGS AND PRECAUTIONS]. Most dysphagia is reported as mild or moderate in severity. However, it may be associated with more severe signs and symptoms [see WARNINGS AND PRECAUTIONS].
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.