How Long Do Botox Treatments Last?  Before you begin you should know that effects of Botox last about three to four months. That’s all – when practitioners make claim that it lasts longer don’t believe them because it doesn’t. So when you factor in the cost of Botox or Dysport you should know that in order to maintain the beneficial effects of these injections you will probably repeat the treatment three to four times a year.
The FDA approved such usage in the late 1980s upon the discovery that Botox could stop ailments like blepharospasm (uncontrolled blinking) and strabismus (lazy eye). Doctors have been using Botox for years to successfully treat wrinkles and facial creases. In April 2002, Botox gained FDA approval for treatment of moderate-to-severe frown lines between the eyebrows - called glabellar lines. However, Botox is often used for other areas of the face as well.
The number of Botox varies from one area to another which has a direct effect on how much does Botox cost. For example, to remove crow’s feet, it requires at least 5 to 15 units per side while 10 to 30 units for the forehead lines. Therefore, each of the areas has a different volume of Botox necessary to correct the appearance which factors in the overall cost.
BOTOX® increases the incidence of urinary tract infection. Clinical trials for overactive bladder excluded patients with more than 2 UTIs in the past 6 months and those taking antibiotics chronically due to recurrent UTIs. Use of BOTOX® for the treatment of overactive bladder in such patients and in patients with multiple recurrent UTIs during treatment should only be considered when the benefit is likely to outweigh the potential risk.

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.
Strabismus is caused by imbalances in the actions of muscles that rotate the eyes, and can sometimes be relieved by weakening a muscle that pulls too strongly, or pulls against one that has been weakened by disease or trauma. Muscles weakened by toxin injection recover from paralysis after several months, so it might seem that injection would then need to be repeated. However, muscles adapt to the lengths at which they are chronically held,[18] so that if a paralyzed muscle is stretched by its antagonist, it grows longer, while the antagonist shortens, yielding a permanent effect. If there is good binocular vision, the brain mechanism of motor fusion, which aligns the eyes on a target visible to both, can stabilize the corrected alignment.
In patients who are not catheterizing, post-void residual (PVR) urine volume should be assessed within 2 weeks post treatment and periodically as medically appropriate up to 12 weeks, particularly in patients with multiple sclerosis or diabetes mellitus. Depending on patient symptoms, institute catheterization if PVR urine volume exceeds 200 mL and continue until PVR falls below 200 mL. Instruct patients to contact their physician if they experience difficulty in voiding as catheterization may be required.
Jump up ^ van Ermengem E (1979). "Classics in infectious diseases. A new anaerobic bacillus and its relation to botulism. E. van Ermengem. Originally published as "Ueber einen neuen anaëroben Bacillus und seine Beziehungen zum Botulismus" in Zeitschrift für Hygiene und Infektionskrankheiten 26: 1–56, 1897". Reviews of Infectious Diseases (in German). 1 (4): 701–19. PMID 399378. Original doi:10.1007/BF02220526
As of 2013, botulinum toxin injections are the most common cosmetic operation, with 6.3 million procedures in the United States, according to the American Society of Plastic Surgeons. Qualifications for Botox injectors vary by county, state and country. Botox cosmetic providers include dermatologists, plastic surgeons, aesthetic spa physicians, dentists, nurse practitioners, nurses and physician assistants.
Allergan plc, incorporated on May 16, 2013, is a specialty pharmaceutical company. The Company is engaged in the development, manufacturing, marketing and distribution of brand name pharmaceutical products, medical aesthetics, biosimilar and over-the-counter (OTC) pharmaceutical products. The Company operates through three segments: US Specialized Therapeutics, US General Medicine and International. The US Specialized Therapeutics segment includes sales relating to branded products within the United States, including Medical Aesthetics, Medical Dermatology, Eye Care, Neurosciences and Urology therapeutic products. The US General Medicine segment includes sales relating to branded products within the United States that do not fall into the US Specialized Therapeutics business units, including Central Nervous System, Gastrointestinal, Women's Health, Anti-Infectives and Diversified Brands. The International segment includes sales relating to products sold outside the United States. Within its US Specialized Therapeutics, US General Medicine and International operations, the Company sells its brand and aesthetic pharmaceutical products primarily to drug wholesalers, retailers and distributors, including national retail drug and food store chains, hospitals, clinics, mail-order retailers, government agencies and managed healthcare providers, such as health maintenance organizations and other institutions.
BOTOX was evaluated in two randomized, multi-center, 24-week, 2 injection cycle, placebo-controlled double-blind studies. Study 1 and Study 2 included chronic migraine adults who were not using any concurrent headache prophylaxis, and during a 28 -day baseline period had ≥15 headache days lasting 4 hours or more, with ≥50% being migraine/probable migraine. In both studies, patients were randomized to receive placebo or 155 Units to 195 Units BOTOX injections every 12 weeks for the 2-cycle, double-blind phase. Patients were allowed to use acute headache treatments during the study. BOTOX treatment demonstrated statistically significa nt and clinically meaningful improvements from baseline compared to placebo for key efficacy variables (see Table 24).

I usually keep my patients on migraine preventative medications until we have seen sufficient relief of migraine to warrant a taper to a lower dose or even an attempt at medication discontinuation. Patients are free to use their typical migraine abortive medications for breakthrough migraines. There are some patients that find that they still require their other anti-migraine medications for full migraine control.
Do not receive BOTOX® Cosmetic if you: are allergic to any of the ingredients in BOTOX® Cosmetic (see Medication Guide for ingredients); had an allergic reaction to any other botulinum toxin product such as Myobloc® (rimabotulinumtoxinB), Dysport® (abobotulinumtoxinA), or Xeomin® (incobotulinumtoxinA); have a skin infection at the planned injection site.
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